{"id":4123,"date":"2026-07-09T11:32:18","date_gmt":"2026-07-09T08:32:18","guid":{"rendered":"https:\/\/autopark-service.com.ua\/?p=4123"},"modified":"2026-07-29T11:41:08","modified_gmt":"2026-07-29T08:41:08","slug":"dvygun-peregrivayetsya-osnovni-prychyny-shho-robyty-vodiyevi","status":"publish","type":"post","link":"https:\/\/autopark-service.com.ua\/en\/dvygun-peregrivayetsya-osnovni-prychyny-shho-robyty-vodiyevi\/","title":{"rendered":"Engine Overheating: Main Causes and What the Driver Should Do"},"content":{"rendered":"<p>Engine overheating is a dangerous fault that may cause deformation of the cylinder head, damage to the cylinder head gasket, engine seizure, and costly repairs. If the temperature gauge reaches the red zone, a warning appears on the dashboard, or steam comes from under the bonnet, you should not continue driving as normal.<\/p>\n<p>The cause may be a low coolant level or a faulty thermostat, fan, water pump, or radiator. To avoid serious consequences, it is important to stop the vehicle correctly and have the cooling system diagnosed. In Lviv, you can have your vehicle checked and repaired at the \u00abAutopark-Service\u00bb service station in Solonka.<\/p>\n<h2>How to Tell That the Engine Is Overheating<\/h2>\n<p>The following signs may indicate that the engine temperature is rising:<\/p>\n<ul>\n<li>the temperature gauge is approaching the red zone;<\/li>\n<li>the red temperature warning light has come on;<\/li>\n<li>an overheating message has appeared on the dashboard;<\/li>\n<li>steam is coming from under the bonnet;<\/li>\n<li>there is a sweet smell of antifreeze;<\/li>\n<li>engine power has decreased;<\/li>\n<li>the cabin heater has stopped blowing warm air;<\/li>\n<li>the radiator fan runs continuously or does not switch on;<\/li>\n<li>traces of coolant have appeared under the vehicle.<\/li>\n<\/ul>\n<p>Some vehicles do not have a separate temperature gauge. In this case, the driver only sees a warning indicator, which should not be ignored even if there is no steam or unusual noise.<\/p>\n<h2>Why a Car Engine Overheats<\/h2>\n<p>Low coolant level. Antifreeze carries heat away from the engine and transfers it to the radiator. If there is not enough fluid, the system cannot cool the engine properly.<\/p>\n<p><strong>The level may decrease because of:<\/strong><\/p>\n<ul>\n<li>damaged hoses;<\/li>\n<li>leaking connections;<\/li>\n<li>cracks in the expansion tank;<\/li>\n<li>a leaking radiator;<\/li>\n<li>a faulty water pump;<\/li>\n<li>a leak from the heater core;<\/li>\n<li>damage to the cylinder head gasket.<\/li>\n<\/ul>\n<p>Simply topping up the antifreeze will not solve the problem if the system is still leaking. The source of the coolant loss must be found and the system must be made leak-tight again.<\/p>\n<p>Faulty thermostat. The thermostat regulates the flow of antifreeze between the engine and the radiator. While the engine is cold, the fluid circulates through the small circuit. Once the engine warms up, the thermostat opens the large circuit.<\/p>\n<p>If the valve is stuck in the closed position, the antifreeze cannot reach the radiator, causing the temperature to rise quickly. This is especially noticeable when driving under load or at high engine speeds.<\/p>\n<p>Radiator fan not working. The fan creates additional airflow through the radiator when the vehicle is stationary in traffic or moving slowly. If it does not switch on, the engine may overheat in the city but operate normally on the motorway.<\/p>\n<p><strong>Possible causes include:<\/strong><\/p>\n<ul>\n<li>a faulty fan motor;<\/li>\n<li>a blown fuse;<\/li>\n<li>a damaged relay;<\/li>\n<li>a faulty temperature sensor;<\/li>\n<li>broken wiring;<\/li>\n<li>a problem with the control unit.<\/li>\n<\/ul>\n<p>If the temperature rises mainly in Lviv traffic jams, at traffic lights, or while driving slowly, the fan should be one of the first components to be checked.<\/p>\n<p>Water pump failure. The water pump circulates the coolant. If the impeller, bearing, or drive is damaged, the antifreeze will no longer circulate properly through the system.<\/p>\n<p><strong>Signs of a faulty water pump may include:<\/strong><\/p>\n<ul>\n<li>traces of antifreeze near the pump;<\/li>\n<li>unusual noise from the drive side;<\/li>\n<li>play in the pulley;<\/li>\n<li>a rapid rise in temperature;<\/li>\n<li>poor cabin heater performance;<\/li>\n<li>unstable temperature while driving.<\/li>\n<\/ul>\n<p>On some engines, the water pump is driven by the timing belt. If the pump seizes, it may damage the belt and cause a serious engine failure.<\/p>\n<p>Dirty or damaged radiator. The radiator may become contaminated externally with dust, insects, leaves, and road dirt. Deposits may also accumulate inside its channels, especially if low-quality antifreeze or ordinary water has been used.<\/p>\n<p>If the radiator has insufficient flow capacity, it cannot dissipate heat effectively. The problem often becomes noticeable in warm weather, during prolonged driving, or when the air conditioning is switched on.<\/p>\n<p>Air lock in the cooling system. Air may remain in the system after replacing the antifreeze or repairing the hoses, radiator, or water pump. It disrupts coolant circulation and creates local overheating zones.<\/p>\n<p><strong>Signs of an air lock may include:<\/strong><\/p>\n<ul>\n<li>unstable engine temperature;<\/li>\n<li>cold air from the cabin heater;<\/li>\n<li>bubbles in the expansion tank;<\/li>\n<li>a sudden change in the antifreeze level;<\/li>\n<li>overheating after a recent cooling system repair.<\/li>\n<\/ul>\n<p>To remove the air, the system must be filled and bled correctly in accordance with the vehicle\u2019s design.<\/p>\n<p>Faulty expansion tank cap. The cap maintains the required pressure in the cooling system. If its valve does not work, the antifreeze may boil earlier, leak through the tank, or fail to return to the system after cooling.<\/p>\n<p>The cap costs considerably less than most cooling system components, but it should not be replaced at random. The system\u2019s tightness and operating pressure should be checked first.<\/p>\n<p>Cylinder head gasket problem. Damage to the cylinder head gasket may allow exhaust gases to enter the cooling system or antifreeze to enter the cylinders and engine oil.<\/p>\n<p><strong>Possible signs include:<\/strong><\/p>\n<ul>\n<li>constant bubbles in the expansion tank;<\/li>\n<li>antifreeze being forced out;<\/li>\n<li>white smoke from the exhaust pipe;<\/li>\n<li>emulsion under the oil filler cap;<\/li>\n<li>a rapid increase in pressure inside the hoses;<\/li>\n<li>a falling coolant level without a visible leak;<\/li>\n<li>repeated overheating after replacing the thermostat or water pump.<\/li>\n<\/ul>\n<p>This is a serious fault that requires comprehensive engine diagnostics.<\/p>\n<p>Faulty temperature sensor. Sometimes the engine is not actually overheating, and the incorrect readings are caused by a faulty sensor, wiring, or instrument panel. However, assuming this without diagnostics is dangerous.<\/p>\n<p>The sensor readings should be compared with the actual engine temperature and the data received by the electronic control unit.<\/p>\n<p>Low engine oil level. Engine oil not only reduces friction but also helps carry heat away from engine components. If the level is critically low, the temperature may rise and engine wear may accelerate.<\/p>\n<p>The oil level should be checked on a level surface after switching off the engine and waiting briefly. If the oil pressure warning light is also on, the engine must not be started and the vehicle must not be driven.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-4126\" src=\"http:\/\/autopark-service.com.ua\/wp-content\/uploads\/2026\/07\/dvygun-peregrivayetsya-osnovni-prychyni-3.webp\" alt=\"\u0429\u043e \u0440\u043e\u0431\u0438\u0442\u0438 \u043f\u0440\u0438 \u043f\u0435\u0440\u0435\u0433\u0440\u0456\u0432\u0456 \u0434\u0432\u0438\u0433\u0443\u043d\u0430 \u2014 \u0430\u0432\u0442\u043e\u043c\u043e\u0431\u0456\u043b\u044c \u0456\u0437 \u043f\u0430\u0440\u043e\u044e \u0437-\u043f\u0456\u0434 \u043a\u0430\u043f\u043e\u0442\u0430\" width=\"1200\" height=\"900\" srcset=\"https:\/\/autopark-service.com.ua\/wp-content\/uploads\/2026\/07\/dvygun-peregrivayetsya-osnovni-prychyni-3.webp 1200w, https:\/\/autopark-service.com.ua\/wp-content\/uploads\/2026\/07\/dvygun-peregrivayetsya-osnovni-prychyni-3-300x225.webp 300w, https:\/\/autopark-service.com.ua\/wp-content\/uploads\/2026\/07\/dvygun-peregrivayetsya-osnovni-prychyni-3-1024x768.webp 1024w, https:\/\/autopark-service.com.ua\/wp-content\/uploads\/2026\/07\/dvygun-peregrivayetsya-osnovni-prychyni-3-768x576.webp 768w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><\/p>\n<h2>What to Do If the Engine Starts Overheating<\/h2>\n<p><strong>Reduce the load<\/strong><\/p>\n<p>Switch off the air conditioning, gradually reduce your speed, and monitor the temperature gauge. Do not accelerate or continue driving at high engine speeds.<\/p>\n<p><strong>Switch on the cabin heater<\/strong><\/p>\n<p>As a temporary measure, you can set the heater to its maximum temperature and use a high fan speed. The heater core will help remove some of the heat.<\/p>\n<p>This method should only be used to move safely off the road. It does not eliminate the fault and does not allow you to continue a long journey.<\/p>\n<p><strong>Stop safely<\/strong><\/p>\n<p>Stop the vehicle in a safe place and switch off the engine. If steam is coming from under the bonnet, do not lean over the engine compartment or attempt to inspect the expansion tank immediately.<\/p>\n<p><strong>Allow the engine to cool<\/strong><\/p>\n<p>Wait until the temperature has fallen. Do not open the expansion tank or radiator cap while the engine is hot. The system is pressurised, and hot antifreeze may cause burns.<\/p>\n<p><strong>Inspect the vehicle after it has cooled<\/strong><\/p>\n<p>Once the engine has cooled, you can check:<\/p>\n<ul>\n<li>the antifreeze level;<\/li>\n<li>whether there are any visible leaks;<\/li>\n<li>the condition of the hoses;<\/li>\n<li>traces of fluid under the vehicle;<\/li>\n<li>the condition of the drive belt;<\/li>\n<li>whether the expansion tank is damaged.<\/li>\n<\/ul>\n<p>Do not touch hot components or restart the engine if there is a significant leak or visible belt damage.<\/p>\n<h2>What You Must Not Do When the Engine Overheats<\/h2>\n<p>When the temperature rises, you should not:<\/p>\n<ul>\n<li>open the expansion tank cap while the engine is hot;<\/li>\n<li>pour cold water over the engine;<\/li>\n<li>suddenly add cold fluid to an overheated system;<\/li>\n<li>continue driving with the temperature in the red zone;<\/li>\n<li>ignore a repeated rise in temperature;<\/li>\n<li>use sealants as a permanent repair method;<\/li>\n<li>clear the error without identifying its cause.<\/li>\n<\/ul>\n<p>A sudden temperature change may deform metal components. Prolonged driving with an overheated engine often turns a relatively simple cooling system repair into a complete engine overhaul.<\/p>\n<h2>Can You Continue Driving After the Engine Has Overheated?<\/h2>\n<p>You should only continue driving in an exceptional situation when the temperature has fully returned to normal, there is no leak, the antifreeze level is sufficient, and only a minimal distance remains to the service station. Even then, the temperature must be monitored continuously and engine load should be avoided.<\/p>\n<p><strong>Do not continue driving if:<\/strong><\/p>\n<ul>\n<li>steam is coming from under the bonnet;<\/li>\n<li>antifreeze is leaking;<\/li>\n<li>the temperature rises again;<\/li>\n<li>the engine is running unevenly;<\/li>\n<li>white smoke has appeared;<\/li>\n<li>the oil pressure warning light is on;<\/li>\n<li>knocking or other unusual noises can be heard;<\/li>\n<li>there is no fluid in the expansion tank;<\/li>\n<li>the drive belt is damaged.<\/li>\n<\/ul>\n<p>In these cases, it is safer to use a recovery vehicle and have the car transported to a service station.<\/p>\n<h2>Why the Engine Overheats in Traffic but Not on the Motorway<\/h2>\n<p>If the temperature rises while driving slowly but returns to normal at higher speed, the problem is most often related to the radiator fan or insufficient airflow.<\/p>\n<p><strong>The following should be checked:<\/strong><\/p>\n<ul>\n<li>the fan;<\/li>\n<li>the relays and fuses;<\/li>\n<li>the temperature sensor;<\/li>\n<li>the wiring;<\/li>\n<li>the cleanliness of the radiator;<\/li>\n<li>the operation of the air conditioning system and its fan.<\/li>\n<\/ul>\n<p>This symptom is especially noticeable in urban traffic in Lviv, where vehicles may remain in traffic jams for a long time.<\/p>\n<h2>Why the Engine Overheats on the Motorway<\/h2>\n<p>Overheating while driving at speed may indicate other problems:<\/p>\n<ul>\n<li>a low antifreeze level;<\/li>\n<li>a faulty thermostat;<\/li>\n<li>poor circulation caused by the water pump;<\/li>\n<li>internal radiator contamination;<\/li>\n<li>an air lock;<\/li>\n<li>damage to the cylinder head gasket;<\/li>\n<li>excessive engine load.<\/li>\n<\/ul>\n<p>If the temperature rises while driving uphill, overtaking, or towing a trailer, the efficiency of the entire cooling system should be checked.<\/p>\n<h2>How Cooling System Diagnostics Are Performed<\/h2>\n<p>To determine the exact cause of engine overheating, a technician may perform:<\/p>\n<ol>\n<li>Computer diagnostics of the engine.<\/li>\n<li>Measurement of the actual coolant temperature.<\/li>\n<li>Inspection of the antifreeze level and condition.<\/li>\n<li>Inspection of the hoses, expansion tank, radiator, and connections.<\/li>\n<li>A pressure test of the cooling system.<\/li>\n<li>Thermostat diagnostics.<\/li>\n<li>Inspection of the fan, relays, and wiring.<\/li>\n<li>Assessment of the water pump operation.<\/li>\n<li>Inspection of the coolant circulation.<\/li>\n<li>A test for exhaust gases in the cooling system.<\/li>\n<li>Inspection of the engine oil condition.<\/li>\n<li>A final inspection after the repair.<\/li>\n<\/ol>\n<p>Comprehensive diagnostics help identify the actual cause of overheating and avoid replacing properly functioning components at random.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-4125\" src=\"http:\/\/autopark-service.com.ua\/wp-content\/uploads\/2026\/07\/dvygun-peregrivayetsya-osnovni-prychyni-2.webp\" alt=\"\u0414\u0456\u0430\u0433\u043d\u043e\u0441\u0442\u0438\u043a\u0430 \u0441\u0438\u0441\u0442\u0435\u043c\u0438 \u043e\u0445\u043e\u043b\u043e\u0434\u0436\u0435\u043d\u043d\u044f \u0430\u0432\u0442\u043e\u043c\u043e\u0431\u0456\u043b\u044f \u043d\u0430 \u0421\u0422\u041e \u0443 \u041b\u044c\u0432\u043e\u0432\u0456, \u0441\u0435\u043b\u043e \u0421\u043e\u043b\u043e\u043d\u043a\u0430\" width=\"1200\" height=\"900\" srcset=\"https:\/\/autopark-service.com.ua\/wp-content\/uploads\/2026\/07\/dvygun-peregrivayetsya-osnovni-prychyni-2.webp 1200w, https:\/\/autopark-service.com.ua\/wp-content\/uploads\/2026\/07\/dvygun-peregrivayetsya-osnovni-prychyni-2-300x225.webp 300w, https:\/\/autopark-service.com.ua\/wp-content\/uploads\/2026\/07\/dvygun-peregrivayetsya-osnovni-prychyni-2-1024x768.webp 1024w, https:\/\/autopark-service.com.ua\/wp-content\/uploads\/2026\/07\/dvygun-peregrivayetsya-osnovni-prychyni-2-768x576.webp 768w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><\/p>\n<h2>Engine Overheating Diagnostics in Lviv, Solonka<\/h2>\n<p>If the engine is overheating, the temperature rises in traffic, the antifreeze level keeps falling, or the fan does not work, visit the \u00abAutopark-Service\u00bb service station. Here, you can have the cooling system diagnosed and the radiator, thermostat, water pump, fan, hoses, electronics, and engine condition checked.<\/p>\n<p>The service station is located at 60 Kiltseva Street in Solonka, near the Lviv ring road. Timely diagnostics will help eliminate the cause of overheating before it damages the cylinder head gasket or leads to serious engine repairs.<\/p>\n<h2>Frequently Asked Questions<\/h2>\n<h3>Can water be added if no antifreeze is available?<\/h3>\n<p>In an emergency, once the engine has cooled completely, water may be used as a temporary solution to reach the nearest service station. The system should then be inspected and filled with the appropriate coolant.<\/p>\n<h3>Why does the temperature rise when the air conditioning is switched on?<\/h3>\n<p>The air conditioning system increases the load on the engine and cooling system. Overheating may be caused by faulty fans, contaminated radiators, or insufficient cooling efficiency.<\/p>\n<h3>Why does the heater blow cold air while the engine is overheating?<\/h3>\n<p>This may indicate a low antifreeze level, an air lock, or poor circulation caused by a faulty water pump. It is better to stop driving and have the system checked.<\/p>\n<h3>Can a faulty thermostat cause the engine to overheat?<\/h3>\n<p>Yes. If the thermostat does not open the large cooling circuit, the antifreeze cannot pass through the main radiator, causing the engine temperature to rise quickly.<\/p>\n<h3>Where can I have the cooling system checked near Lviv?<\/h3>\n<p>Cooling system diagnostics and repair are available at the \u00abAutopark-Service\u00bb service station at 60 Kiltseva Street in Solonka. The technicians will identify the cause of the overheating and recommend the necessary repairs.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Engine overheating is a dangerous fault that may cause deformation of the cylinder head, damage to the cylinder head gasket,&#8230;<\/p>\n","protected":false},"author":5,"featured_media":4124,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-4123","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-article"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/autopark-service.com.ua\/en\/wp-json\/wp\/v2\/posts\/4123","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/autopark-service.com.ua\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/autopark-service.com.ua\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/autopark-service.com.ua\/en\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/autopark-service.com.ua\/en\/wp-json\/wp\/v2\/comments?post=4123"}],"version-history":[{"count":4,"href":"https:\/\/autopark-service.com.ua\/en\/wp-json\/wp\/v2\/posts\/4123\/revisions"}],"predecessor-version":[{"id":4130,"href":"https:\/\/autopark-service.com.ua\/en\/wp-json\/wp\/v2\/posts\/4123\/revisions\/4130"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/autopark-service.com.ua\/en\/wp-json\/wp\/v2\/media\/4124"}],"wp:attachment":[{"href":"https:\/\/autopark-service.com.ua\/en\/wp-json\/wp\/v2\/media?parent=4123"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/autopark-service.com.ua\/en\/wp-json\/wp\/v2\/categories?post=4123"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/autopark-service.com.ua\/en\/wp-json\/wp\/v2\/tags?post=4123"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}