Question about Hyundai Motor 2004 Sonata

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Wants to overheat even when fans come on

Car runs hot when driving slow, at stop lights or when going up hills whenever im not driving on highway

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It sounds like your fans are not working. you should check your owners manual and locate the fuse for the engine fan and check it. now if the fuse is good Bring the car to your local repair shop and have this problem checked out. asap

Posted on Apr 21, 2009

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My 2004 3400 closed system ,runs hot in town unless heater is on. driving up a mountain pass it gets very hot.on a flat highway runs normal. new t state,resivior cap, both fans work no leaks or smell


Radiator fan motor or radiator fan thermostat defective/

Also there is a relay that operates the fan motor

In town not enough air passing through radiator allowing it to over temp.. With heater fan running acts like cooling fan keeping engine cool

Highway driving ample air passing through radiator without fan.

Hill climbing requires cooling fan/

Hope this helps?

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2002 lincoln. Ls v8.. burning smell?? Tried to run hot after 15min drive at a red light but when i took off went back to half way? Keeps running hot??


Engine is too hot which is burning oil and road dirt off the engine. Sounds like a bad thermostat or a water pump problem. The radiator may be partially blocked too.

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You have to bleed the air out of the system. There are 1 maybe 2 bleeders on the front of the engine on the cooling system bypass pipe one near the upper hose the the othe on the drivers side of the pipe. They are brass with a small bleeder valve in the middle. Get the car up to temperature and take your time to allow all the air out. Refill cooling system after it cools. Hope you didn't do any damage running it hot.

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The radiator fan on my 2007 bmw 525i works fine while car is driving. Once i stop at a red light or in traffic the the fan stops working, ac blows hot air and mins later the car overheats. The car has a...


My guess is that your electric fan is NOT operating at all. Under normal conditions, just going down the highway, your cooling system will function just fine without a fan running. The air flow through the radiator is adequate to keep things cool. However, when you stop, you quickly get into an "overheat" situation. Actually, you should be able to hear your fan begin operating when your engine temperature starts climbing or your air conditioner requires the fan to do its thing. Note: If you've ever severely overheated your engine, your problems may be worse than just a fan not running, but you really do need to confirm whether your fan is operating correctly, or not. Another note: I had a vehicle with a tendency to overheat when stopped. It turned out to be a faulty (leaking) pressure cap on the cooling system.

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Have bmw 320i 2001 only 55570 miles. even driving after 10 miles engine get hot. no problems with driving , no warning light but it stays hot even after2 hours. please need advice. car was checked


This bmw is overheating , even after 2hrs, the engine will still be hot after it verheats. the basic thing to do first is to allow the engine to cool down 5-6 hours or even overnight.then check to see if the cooling system is full of coolant. this problem may be caused if lets say the coolant level is low, this can happen if theres a leak in the system. if low fill system and then have it checked for leaks.another problem if the system is not low then you may have a bad thermostat, a bad thermostat will not allow the coolant to flow inturn making engine overheat, the the last common problem could be a bad fan, start in the order i listed as far as the thermostat watch the gauge and feel the lower hose, if the gauge goes to hot and the lowe hose is luke warm or cold and the top radiator hose is hot then the thermostat is bad. the last test is for the fan, if the top hose and the lower hoses are hot and the car is starting to overheat then it may be the fan, see if the fan is spinning, this car may have an electric fan or belt driven fan, if its electric then see if its running, if the fan is not running then testing need to be done to see why, the fuse and the relay will need to be tested and then the fan itself. if the fan is belt driven then you will see if the belt is on the fan pulley and then check the fan clutch, the way the fan clutch works is the fan will run at a slowwer speed than the engine and then when the heat from the radiator gets hot and blows on the front of the clutch this causes the fan clutch to lock up and makes the fan spin faster. check to see if this is happening but if this were to be the problem or if the fan was aproblem the car would not overheat as you are driving rather it would overheat at a stop or in slow traffic because the air flow from the driving would act like a fan as the air flows through the radiator from driving this would cool the engine if it was the fan, but if the car overheats even while moving then it would not be a fan problem but rather the thermostat or low coolant. there is another problem but i would start with these. hope this is helpful.

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You need to get the cooling fan checked,it may need a temperature sensor,fan relay or the fan motor may be burnt out.You can check the fan by running your own power and ground to the plug that comes out of the fan motor,unplug it and put the ground to the black wire and positive power to the other one,if it works then the next step would be to check the fan relay.The most common problem if the fan doesn't work but can be made to work with jumper wires is the temperature sensor,you can check it by unplugging it and jumping the wires in the plug.If the rad fans work then you are down to either the water pump or a plugged radiator,a rad shop should be able to narrow it down for you.

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