car overheats when idle fans work

Additional info - Heater only works when riding - I have to add a bit of coolant everyday - Changed thermostat fan control module and fans work well. If the connector was damaged to the point where it made no connection then the fan wouldnt work with the AC but youll likely have to replace the connector anyway.

Cooling System Problems That Could Cause Your Car To Overheat

The cooling fan at different.

. If your fan clutch doesnt engage when the engine starts to overheat then the fan clutch is likely shot. IF NOT THE CLUTCH IS BAD. Another reason that your car overheats when idle and AC is on may be caused by a malfunctioning cooling fan cooling motor or any connectors controls that activate the cooling fan.

Replace the fan clutch. Engine overheating while idle. Overheating When Idling Causes and Solutions 1.

So if the fan motor is weak it wont cool the motor properly therefore. First thing we need to check is the coolant level if the level is low it will have the systems you have described. If you could check these 2 things and let us know the results we can help you pinpoint the problem.

The tiniest hole along this journey could drain your coolant. Engine overheating is not related with AC misoperation. If the high speed circuit is faulty and fan keeps operating at low speed or does not turn at all the car will overheat at idle or stop.

This problem ultimately causes the failure of the fan switch which causes your car to overheat when ac is on and idle. And when the car gets overheated at slow speed or idles the engine fan can be the main reason because if the engine fan is clogged or bad it cant blow the air to the engine. Broken fan blade - When a blade of the.

Overheating at idle can be caused by a low coolant level a faulty thermostat a plugged radiator a faulty radiator pressure cap collapsed hoses non functioning cooling fans and a faulty water pump or drive belt. The gasket can blow in a way i like to call the valve effect witch air will pass threw the gasket in to the cooling system causing overheating. Another reason that your car overheats when idle and AC is on may be caused by a malfunctioning cooling fan cooling motor or any connectors controls that activate the cooling fan.

Car doesnt always over heat while idling. C cobra2411 Registered Joined Jul 31 2004 589 Posts 2 Nov 30 2005 Is your fan clutch new. If it is blowing hot air from the heater then it wont be overheating once the heater stops working the temp almost immediately starts to climb.

If I give it some rpm the gauge comes back to normal reading. If you have an electric cooling fan that isnt coming on this can cause your engine to overheat. Open the hood when the engine is running and it is hot.

The most common symptom of a failed radiator fan is that the car is overheating on idle or at lower speeds because at higher speeds the car doesnt need the use of the radiator fan. Car runs up to 220 degrees at idle with 60 degree outside temps and will keep climbing. Certain engine faults such as a leaking head gasket or poor engine running condition can also cause overheating.

Why does my car overheat when the AC is on and idling. With that unplugged turn on the key the fans should come on if not then the Fan relay is probably bad. Make sure to inspect and work on the engine when it is cold.

Step 5 If the electric fan doesnt come on when the engine reaches normal operating temperature then you either have an electrical problem or the fan is malfunctioning. You can test this by letting your car. The car not knowing that will still try to turn that compressor therefore overheating the engine due to the additional strain put on it.

Usually when your coolant level drops there is a leak to blame. Over heating only when the car is idle at a light traffic or parked for about 5 minutes and then slowly start creeping up. Temp will drop back to about 195 once going down the road.

While it seems counter intuitive a car that is low on coolant may run ok with wind hitting the radiator but when idling theres just not enough coolant to cool the engine back off. The coolant travels a really long path. Electric fans can kick on at any time.

During boost or WOT the car is running just fine with no signs of overheating. Since heat is dissipated from the cooling system by outside air flowing over the radiator cooling performance is maintained as you drive. When your car overheats when idle one of the prime suspects is the coolant.

The other thing we need to check is if the radiator fans are coming on when you turn on the AC. I turned it off and let the fans cool it down. This is varified with both gauge and a heat gun.

Car overheats in idle fans work no coolant leak coolant tank is full. When you rev the engine you should hear a big increase in fan noise AND feel a big increase in heat MOVING PAST YOU from the higher fan speed. When the car comes to a stop after a period of being driven the effect of cooling from ambient air is greatly reduced and the fan needs to switch to a high speed to maintain same engine temperature.

Dont have a overflow tank. I gave it a few revs and the temp gauge spiked again. If you see bobbles coming out then you know its the gasket.

Defective Engine Coolant Sensor. Overheating at idle and the fan doesnt run points to fan temp sensor control unit relay or other wiring issue Radiator or head gasket would cause overheat while cruising - not your problem You checked and filled the coolant in the reservoir but how does it look at the radiator cap. Without coolant there is nothing to bring the engine temperature down.

With key off unplug the Fan ECT located near the lower rad hose inside the radiator its a two wire switch. Hello my name is Dave. Bad timing Low cooling liquid level Dirty radiator outside but also inside Radiator fan malfunction Air in the engine cooling system it WILL overheat the engine and very fast Low oil level.

For example if your car tends to overheat in traffic or when idling at a stoplight or a drive-thru but the temperature falls back down to normal as you drive you might have a failed radiator fan. You should check if the radiator fan is spinning on full power when the thermostat is fully opened and the car engine is hot or while its overheating. This fan draws cooler air through your radiator when your car isnt going fast enough to do the job naturally.

Let the car cool down and take the radiator cap off and start the car and fill the radiator up to the top. Step 4 Watch your engine cooling fan. I went out to check the coolant level and the coolant was about 1 inch from the bottom of the cap when it had all cooled down.

Most likely your problem is the resistor and the fans wont come on until the full speed temperature is reached which is right at overheating or 212F. If the fans are not on when AC is off and engine is running warm then you could have a bad fan relay or Fan ECT switch.

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