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The engine is overheating and the cooling fan does not kick on until you turn off the car, but turns off again when you start it, what would cause that?

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As you know the fans are working it can only be the temp sensor or the relay.and as the sensor works off the water temp to short out a switch,it can therefore only be the relay.......also with vw cars when engine is hot and running undo the topmost hot hose clip and vent any airlock(its in the service book)

Posted on Aug 21, 2010

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We borrowed our daughter's Hyundai Santa Fe to make a trip to the mountains on a 105 degree day. It was doing great on mountain highways until we stopped after about 3 hours.


May be a bad fan or thermal switch not working. The a/c condenser sits in front of the radiator. It may be that the load on the engine going up the mountain is too much for just the air blowing across it to keep it cool, and the car shuts the a/c off to try and keep engine temp down. Cruising along on level ground is enough to keep things cool. Going up the mountain means more engine heat and probably reduced speed, which reduces air flow, especially if a fan isn't working.
Let car cool off, start engine and let it warm up without driving. Monitor temp and fans. When temp gets about normal, look for fan to kick on. Then when turning on a/c, look for the other fan to kick on. Don't let engine overheat. If one or both fans don't come on, start there. Check fan motor not locked up, relay working, fuse/wiring good.

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Compressor and fans do not turn on until rev engine


I passed this question the first time I read it, so I will take a stab at it now.
The fans don't come on until the compressor has pumped the freon pressure up to say 150 or 200 psi. And the compressor clutch has to have voltage to engage the clutch.
I wonder if the clutch is going and needs 14 volts instead of 12 to engage ? Or the relay that powers the clutch ?
Speeding up the engine would increase voltage from the alternator.
This is assuming the serpentine belt is tight and everything else is working correctly.
I think I would swap the relay with another and put a meter on that circuit to the ac clutch to see what it takes to engage it.

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W\hen car gets hot and we turn it off it wont start again until it cools down. It takes about 13 to 20 min before it will restart.??? Please help me


{: ) The engine control module is programmed to protect the engine by disabling the starting system whenever it detects that the engine temperature is beyond safe limits. Depending on how fast the engine cools, it will resume normal starting after cooling down for a while.
A diagnostic scan tool readout can give you a quick idea about the possible causes of your engine overheating. For the meantime, as soon as you can start the vehicle after cooling down, drive the vehicle and try to turn off or minimize the loads , and avoid traffic sitting as possible, just enough time to reach home or a nearby service shop.
There are several things that need to be checked:
The coolant level and quality, and check for signs of coolant leaks.
The cooling fans,are they operating as designed? Check for fan blades damage or cracks.
The water pump could be faulty. Check also the engine belt.
The engine oil.
If the engine temperature sensor is faulty, it can also bring inaccurate signals and may affect operation of the cooling fans.
Check fuses and relays that power the cooling fans.

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is the car running hot? some cooling fans never come on going down the road because the air comjng through the front of the vehicle keeps the car cool enough that it doesn't need to come on. but if it is overheating then you may want to check the cooling fan relay.

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Engine cooling relay pulls in when turning ignition switch on, fans do not come on. On fan control module on "main" fan there is a small guage wire in between the power and ground wires, by...


If you are having a problem with overheating then I would be worried about it I have worked on these types vehicles alot and most the time when you turn on the vehicle the fans dont normally kick in until the teperature rises then they will kick in just long enough to cool the engine down then they will turn off then the cycle begains again over and over so you see it is always that when you turn on the vehicle that the fans should turn on. Yes the ets or ects does send the signal to have the fans turned on but if the vehicle does not need to be cooled then they will not turn on. Try idling the vehicle long enough to heat the engine up to a temperature hot enough to turn the fans on you will see they come on then off DO NOT OVER HEAT THE ENGINE THOUGH.

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The inoperative cooling fan needs to be diagnosed,run the engine until it reaches 229degrees and seeif the fan gets power to turn on if so then replace the fan if not check the wiring and cooling fan relay and repair or replace as needed.

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Car overheated and antifreze was boiling and spewing over until engine cooled. 2004 jeep liberty 2wd. Thanks!


Need to know what caused the overheating, possible broken serpentine belt, thermostat, water pump, radiator, fan clutch, cooling fan motor. After motor has cooled down fill radiator with water till full, look make sure serpentine belt not broke, start engine run about 5 minutes, turn off, let sit 3 minutes, start engine look at temperture gauge is it over half way of gauge, Do you have a fan blade driven by water pump or electric fans?

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1 Answer

Engine Fan not turning On


HAVE THE INTAKE MANIFOLD GASKETS CHECKED FOR LEAKAGE.IT IS A VERY COMMON PROBLEM WITH THOSE VEHICLES.WHEN THEY ARE BAD THEY CAUSE ALL KINDS OF OVERHEATING PROBLEMS.

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1 Answer

2000 Plymouth Voyager Overheating


cOOLING fAN tURNS ON @ 210-230 dEG. tEMP sENSOR bAD & OR fAN relay cAN cAUSE THIS pROBLEM

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2 Answers

94 honda is overheating


I dont think the transmission has anything to do with your overheating problem...Check to see if there is water in the oil...If there is water in the oil then it could have a head gasket problem..Did you ever replace the thermostat? If it is stuck then it would also cause overheating...Excessive exhaust backpressure because of a clogged catalytic converter could also cause overheating..Also check belt tension and condition. A loose belt that slips may prevent the water pump from circulating coolant fast enough and/or the fan from turning fast for proper cooling...Another thing it could be is a faulty Water pump -- Any wobble in the pump shaft or seepage would call for replacement. In some instances, a pump can cause an engine to overheat if the impeller vanes are badly eroded due to corrosion or if the impeller has come loose from the shaft. The wrong pump may also cause an engine to overheat. Some engines with serpentine drive belts require a special water pump that turns in the opposite direction of those used on the same engine with ordinary V-belts... Also check the Fan -- With mechanical fans, most overheating problems are caused by a faulty fan clutch, though a missing fan shroud can reduce the fan's cooling effectiveness by as much as 50% (depending on the fan's distance from the radiator) which may be enough to cause the engine to overheat in hot weather or when working hard.

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