Question about 1995 Pontiac Sunfire

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Cooling fan comes on and temp goes to cold then engine light comes on

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Sounds like a thermostat problem.

Posted on Jul 12, 2009

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My 92' Covette cooling fans start up about 10 seconds after I start up the car cold. Then the check engine light comes on. After about 7 minutes, the fans turn off and then the check engine light goes out....


Hey Les , how's it going ? The thing to do would be hook-up a scan tool an see what the ECM is seeing as far as engine temperature data ! Could have a shorted coolant temp. sensor . And when the check engine light is on a trouble code is present an should point you in the right diagnostic path . For some reason the engine computer thinks the engine is hot when it's not. Choosing an Automotive Scan Tool EricTheCarGuy

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the air con fan comes on with the air con switch. the engine cooling fan comes on when the engine temp. censer reaches operation temp. most times the air through the radiator when driving is enough to keep the censer cool and the fan not working if you stop at lights for any length of time it will come on.

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1. Check the coolant level if you have not already.

2. The most likely cause is a stuck thermostat so that when the engine is getting up to operating temp the thermostat is not opening at all - or enough - for the coolant to flow freely between the radiator and the engine to cool the heated fluid. If you check the radiator after driving and find it is cold it is a sure sign that the heated coolant that is circulating through the engine at operating temp and higher is not getting to the radiator. The first thing I would do is to change the thermostat and re-check. At the same time completely flush the coolant and replace it with new fluid of the correct spec.

The radiator fans are not going to operate when the fluid in the radiator is cold because the hot fluid cannot flow through from the engine. The fans have a temperature sensor switch.

3. If that does not solve the problem I would suspect the water pump has corroded and needs to be replaced. However from the symptoms you have described I believe a new thermo will fix the problem.

4. Don't drive the car when it is overheating. This is a certain way to blow the head gasket and potentially crack or warp the cylinder head. (In a worst case you can crack the engine block.) It will be nice and expensive to repair if you blow a head gasket or damage the cylinder head.

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Cooling Fans coming on shortly after starting cold vehicle Ford Winstar 2001


climate control units in most cars use the ac system to regulate temp in the cab. the ac system requires a fan to pull air over the condensor on the front of the car. its normal for a fan to come on. unless you have a bad engine temp sending unit thats causing the engine cooling fan to come on improperly. try turning off the heat and ac and see if it still comes on.

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Need help with temp gauge reading cold.


is the fan is coming on if yes and the cooling system hasn't been opened uptry a coolant sensor,if the system has been opned it might need to be blead,asuming you have no leaks

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Hi it sounds like you have a temp sender playing up I think there are 3 on your engine,

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1991 Honda civic 4 dr. The temp gage stays on cold all the time and the engine cooling fan never kicks on. Is there a relay somewhere for them? As soon as it gets hot the check engine light comes...


check on the engine around the thermostat housing for a fan control sensor. if your engine fan doesn't come on when the a/c is on, then thats your prob.

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