Question about Pontiac Grand Am

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AC not blowing cold and the coolant fans never came on even when the coolant temp reached 200`. could this be a relay problem? all other fuses check out fine.

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The fans should work when a/c is on. They wont come on with a/c off until approx 225f . Of course when you dont tell what kind of car this is, I'm just guessing.

Posted on Nov 10, 2010

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How to find out what keeps blowing my fuse and overheating my Nissan Sentra 1.8 2006?


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if that is the case , replace that relay
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that sensor reads the coolant temp and reports to the ECM so that the air/fuel mixture can be adjusted correctly
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the ac fan starts as soon as the ac is switched on
the fan is provide cooling of the condenser before the radiator to prevent high head pressures in the ac compressor
it is the fan at the front of the car mand does not affect engine temp
there is a radiator fan between the engine and the radiator that will not start until the coolant temperature reaches a set temp at which point the ECM switches that fan on
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Primary cooling fan only comes on when i turn ac on


You would need a scanner and an inferred temp sensor to troubleshoot the system.
You need to know what the actual engine temp is, and what the temp sensor is telling the computer.
If and when the engine reaches 220 degrees, the engine temp sensor should be sending that data to the computer and it should ground the fan relay to activate it.
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It is possible the coolant level is low, or something else preventing the temp sensor sending the correct data.

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Can you jumper the relay to make the fans run ? The computer sends a ground to the relay to power the fans when the coolant temp reaches 220 degrees or when the ac pressure reaches 200 psi on the high side.

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Did you check for voltage at the relay ?
The computer grounds the relay when engine temp reaches about 230 degrees or the ac high pressure is above 200.
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My cooling fans will not come on with the ac on nor when the temp reaches as high as 235 degrees while driving..At first trhe fan would come on when i turned the ac on but when i tried to test the other...


On this vehicle there are 3 cooling fan relays and three fuses for the cooling fans.There are 2 in the under hood fuse panel and 1 in the instrument panel.You need to check the fuses and make sure they are all good.They get there input via the coolant temp sensor for the computer which in turn signals the cooling fan relays to turn on the fans.The other thing with the a/c clutch coming on and off.If the a/c system is low on freon this will cause the clutch to cycle more.If you can get a scan tool you need to monitor the coolant temp sensor to see if it is reading the same as the temp on the temp gauge.The other thing you an do is check for codes.Hope this helps and let me know what you come up with.

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The cooling fan on my 2001 Mustang runs constantly. Even when the engine is cold. The temperature gauge reads normal. The engine has 39,000 miles. What is the problem?


low engine coolant ,coolant temp. switch for the fans,fan relay shorted closed.and possibly a computer.check for codes,coolant level in radiator when cold,remove relay for fan and see if the fan stops. check to see if the ac is on or if the heater ac switch is in defrost position. ac will be on and coolant fan is commanded on also.i hope this will help.

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the cooling fans are run by a relay it's located in the junction box. check this. there is also a thermoatic sensor located near the fans next to radiator. the fans should free spin when the engine is off this is a good indiacator that it's not the fan themselves. if the relay checks out(run engine and switch the fan relay with the a/c clutch relay when the engine reaches 180 degrees you will feel the upper radiator hose get hot the fans will turn on a short time later iof they don't it's the temp sensor near the radiator if they do it's a bad relay...please rate this thanks

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