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SuperDave
SuperDave, ASE Certified Technician
Category: Pontiac
Satisfied Customers: 1491
Experience:  over 16 years experience
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Pontiac Grand Am SE: 1999 Pontiac GrandAM 3.4L - Cooling fans

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1999 Pontiac GrandAM 3.4L - Cooling fans don't come on when coolant temp is around 150 degrees, also don't come on with a/c on. A/C doesn't produce cold air. Removed connector from coolant temp sensor and cooling fans come on. Opened cap on relays for hi and low and tripped relay and the fans come on. What could be a probable cause?
if the a/c compressor does not come on the fans won't either.you have a bad coolant temp sensor
Customer: replied 5 years ago.
I'm sorry I meant to mention I just replaced the coolant temp sensor and the fans still don't come on.do I need to disconnect the battery for a length of time?
the engine should be above 190 degrees to turn on the fans
Customer: replied 5 years ago.
Temp was about 250 according to gauge on dash.
graphic
Customer: replied 5 years ago.
So if I get to step 7 and the test light illuminates it says go to engine controls for further diagnostics. Does this mean it is the ecm?

graphicgraphic

Customer: replied 5 years ago.
Would I need a specific scan tool to do this with?
the testing in the flow chart is what a mechanic at a dealership would use.a special scan tool is required.
Customer: replied 5 years ago.
Ok. Just checking. I appreciate the info.
no problem
Customer: replied 5 years ago.
Ok I guess just one last thing, do you have something showing all of the DTC'S? and if not can if be found on the net?

you can go here:

http://www.obd-codes.com/trouble_codes/

SuperDave and 4 other Pontiac Specialists are ready to help you
Customer: replied 5 years ago.
Thanks!

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