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Tech501
Tech501, Auto Service Technician
Category: Car
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Experience:  38 years exp, ASE Mastertech with L1 Advanced Engine performance
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96 Monte Carlo: cool..bypass..relay switch..motor is a 3.1 Liter

Customer Question

96 Monte Carlo my fan that cool the waterdown don"t come on it has a new temp.sensor an thermstat an when you bypass the fan relay switch the fan will work the other fan work went the a/c is on the motor is a 3.1 Liter.
Submitted: 11 years ago.
Category: Car
Expert:  Tech501 replied 11 years ago.

 You need to check some fuses.


Check Maxi fuses #1 and #3


Check the ECM/BAT fuse 20A


Check the ENG/EMIS fuse 15A


They supply the relay power. The schematic should help if that's not the problem. Please click on the ACCEPT button after viewing.


 




 
Customer: replied 11 years ago.
Reply to Tech501's Post: I check the fuses they are OK. But on the #2 fan control relay switch they are four prong on one side it suppose to be hot at all time one of the prong has DK BLU wire to the ECM it is hot all time, the other one is only hot when the key is in the on position now it has two pink wire I thing my problem is here can you tell where the two pink wire are go to an why it not hot all the time.
Expert:  Tech501 replied 11 years ago.
 You should have power at the red and brown wires with the key on. The white wite goes to the fan and the Dk Blu is the control wire that goes to the computer. Grounding that wire should energize the fan if both power supplies are there. If you can start the fan by ground that wire, it's the computer not giving the command. Then you would have to find out when it is supposed to.

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