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1998 3.1 Cooling fans don't turn on when ac is switched on.

Customer Question
1998 Monte Carlo 3.1 Cooling fans...
1998 Monte Carlo 3.1
Cooling fans don't turn on when ac is switched on. Compressor turns on, but not the fans.
The fans will turn on when engine temp gets high enough.
Submitted: 1 year ago.Category: Chevy
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Answered in 5 minutes by:
9/7/2016
Chevy Mechanic: AMEDEE, CHEVY TECHNICIAN replied 1 year ago
AMEDEE
AMEDEE, CHEVY TECHNICIAN
Category: Chevy
Satisfied Customers: 27,115
Experience: ASE certified tech ADVANCED LEVEL SPECIALIST. Wisconsin certified emissions state inspector
Verified

Hello and welcome!

My name isCustomerand I can assist you with your question.

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Chevy Mechanic: AMEDEE, CHEVY TECHNICIAN replied 1 year ago

Can I start by getting your VIN and the codes in the computer? Thank you!

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Customer reply replied 1 year ago
Check engine light is not on. I will get the vin and back in a minute
Customer reply replied 1 year ago
2G1WW12MOW9278872
Chevy Mechanic: AMEDEE, CHEVY TECHNICIAN replied 1 year ago

Sounds good

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Chevy Mechanic: AMEDEE, CHEVY TECHNICIAN replied 1 year ago

Thank you for that information. One minute

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Chevy Mechanic: AMEDEE, CHEVY TECHNICIAN replied 1 year ago

Ok, sorry for the delay!

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Chevy Mechanic: AMEDEE, CHEVY TECHNICIAN replied 1 year ago

The first thing you are going to want to do is check the fuses and cooling fan relays and check to ensure that the cooling fans receive power when the relays are activated by the PCM.

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Chevy Mechanic: AMEDEE, CHEVY TECHNICIAN replied 1 year ago

If the powers to the relays and fuses check out good, then chances are the PCM is not grounding or activating the cooling fan relays. This is either due to a bad engine coolant temp sensor or a cooling system issue (such as low coolant, air pocket in the system, bad radiator cap or blown head gasket). Sometimes the PCM itself may go bad causing this issue as well but that would be a last resort.

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Chevy Mechanic: AMEDEE, CHEVY TECHNICIAN replied 1 year ago

Have you checked the relays and for power to the fan relays? Do you need a wiring diagram for this circuit?

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Customer reply replied 1 year ago
a wiring diagram would be helpful.
Does the signal for "on ac" go through the temp sensor before the relay?
Chevy Mechanic: AMEDEE, CHEVY TECHNICIAN replied 1 year ago

It goes through the PCM.. which should allow the cooling fans to run (or at least one)

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Customer reply replied 1 year ago
Regardless of engine temp, correct?
Chevy Mechanic: AMEDEE, CHEVY TECHNICIAN replied 1 year ago

Thats correct!

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Chevy Mechanic: AMEDEE, CHEVY TECHNICIAN replied 1 year ago

If this is the case, I suspect a power supply issue to the cooling fans or relays or simply a bad PCM.

I am glad I can help!

It has been a pleasure working with you. Please dont forget to honor your good faith deposit by rating my answer as "Excellent Service" for assisting you today.

Please let me know if you have any further questions.

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Chevy Mechanic: AMEDEE, CHEVY TECHNICIAN replied 1 year ago

Hello! It'sCustomerfrom just answer.

I am just checking in to see if you need any further assistance?

Let me know!

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