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My name is rob. issue I'm having is an overheating 2002

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My name is *****...

My name is ***** ***** I'm having is an overheating 2002 Cherokee laredo overheating. I replaced waterpump, thermostat and a new fan relay under passenger side headlight. I cant get the fan to come on. I checked for power at the relay. I have a good 12v going to the fan relay and used a jumper to power the fan on. Fan kicks on once powered. I run the motor to operating temp and get 4v at one of the skinnier wires going to relay. Be advised this the 2nd relay from autozone I put in because I thought the 1st one I purchased was faulty was. What else could be the issue?

Mechanic's Assistant: Thanks. Can you give me any more details about your issue?

Its a 4.0L I6

Submitted: 2 years ago.Category: Jeep
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Answered in 4 minutes by:
1/25/2016
Jeep Mechanic: Amedee, Jeep Technician replied 2 years ago
Amedee
Amedee, Jeep Technician
Category: Jeep
Satisfied Customers: 27,817
Experience: ASE certified Technician advanced level specialist. Wisconsin certified emissions state inspector
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Hello and welcome! My name is ***** ***** I can assist you with your question. Can I start by getting your VIN? Thank you!

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Customer reply replied 2 years ago
Dont have it readily available
Jeep Mechanic: Amedee, Jeep Technician replied 2 years ago

So the relay was replaced twice correct?

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Customer reply replied 2 years ago
I bled air out of the system
Jeep Mechanic: Amedee, Jeep Technician replied 2 years ago

Can you tell me the inputs to the relay?

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Customer reply replied 2 years ago
4 wires going into. One thicker wire running directly to fan input, another thicker constant 12v and 2 thinner wires. One that receives signal from PCM and guess the other is a ground
Jeep Mechanic: Amedee, Jeep Technician replied 2 years ago

So what signal is missing to the relay preventing it from coming activating?

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Customer reply replied 2 years ago
It gets up to 4v on from the PCM but still doesnt turn the fan over
Jeep Mechanic: Amedee, Jeep Technician replied 2 years ago

what color wire gets 4 volts?

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Customer reply replied 2 years ago
Its the skinier one in the middle. Dont have it in front of me
Jeep Mechanic: Amedee, Jeep Technician replied 2 years ago

I cant give you accurate information until you give me accurate information. I need to know which wire

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Customer reply replied 2 years ago
Its the skinner green one
Jeep Mechanic: Amedee, Jeep Technician replied 2 years ago

That comes from the PCM.

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Customer reply replied 2 years ago
that one is giving me 4V
Jeep Mechanic: Amedee, Jeep Technician replied 2 years ago

All of the time?

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Customer reply replied 2 years ago
With engine running at operating temp
Jeep Mechanic: Amedee, Jeep Technician replied 2 years ago

Ok, then the PCM is likely at fault.

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Jeep Mechanic: Amedee, Jeep Technician replied 2 years ago

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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Customer reply replied 2 years ago
I will have to go to shop and swap with a known good PCM so I can rule out the PCM. Thank you.
Jeep Mechanic: Amedee, Jeep Technician replied 2 years ago

Your welcome! Please dont forget to rate. Have a great night!!

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Jeep Mechanic: Amedee, Jeep Technician replied 2 years ago

You should see the rating sytem towards the bottom of the page.

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Jeep Mechanic: Amedee, Jeep Technician replied 2 years ago

Hello! It's Amedee from just answer. I see that you have viewed my last reply but have not responded back or rated my answer as of yet. I just wanted to see if you needed any further assistance or if your happy with my help. Please let me know!

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Jeep Mechanic: Amedee, Jeep Technician replied 2 years ago

.

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