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Amedee
Amedee, Jeep Technician
Category: Jeep
Satisfied Customers: 24433
Experience:  ASE certified Technician advanced level specialist. Wisconsin certified emissions state inspector
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My name is rob. issue I'm having is an overheating 2002

Customer Question

Customer: 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?
JA: Thanks. Can you give me any more details about your issue?
Customer: Its a 4.0L I6
JA: OK got it. Last thing — Jeep Mechanics generally expect a deposit of about $18 to help with your type of question (you only pay if satisfied). Now I'm going to take you to a page to place a secure deposit with JustAnswer. Don't worry, this chat is saved. After that, we will finish helping you.
Submitted: 10 months ago.
Category: Jeep
Expert:  Amedee replied 10 months ago.

Hello and welcome! My name is ***** ***** I can assist you with your question. Can I start by getting your VIN? Thank you!

Customer: replied 10 months ago.
Dont have it readily available
Expert:  Amedee replied 10 months ago.

So the relay was replaced twice correct?

Customer: replied 10 months ago.
I bled air out of the system
Expert:  Amedee replied 10 months ago.

Can you tell me the inputs to the relay?

Customer: replied 10 months 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
Expert:  Amedee replied 10 months ago.

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

Customer: replied 10 months ago.
It gets up to 4v on from the PCM but still doesnt turn the fan over
Expert:  Amedee replied 10 months ago.

what color wire gets 4 volts?

Customer: replied 10 months ago.
Its the skinier one in the middle. Dont have it in front of me
Expert:  Amedee replied 10 months ago.

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

Customer: replied 10 months ago.
Its the skinner green one
Expert:  Amedee replied 10 months ago.

That comes from the PCM.

Customer: replied 10 months ago.
that one is giving me 4V
Expert:  Amedee replied 10 months ago.

All of the time?

Customer: replied 10 months ago.
With engine running at operating temp
Expert:  Amedee replied 10 months ago.

Ok, then the PCM is likely at fault.

Expert:  Amedee replied 10 months 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.

Customer: replied 10 months ago.
I will have to go to shop and swap with a known good PCM so I can rule out the PCM. Thank you.
Expert:  Amedee replied 10 months ago.

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

Expert:  Amedee replied 10 months ago.

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

Expert:  Amedee replied 10 months 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!

Expert:  Amedee replied 10 months ago.

.

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