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Virtual Wrench
Virtual Wrench, Jeep Mechanic
Category: Jeep
Satisfied Customers: 14618
Experience:  35 years Master Mechanic
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The A/C is not cooling strongly, maybe medium. I thought I

Customer Question

The A/C is not cooling strongly, maybe medium. I thought I buy an A/C Pro and see if I can fix it by myself. Not sure, if this is the right thing to do?
JA: Have you checked the Freon level? Have you checked the hoses?
Customer: how do you check the freon level? the hoses look okay
JA: What is the model/year of your Jeep?
Customer: 1997 Grand Cherokee Laredo 5.2 l v8
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: nothing yet, that's why I thought i'll respond to you
JA: Anything else you think the mechanic should know?
Customer: the clutch is working
JA: OK. Got it. I'm sending you to a secure page on JustAnswer so you can place the $5 fully-refundable deposit now. While you're filling out that form, I'll tell the Jeep Mechanic about your situation and then connect you two.
Submitted: 5 months ago.
Category: Jeep
Expert:  Virtual Wrench replied 5 months ago.

Welcome,

I have been a professional master mechanic for over 35 years and am happy to help you with this.

Does the AC compressor kick on and off rather frequently?

Customer: replied 5 months ago.
no, right now it is in the 90's and when I switch on the car with the A/C switched on the clutch is running. When I switch off the A/C then the clutch is switching off too
Expert:  Virtual Wrench replied 5 months ago.

Thanks,

Have you connected that hose with the kit to the low side pressure port yet?

Customer: replied 5 months ago.
no, let's stay on the chart
Expert:  Virtual Wrench replied 5 months ago.

There are 2 ac ports, the low and the high side. the hose from the kit will only attach to the low side because the sizes are different. Do you know where the low pressure port is?

Customer: replied 5 months ago.
I do know where the low pressure port is
Expert:  Virtual Wrench replied 5 months ago.

Good deal,

Connect the hose to it and start it up and hold the RPM at high idle for a bit and tell me what the pressure stabilizes at.

Customer: replied 5 months ago.
Connect it with what hose?
Expert:  Virtual Wrench replied 5 months ago.

I thought you had already bought the AC pro kit??
No?

Customer: replied 5 months ago.
I actually do. But before I use it, I wanted to find out if it is the right thing, because I read on forums that one should rather use R134s? If you think it is the right thing to use, then I will go out and will find out about the pressure.
Expert:  Virtual Wrench replied 5 months ago.

Thanks

The R134a is the correct one to use. Attach the hose from the kit to the low port, start the engine turn the ac on max then after a few seconds the gauge is supposed to drop to the correct level on the chart. somewhere around 35-40 psi. if its higher, add some charge to it until it goes to the proper pressure.

Larry

I strive for a 5 star positive rating. It's the only way i get credit. You can still ask me questions for free after the rating.

Customer: replied 5 months ago.
You didn't answer my questions if I should use the A/C Pro, or if I should rather go out return it and get R134? I have the A/C Pro. Just want to make sure that I use the right thing, especially as it cost about $45.
Expert:  Virtual Wrench replied 5 months ago.

Hi,

The AC pro kit comes with the R134a..

Customer: replied 5 months ago.
Okay, I see. So, I will get out to the garage and measure the pressure. Give me a couple of mins and I'll be back
Expert:  Virtual Wrench replied 5 months ago.

ok

Expert:  Virtual Wrench replied 5 months ago.

If you run into any problems you can check this video first.

click here

Please remember to rate my service today or i dont get any credit for helping you.

Customer: replied 5 months ago.
it shows 100 psi
Expert:  Virtual Wrench replied 5 months ago.

Usually it only shows that high when the compressor clutch is NOT engaged. Are you SURE the clutch is engaged, not just the pulley spinning, but the center part... thats the clutch.

Customer: replied 5 months ago.
let me try again
Expert:  Virtual Wrench replied 5 months ago.

ok

Watch that video if you get a chance and you can see what it looks like when its engaged.

Customer: replied 5 months ago.
I did watch the video and and recharge the whole bottle of A/C Pro. It is still in the red?
Expert:  Virtual Wrench replied 5 months ago.

Are you for sure the clutch is engaged?

Customer: replied 5 months ago.
how do I test it?
Expert:  Virtual Wrench replied 5 months ago.

Just by looking at the FRONT of the compressor. When its not engaged the center is not turning and when it is engaged, the center of the compressor is turning.

Customer: replied 5 months ago.
it is turning all the time
Expert:  Virtual Wrench replied 5 months ago.

It sounds like a bad compressor but you need a set of gauges so you can read the high side pressure and low at the same time.

Customer: replied 5 months ago.
i don't have these gauges. I guess, I'll have to go to a garage. Any idea how much this can cost if the compressor is bad?
Expert:  Virtual Wrench replied 5 months ago.

You can get a compressor for around $200 and labor is about the same.

Sorry bud, but we sure gave it a good try!

Larry

Customer: replied 5 months ago.
Any other way to check the compressor?
Expert:  Virtual Wrench replied 5 months ago.

Afraid not. Getting a high and low pressure reading at the same time is the only way.....

Customer: replied 5 months ago.
A couple of questions:* What must the reading be to determine that the compressor is good or bad?
* How long should it take for the technician to diagnose what's going on?
* How long does it normally take to exchange the compressor if it is bad?
* Can there be other reasons other than the compressor, as it is cooling a little bit?
* Any repair recommendations considering that I want to sell the car?
* Is there a site you can recommend on where to buy a compatible compressor?
Expert:  Virtual Wrench replied 5 months ago.

Before you go buying a compressor you NEED to have a shop diagnose it for you. It HAS to be done with a set of gauges, NO other way to do it. Sure there can be other causes but, again, you need those pressure readings.

A tech can diagnose it in less than 1 hour.

it takes 1.3 hours labor to replace compressor

Expert:  Virtual Wrench replied 5 months ago.

Hello,

Did you have any further questions?

If not please remember to rate my service so i an get credit for helping you.

Larry

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