1000jeep

Hello everyone I'm having some A/C issues, and I havent found something on the forum that is similar to the problem I have. So here is whats going on:

1. Compressor is kicking in (once when you turn on the A/C and stays)

2. Block at firewall is icying up (I dont know the name of this part but both high and low lines connect to it then it goes to the inside of the car small square alloy or something)

3. Slight bubbles on the dryer3.


4. A/C not getting cold



I guess I dont understand why there is ice building up but its not getting cold?? I dont know what that part is called but its a block just before it goes to the inside of the car by the fire wall. both lines attach to this.


Anyone help please I'm dreadding the Texas heat with no A/C

Other things to take in consideration this is a R12 System and if in deed its low how do I recharge it? doesnt it have to have specific amounts and pressure?


Thanks in advance

ol"blue

If it's icing up at the junction block you're not low on freon. Someone else can chime in here but I think it's either a blend door issue, heater control valve problem, or a vacuum issue.

TrekkerJmm

Hi, Check your Personal Messages...Tj

1000jeep

Thanks TJ, I'll read up on it FSM when I get home... so even tho its icing up it the R12 is low?

Also I have access to some r12 at a decent price, how do I refill it? and how do I know I've put too much or not enough? I guess that info will be on the FSM?

Does that other stuff you sent me really work (Freeze 12)? I would hate to be out a compressor if it doesnt mix well


Thanks for all help!

TrekkerJmm

The freeze 12 is supposed to be a good replacement for r12, According to the FSM it says it may be low on freon but also check what Ol Blue said about the valves and heater control because it may be that too...Tj

4.3L XJ

Checking your air flow is right on. Try it in Max AC. This recirculates the air. Make sure you try this after your coil is thawed out. If it is still frozen, it will not pass any air. If you can't get adequate air flow, you will need to fix it. There is another issue that is more likely. There is a pressure, temp sensor that kicks in and out the compressor. Since your compressor stays on I am thinking this is malfunctioning.

1000jeep

I tried it on max A/C. I guess I can turn it to heater then move it to that see if in deed something is frozen, but if so wouldnt it at least cool when I first start the jeep?

I think the compressor might be staying on because of the freon might be low..

Thanks for all the input I'll do more trouble shooting when I get home.

ol"blue

The system has a safety switch that prevents the compressor from engaging when the freon is too low. FYI

1000jeep

Well dam... I guess I'm out of ideas then

If it was slightly low would it stop cooling completely? there are bubbles on the dryer.

ol"blue

Put some gauges on it and check the system pressure. There's a possibility that you've got too much freon in it. That will cause the same issues also.

1000jeep

Can I rent those for R12 for Autozone? are they the same as the R134?

Just some brief background I drove the Jeep from San Francisco>Nevada>Arizona>Utah>Colorado>Kansas>Okla homa and finnaly to Texas.... all in 10 days... and when I got to Texas is when it stop working... it worked fine in all through the desert... maybe it was something to do with the Altitude change in Colorado that triggered something to go bad?

ol"blue

R-12 and R-134 systems use different fittings so that they can't be mixed.

1000jeep

That makes sense... I wonder if I can rent these? I dont know if you read the last portion of the previous post Ol"Blue I took the jeep on a long trip (altitude changes from sea level to 14k+ feet) before the A/C actually failed you think this might have caused something? I dont want to beat this down I just wondered if finding what caused it might help me find out where the problem is... maybe the Altitude changes caused a leak

Thanks for all the replies!

ol"blue

Unlikely. More than likely frozen over as stated before. That or the blend doors are stuck.

4.3L XJ

You stated that you could see a few bubbles in the sight glass. That is what you should see. It doesn't sound like you are over charged. Let it thaw completely. If you have frost on the TXV, then you have a block of ice in there.