AC not blowing cold 30 psi low side 100 psi high side 75 ambient

[03wgn5spd]

Any idea what the issue can be?

Seems 175 high side 30 low side is more like it.

Thanks.

 

[P2B]

Check your radiator/condenser fan operation NOW

Mk IV Manual AC electrical & cooling fan troubleshooting and repair Now is the time of the year to check that your pair of electric fans that provide cooling for both the radiator and air conditioner condensor are functioning. Do not needlessly age your Air Conditioning compressor by running it...

forums.tdiclub.com

Start there. Post 1 has links to step by step troubleshooting guides, check for electrical issues first.

I've actually never checked pressures in a MK4 AC system, always found an electrical issue before getting that far.

 

[03wgn5spd]

Check your radiator/condenser fan operation NOW

Mk IV Manual AC electrical & cooling fan troubleshooting and repair Now is the time of the year to check that your pair of electric fans that provide cooling for both the radiator and air conditioner condensor are functioning. Do not needlessly age your Air Conditioning compressor by running it...

forums.tdiclub.com

Start there. Post 1 has links to step by step troubleshooting guides, check for electrical issues first.

I've actually never checked pressures in a MK4 AC system, always found an electrical issue before getting that far.

Fans run fine and compressor clutch engages fine when ac button is pressed. Just replaced txv valve which was original and had alot of bb looking ferrous material in it from a previous failed compressor I assume. Most threads here show 30 low 175 psi is reasonable at 75 psi ambient so no shortage of info there. I don't think it's an electrical problem and that thread is 69 pages long. Cools to about 62 in the shade at 75 degree ambient. Pulled a vacuum for about an hour and fed it 28 ounces of r134.

 

[dieseldonato]

Did you flush the system to get all the junk out from the failed compressor? Replace the receiver dryer? Also possible your blend doors are doing the famous foam fall off.

 

[csstevej]

Just to add to dieseldonato statement check and see if you can move the blend door .
See if the pivot on the bottom , aft of the air bag module has dropped down about 1/8 of an inch. You need to remove the panel next to the go pedal and take a look.

 

[03wgn5spd]

Did you flush the system to get all the junk out from the failed compressor? Replace the receiver dryer? Also possible your blend doors are doing the famous foam fall off.

No, I did not flush the system. I did not change the drier. I was a bad boy I know. I have a condenser with drier ready to put on but it looks like a pain in the butt to install.

 

[03wgn5spd]

Just to add to dieseldonato statement check and see if you can move the blend door .
See if the pivot on the bottom , aft of the air bag module has dropped down about 1/8 of an inch. You need to remove the panel next to the go pedal and take a look.

I have been holding off checking this stuff cause I was scared of the enormity of the task. Is there any video on checking this. I am having a hard time visualizing this.

 

[csstevej]

Check this video out

Don’t freak out because the whole HVAC is out …..can easily be done in the car.

 

[csstevej]

This one is checking while in the car.

 

[03wgn5spd]

Thanks!

 

[Gothmolly]

My AC hasn't worked in a few years. Fans won't come on.
MkIV's are going on 20 years old now, just let them die gracefully.
If you want AC, buy a new car.

 

[csstevej]

My AC hasn't worked in a few years. Fans won't come on.
MkIV's are going on 20 years old now, just let them die gracefully.
If you want AC, buy a new car.

Why? It doesn’t take much to fix them. Just because it new doesn’t mean that won’t break too.
I’ve had several brand new cars that have had issues , and the newer one a a pain in the a$$ to work on.
Everything is a special tool or a special electronic device to test something…..I believe in the KISS rule,

Keep
It
Simple
Stupid.

Ok…I’m off the soap box…..

 

[03wgn5spd]

My AC hasn't worked in a few years. Fans won't come on.
MkIV's are going on 20 years old now, just let them die gracefully.
If you want AC, buy a new car.

Oh heck no!!!! I wish I had it as easy as you! My 21 year old sedan blows ice cold with me at the helm of both AC systems even with foam spitting in my eyes!

I am willing to bet that my new TXV is clogged again with BBs because I am too much of an ac hood rat to change the dryer and this is why my high pressure is low.

 

[Genesis]

If the dryer is plugged it will eventually burn up the compressor. The compressor relies on the circulating refrigerant to cool it; the built-in regulator will keep it from exploding (or blowing the relief valve) BUT not from overheating if refrigerant circulation is abnormally low.

 

[STDOUBT]

MkIV's are going on 20 years old now, just let them die gracefully.
If you want AC, buy a new car.

Dear sir,
I am writing to inform you that I wholeheartedly disagree with your thesis.

https://en.escuderia.com/peugeot-203-yvonne-abgrall/

A couple and their car: A 50-year love affair

Tom and Christine Eaves used the car on their wedding day in 1968 and it's still "part of the family".

www.bbc.com

 

[dieseldonato]

The bb as you are refuring to are likely the desiccant from the receiver dryer that got pushed throughout the system with the failure of the compressor. Seen it quite a bit on equipment. Compressor goes boom, crap makes it down stream and chews up the expansion valve and receiver dryer, cloggs the orifice tube ect..... normally thays why it's reccomended to replace certain things and flush the system when a compressor goes out. Also make sure rhe new compressor has oil in it, and if the mfg reccomends adding oil to the system. Typically after a system is flushed you should have to add make up oil as the oil is carried by the refrigerant through the system.