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AC not blowing as Cold

AirNoob on Wed May 06, 2009 4:37 PM User is offline

Year: 1990
Make: Honda
Model: Civic
Engine Size: 1.5
Refrigerant Type: 134a
Ambient Temp: 90
Pressure Low: 64
Pressure High: 180
Country of Origin: Japan

Air is working but not as cold as it was.

When motor is cold and off I get 110psi on both the low side and high side.

At idle I get 64psi low side and 180psi high side.

At 2000rpm I get 45psi low side and 270 High side.

Then I turned off the ac and the low side went back to 110 and the high side went to 150 and stayed there.

Also If I need any major parts, is it okay to keep running the ac in these conditions until it stops working? And then just buy the part that was going bad?
The compressor is a Sanden TR70, Anyone have any opinions?

Edited: Wed May 06, 2009 at 4:42 PM by AirNoob

Chick on Wed May 06, 2009 6:23 PM User is offlineView users profile

First you need to find out if you lost refrigerant.. I would evacuate and recharge, if it was full, your expansion valve may be sticking, weak compressor, how was the retrofit done? what was changed etc..

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

AirNoob on Wed May 06, 2009 7:42 PM User is offline

The service fittings were changed along with a new expansion valve, a new drier and a used compressor with a good compression test. 2months ago.

There was a small leak, but it is fixed now. Some freon was lost, then added some, then lost some again before leak was fixed. Last week I was told the compressor had a "low pump", that was before the leak was fixed.

So is it safe to run the ac like this? Or should I evacuate and recharge? or should I replace the compressor and expansion valve again and not even bother trying to refresh the system first?

BTW when you say evacuate, do you just mean; vacuum the system right? If not, can you send a link to properly evacuate a system? Sorry Lots of questions.

Edited: Wed May 06, 2009 at 7:51 PM by AirNoob

Chick on Wed May 06, 2009 7:50 PM User is offlineView users profile

Like everything else, parts and compressors wear out. If you had it diagnosed with a bad suction scenario, I would get one that is made for R134a since the Scroll compressors really don't retrofit well in my opinion. A system flush would be a good idea, along with changing the drier and expansion valve. (Check ackits.com prices) the use a "quality" ester oil like BVA auto 100. And yes, evacuate means remove the refrigerant and pull a deep vacuum and recharge into the vacuum. There is a vac/charge thread in the facts and tips forum if you'd like to read it... Hope this helps..

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

AirNoob on Wed May 06, 2009 7:57 PM User is offline

Where do i get a compressor made for 134a that will fit my car? The link you provided is for the same TR70 r12 compressor isn't it?

Chick on Wed May 06, 2009 8:04 PM User is offlineView users profile

Yes it is, but when they are Rebuilt they are made to work with both refrigerants, R12 and R134a. Seals and O rings for both refrigerants. One problems with the R12 scrolls are leaks from the shaft seal, causing premature compressor failure. The oil is also important in both the quality and amount used which is why I suggest flushing the system and changing the drier which holds some of the oil that you have in there.. the type and quality is unknown..

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

AirNoob on Wed May 06, 2009 9:48 PM User is offline

Okay, just for information purposes.. what is the difference between a replacement seal/oring that made for R12 and one that is made to work with both.

Also, how do you flush a system? If its a long process, can you just post a link? I didnt find one in the faq, only how to flush individual components of the system. Vacuum only takes the freon out, right?

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