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High pressure on suction side...squealing compressor

davegonz on Tue August 14, 2007 11:19 AM User is offlineView users profile

Year: 1991
Make: Toyota
Model: Land Cruiser
Engine Size: 3.9 TDI
Refrigerant Type: R134a
Ambient Temp: 95
Pressure Low: 100
Pressure High: 275
Country of Origin: Venezuela

Well, after working on my truck replacing the compressor (nippo denso rebuilt), TXV, dryer, and adding the required oil, I pulled a vacuum for 30 minutes. I noticed no leaks so I proceeded to start filling her up with R-134a. I didn't even make it past one can when I noticed the compressor starting to shriek. I look at the gages and the suction side pressure is freaking 100 psi. So quickly pull the can off and proceed to shut down the truck. I am at wits end with this truck. What could be causing the high pressure on the suction side? One thing I thought about was that the radiator fan is electric and won't turn on unless the radiator is hot. But will this lead to excessively high pressures on the suction side? Could my evaporator core be plugged up?

mk378 on Tue August 14, 2007 1:14 PM User is offline

The radiator/condenser fan needs to be rewired to run whenever the compressor is on. The screeching you heard was probably the belt slipping as the high side went up into the 400's due to no cooling of the condenser.

davegonz on Tue August 14, 2007 1:56 PM User is offlineView users profile

I'll give it a try tonight. Hopefully this is the answer I've been looking for.

NickD on Tue August 14, 2007 3:17 PM User is offline

Hardly seems with only one can of R-134a that the condenser will heat up that quick causing the HP side to skyrocket. Are you using manifold gauges and also looking at the high side?

With all that work mentioned, why was the old compressor replaced? Did the old compressor seize on you? Did you thoroughly flush out the system if this is the case? Were you able to freely hand turn your rebuilt compressor and were you getting suction at the inlet and pressure build up on the outlet? How is your compressor now after that short run? Can it still be easily hand turned? Is the belt tight? Is your receiver R-134a compatible? But gee, those normally last a week or two.

Just questions that you already may know the answers. Is gas still 9 cents a gallon in the outskirts of Caracas and 14 cents inside of the city limits? What about the TV station that showed everyones favorite soap box operas, still demonstrations?

My stepson is still there, his 97 Corolla needs AC work, I didn't get a chance to look at it, but I didn't have any tools, are you good at AC work? He lives in San Antonio. Four years ago, my wife had a new evaporator and receiver installed, told her she should switch off the AC a km before she gets there. I didn't think it was that hot there, would have been if I followed my wife's commandment on closing the window, said some evil person would stick their hand in the window and get me. Just said, if they did, will roll up the window with their arm stuck in it. Either that, or just simply break that arm off. I didn't have any problems.

Oh, you did post the high side pressure, is that at idle or 2,000 rpm? Sure you didn't get lots of air into the system? Always tricky with that first can. Blue hose to the vacuum pump, yellow to the valved off can, and red to the high side for two valve gauges, open the low side and draw a deep vacuum, goes clear to the can valve, close the low side, high side stays open, then open the can valve and heat that can until is near empty. Reconnect as normal, but this time, some refrigerant will leak out rather than a bunch of air leaking back in.

Edited: Tue August 14, 2007 at 3:24 PM by NickD

Chick on Tue August 14, 2007 4:54 PM User is offlineView users profile

Why did you replace the compressor? Did it blow?? If so, did you flush the system?? Most of the insides will be in your condenser, giving you high pressures and will, if it didn't already, blow the reman compressor.. If you had a catastrofic compressor failure, either changing or flushing the condenser is a must..

-------------------------
Chick
Email: Chick

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Freedoms just another word for nothing left to lose

JJM on Tue August 14, 2007 6:47 PM User is offline

Rebuilt compressors other than from ACKits.com will typically do that, seize up right out of the box. We see it all the time. Most rebuilts are just paint pack 'n ship jobs. Either go with a QUALITY rebuilt from ACKits.com or better yet a brand new unit.

100 PSI on the low side points to a bad compressor... either that or the TVX is hollowed out.

I know Chavez hates us (the feeling is mutual), but this is the place to get your parts. Maybe Tim will ship.

Joe

When considering your next auto A/C purchase, please consider the site that supports you: www.ACKits.com




NickD on Tue August 14, 2007 9:21 PM User is offline

Just checked with my wife, no way to ship in any automotive parts into Venezuela, they will end up in Chavez's backyard. Would be nice if I could send parts to my stepson, automotive parts in Venezuela are astronomical in price. She does have connections yet with her American company, but limited to sending something like a CD or a small book, they use a private carrier for that as the mail service is terrible, odds are one in a billion that it would reach the receiver.

It's a shame, I would love to live in Venezuela, such a beautiful country and such ideal weather, ha, lot's of Italians there also with excellent Italian restaurants.

davegonz on Wed August 15, 2007 5:11 PM User is offlineView users profile

OK..first off the truck is orginally from Venezuela. My buddy brought her in when he emmigrated to the US. It now has a Cummins diesel in it and is a sweet truck. The compressor was swapped because it also was giving me a high suction pressure like the new rebuilt one (my buddy gave it to me after having it rebuilt). I am thnking that something is reversed (can something be reversed internally).

NickD on Thu August 16, 2007 6:22 PM User is offline

?????? So are you in the USA or Venezuela? If in the USA, no problem, contact Tim and get a decent one, your compressor was never rebuilt properly if it still has the original problem. If you want to rebuild a compressor, you need a factory with all kinds of specialized machinery. How did your buddy get his vehicle out of Venezuela? I tried various legal means, was next to impossible, illegal means would have cost three times what the vehicle was worth.

davegonz on Mon August 20, 2007 11:21 AM User is offlineView users profile

I'm in Austin, TX.

Anyway, I installed a 10" pusher fan infront of the condensor and was able to suck down 3 cans of R134a. It now gets cold. I need to go pick up a new thermometer to get temp readings at the vent. The pressures are now in line 45/275 psi. I still get a shreak from my engine area, but it's probably the bearing on my tensioner and it also needs a new belt. I'll check back once I button her all up.

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