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Compressor shuts off after thirty seconds

Ammon on Tue April 22, 2014 1:42 AM User is offline

Year: 2010
Make: Saab
Model: 93 turbo
Engine Size: 2.0
Ambient Temp: 70
Pressure Low: 60
Pressure High: unk
Country of Origin: United States

I have a low mileage (12,000) 2010 Saab 93 turbo. It is a hurricane Sandy salvage car. Evidently, it was flooded in the storm surge.

Compressor runs for about thirty seconds after car is started. Then it will shut off. Low side pressure is a little high (about 60 psi). High side pressure is unknown. Compressor has been lubed. It sounds fine when running and starts to blow a little cold air but doesn't run long enough to get very cold.

Any ideas?

Dougflas on Tue April 22, 2014 7:34 AM User is offline

Wht is the high side pressure? You need more info before you can troubleshoot this vehicle. What you have given is like saying to a doctor, "I don't feel well?"

Ammon on Tue April 22, 2014 11:25 AM User is offline

Quote
Originally posted by: Dougflas
Wht is the high side pressure? You need more info before you can troubleshoot this vehicle. What you have given is like saying to a doctor, "I don't feel well?"

Thanks for your response.

Will low high side pressure cause the clutch to disengage after thirty seconds? I don't have a set of gauges but would rather purchase one than spend a lot of money at a shop right now. I checked low side pressure with a cheap refill gauge. I know low pressure can cause the pressure switch to shut the compressor off. I am pretty low on funds because of low work hours. I took it to a shop last week and they said the compressor was locked up. When I looked at it at home, I could see the compressor was working right after I turned the vehicle on. If I listened to the mechanic, I would be paying big bucks for a new compressor right now, which I just can't afford.

Would it be worth my money to buy a gauge from Harbor Freight?

Dougflas on Tue April 22, 2014 1:08 PM User is offline

If your system is a cycling clutch system, if it is low on refrigerant, it will cycle on and off. The suction (low side) will see a low pressure and open the cycling switch thus shutting down the compressor. When the low side pressure reaches above 40 ish, it will close the cycling switch and allow the compressor to run until it reaches the low pressure again. This will repeat.

HECAT on Tue April 22, 2014 1:53 PM User is offline

If you are going to work on it yourself, you are going to (at least) need some basic tooling like this. Without the basic and needed tooling you can stand there and look at it all day; its not going to get fixed.

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mk378 on Tue April 22, 2014 5:03 PM User is offline

Do the condenser fans come on? When the car is sitting still, the high side pressure will rapidly rise while the compressor runs without the fans, and trip the over-pressure protection.

Sounds like an obscure "electrical problem". This is the reason why any car that has been in a flood is automatically totaled.

Ammon on Tue April 22, 2014 11:15 PM User is offline

Quote
Originally posted by: mk378
Do the condenser fans come on? When the car is sitting still, the high side pressure will rapidly rise while the compressor runs without the fans, and trip the over-pressure protection.



Sounds like an obscure "electrical problem". This is the reason why any car that has been in a flood is automatically totaled.

I am suspecting an electrical problem. I will check the condenser fans, Thanks for the tip.

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