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'93 Volvo How do these numbers look?

wrenwright on Thu April 23, 2009 6:45 PM User is offlineView users profile

Year: 93
Make: Volvo
Model: 240
Engine Size: 2.3
Refrigerant Type: R-134
Ambient Temp: 89
Pressure Low: 21
Pressure High: n/a

I'm checking out the a/c in a newly-acquired Volvo 240 wagon. It's a '93 model and has the improved 9/740 style accumulator system.

I'm fairly familiar with the older drier systems used in these cars having completely replaced the system in my '83 model, but not so familiar with this one.

When I got the car, it had not been driven for a couple of years and while there was about 40 psi in the system when the engine wasn't running (low side) , the a/c wasn't engaging and when I hot-wired the compressor to check things, the low side went to 0. I put one can of DuPont R-134a in the system and now have these numbers.

Here's is what I'm getting:

Ambient: 89
Vent Temp: 41
Low Side: 21 while the compressor is cycling. When it switches off, it climbs to 41 and then it kicks back on. It will run for about 45 seconds or so and then cut off and turn back on fairly quickly as the pressure rises.


I can't check the high side as there isn't a port provided.

Thanks!




Edited: Thu April 23, 2009 at 6:52 PM by wrenwright

JACK ADAMS on Thu April 23, 2009 7:48 PM User is offline

You will need to check for leaks. The system is doing what they call quick cycling. The system is low on refrigerant and the compressor is cutting off do to low pressure. You will need to find the leak, repair evacuate the system and then charge to the OEM specifications. Make sure you have a good set of Refrigerant Gauges to do the service.

Chick on Thu April 23, 2009 8:23 PM User is offlineView users profile

Check in front of the radiator on the right side of the vehicle for the high side port, might have to grab it from under the car if it's there.. look close..hope this helps..

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

wrenwright on Fri April 24, 2009 1:40 AM User is offlineView users profile

Thanks, guys.

Jack, what sort of numbers should I be seeing if the system is charged completely? How does one tell the difference between "quick cycling" and normal operation? My compressor isn't cycling on and off as I'm familiar with when a system is low, it stays engaged for about 30 seconds or so before it cycles off.

Chick, I'll check for that high side port you mentioned and post back the gauge readings if I find it.



Edited: Fri April 24, 2009 at 1:41 AM by wrenwright

JACK ADAMS on Fri April 24, 2009 11:54 AM User is offline

Here is a link for the R-134a PressureTemperature Relationship . Hope this helps.

Chick on Fri April 24, 2009 3:34 PM User is offlineView users profile

If you can't find a high side on that car, there are sometimes ports on the rear of the compressor, and an R12 hose fits. I couldn't find a 240 in the yard, but did have a compressor, so check out the pic and you'll see what I mean, and it does appear your car is low. If need be, recover the refigerant and recharge by weight. High side pressures would be nice though.. Hope this helps..





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

---------------------------------------------

Freedoms just another word for nothing left to lose

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