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Car Forum / Volvo Cars / July 2006

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1989 740 GLE Air Conditioning Compressor Controller

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Ojuice - 08 Jul 2006 06:36 GMT
I am having a problem with my air conditioner compressor only running for a
few seconds then turning off for 15 seconds or so then repeating.  Because
of the short on cycle time, I don't get a lot of cooling.  It doesn't make a
difference if I put the selector on Max air conditioning, Medium, or bilevel
air conditioning, it still cycles on for just a few seconds.   Does the main
computer control the on/off cycle time or is there another control?  I have
enough freon in the system and it seems to work ok except it just doesn't
cool much.  Can I get a schematic for the air conditioning circuit somewhere
on the internet?  Has anyone else had a similar problem?  Thanks.

Dave
Tim.. - 08 Jul 2006 10:24 GMT
> I am having a problem with my air conditioner compressor only running for a
> few seconds then turning off for 15 seconds or so then repeating.  Because
[quoted text clipped - 5 lines]
> cool much.  Can I get a schematic for the air conditioning circuit somewhere
> on the internet?  Has anyone else had a similar problem?  Thanks.

I would virtually guarentee you dont have a full charge of refrigerant with
these symptoms.

Tim..
Michael Pardee - 08 Jul 2006 19:52 GMT
>I am having a problem with my air conditioner compressor only running for a
>few seconds then turning off for 15 seconds or so then repeating.  Because
[quoted text clipped - 8 lines]
>
> Dave

I agree with Tim - those are classic symptoms of low charge.

In the '89 you have an R-12 system unless it has been converted to R-134a.
Ordinary people like us can't buy R-12 any more, but professionals have it
at a very dear price (since the production is prohibited in most of the
world now).

Mike
Jamie - 10 Jul 2006 00:30 GMT
If I recall reading correctly, overcharging the system will also lead
to excessive cycling -- but lack of coolant is the most common cause.

> I am having a problem with my air conditioner compressor only running for a
> few seconds then turning off for 15 seconds or so then repeating.  Because
[quoted text clipped - 7 lines]
>
> Dave
 
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