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1989 740 GLE Air Conditioning Compressor Controller

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

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

Tim..

Reply to
Tim..

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

Reply to
Michael Pardee

If I recall reading correctly, overcharging the system will also lead to excessive cycling -- but lack of coolant is the most common cause.

Ojuice wrote:

Reply to
Jamie

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