1989 740 GLE Air Conditioning Compressor Controller

  • Thread starter Thread starter Ojuice
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Ojuice

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
 
Ojuice said:
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.
Click to expand...

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


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