how do you make the air compressor runl onger and turn off for shorter periods of time? is it situated on the expansion valve?

no ideas?

I suspect you could undercharge the system with refrigerant to accomplish this but for the life of me I can't understand why?

I've never seen an adjustable expansion valve.

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Sam

84 300SD 350K+ miles ( Blue Belle )

If the compressor is disengaging when it shouldn't, the evaporator low temp cut out switch might be the problem. It is intended to prevent the evaporator from freezing, but they sometimes malfunction and actuate at a much-to-high temperature.

Any idea what model car you are dealing with?

Cervan,
What year and model. There can be different ways/ different models.

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The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)

well my father insists that there is an ajustment that will tell the compressor when and how long to run is this all done automatically? sorry my car is a 1981 240d

Is there a particular problem that you are trying to solve?

the compressor is turning off abit too early i want the compressor to run longer when it is running and the wait time between runs to be shorter ( i live in california very hot out here doubt i can ice the evaporator over)

Thanks to JimmyL I now know that we are talking about a 240D. It would be helpful to know what year.

He finally informs us in post #6, but still hasn't updated sig. That ought to be mandatory during the sign up process.....

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Jimmy L.
'05 Acura TL 6MT
2001 ML430 My Spare

Gone:
'95 E300 188K "Batmobile" Texas Unfriendly Black
'85 300TD 235K "The Wagon" Texas Friendly White
'80 240D 154K "China" Scar engine installed
'81 300TD 240K "Smash"
'80 240D 230K "The Squash"
'81 240D 293K"Scar" Rear ended harder than Elton John

And how many times to we see multiple models listed in a signature and still have no idea which one is the subject vehicle?

I would start by checking pressures and making sure that you have a correct charge. You can then determine correct pressure switch pressures and check the switches while gauges are connected.

Exactly.
You need to do the basics first before you start throwing parts and money at it.
When everything is working right you wouldn't need to "adjust" the expansion valve.

..
It should also be mandatory to read the sticky's first. Larry, maybe you can edit this one to tell everyone to add info to their signatures.
http://www.peachparts.com/shopforum/showthread.php?t=127342

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1984 300SD Turbo Diesel 150,000 miles

OBK member #23

(\__/)
(='.'=) This is Bunny. Copy and paste bunny into your
(")_(") signature to help him gain world domination

Unless the car has been modified, the only pressure switch involved is the low pressure cut-off switch. How likely is it that the high pressure side pressure would decrease while the compressor was operating?

However, if the car has been converted to R-134a and a dual acting pressure switch was installed, the described condition could easily be related to the refrigerant level.

even if not upgraded, low pressures could drop coil temps... so charge verification is manditory.
John

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!