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#1
05-31-2007, 01:19 PM
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240d A/c Problem
Ok so im new to a/c repair but... i have checked the charge in my car it is up to spec. Borrowed my dads a/c sniffer that detects leaks and there were none. However my 240 with its manual c.c. seems to turn the compressor on and off at will. When the a/c works it will freeze you to death then all of a sudden, ehh, not so cold I stomp the accelerator the wow hey its back, nice and freezing I can even sit outside the car and watch the compressor do this. remember suposed Good charge. My father thinks its my expansion valve sticking, PLEASE ANYONE HAVE A CLUE??
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#2
05-31-2007, 01:40 PM
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I don't think the expansion valve will cause the compressor to cycle. My first guess would be the pressure switch on the dryer. Try jumping these contacts together and see if it still cycles. If that fixes it, you either have a bad switch or the pressure is actually low.
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#4
05-31-2007, 01:54 PM
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there is also a low pressure/temp switch on the evaporator to keep it from freezing up. it may also be bad, or indicating a low freon charge.
John
__________________
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 190D 2.5Turbo 1987 190D 2.5-5SPEED!!!  1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#5
05-31-2007, 03:12 PM
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Thanks again
Wow, Thanks you guys it seems it is that switch on the dryer is the culpret I connected the two wires and drove it about two miles everything good ice cold a/c even on this 134 stuff. THANKS AGAIN !!! I think im going to have the system evacuated and relace the common switches then have her recharged.
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#6
05-31-2007, 03:16 PM
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just bypassing the switch does not find the problem, the switch may be working properly. you may be low on refrigerant. before you evac, have it serviced and see what pressure the system is dropping out. it may not need switch replacement.
John
__________________
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 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#7
05-31-2007, 04:21 PM
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Quote:
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