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a/c freezing up at firewall 850 1995

posted by  Rockytop on  Wed Aug 15 10:30 CST 2007
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last visit: Tue May 10 13:59 CST 2011
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(repeat post from Monday)
A/C was freezing up at firewall. The only a/c service in last 3 years was a "recharge" by a local "filling station." I put gauge on low side and it seemed high (lower 40's). It would drop only to about 25-26 after more than 20 min.(never cycling off) at around 85 degrees.
I swapped the pressostat from a known good one (my 850) with same results. I assume it was overcharged? If so, is there a way to correct this without evacuation/recharge? Will "venting" a few seconds work?
--
Two 1995 854 GLT's (w/ manual transmissions)








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    a/c freezing up at firewall 850 1995

    posted by  someone claiming to be fixit2003 on  Tue Aug 28 03:58 CST 2007 [RELATED]

    For 850 ac info: au.geocities.com/ozbrick850/aircon-KeithP.html








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    a/c freezing up at firewall 850 1995

    posted by  someone claiming to be bobcat on  Tue Aug 28 03:16 CST 2007 [RELATED]

    If it isn't cycling off and it is freezing the firewall, then you have a pressure switch issue. I am assuming that is the pressostat you mentioned? If you feel the switch is good, then it may be an electrical issue from the switch to the system. If you had it recharged 3 years ago and now it started freezing the firewall, I would say you don't have an overcharge issue. When the compressor never cycles off, then the charge keeps cooling until is freezes the system. It cycles off to let the temp rise some.








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    a/c freezing up at firewall 850 1995

    posted by  jean-philippe gauthier on  Tue Aug 28 00:14 CST 2007
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    last visit: Thu Oct 1 14:55 CST 2009
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    If it was overcharged, you have to remove some. I think venting r134a in the atmosphere is against the law pretty everywhere (it is a strong greenhouse gas).

    If you are sure the sensors are not the cause, i would check the pressure in the system to know if it is overcharged.

    good luck!







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