Question about 1993 Volvo 940

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93 volvo - AC works sometimes - not at others

I dont know if its related - but since the temp here (Alabama) has gotten up to about 100 - my AC works sometimes - and at others doesnt - (When it does its very cool) - I can even be driving down the road - and suddenty it will start working.... Any ideas - Thanks!!!!

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CHECK THE TEMP CONTROL UNIT. REMOVE IT FROM CAR. OPEN BACK OF UNIT U WILL FIND
A CIRQUIT BOARD. USE A MAGNIFAEING GLASS TO INSPECT ALL SOLDER CONTACTS.THEY TEND TO BREAK LOOSE SOMETIMES FOR DIFFERENT REASONS.WHEN YOU HIT A BUMP ON THE ROAD OR TEMPERATURE CHANGES IT LOSES CONTACT OR RECONECTS AND THEN IT WORKS AGAIN.OLSO U CAN USE A TESTER ON OHM SETTING TO CHECK CONTINUITY.
RESOLDER BAD CONTACT GENTLY OF COURSE. IT IS A PIECE OF CAKE.

Posted on Oct 14, 2008

  • Skrausz676 Oct 14, 2008

    OLSO MAKE SHURE THAT YOU HAVE FREON IN THE RIGHT PRESURE RANGE.

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I had this problem and it was not the blower motor which would be obvious because you will either not have any air blowing or it will sound like a strangled sheep under your passenger side dashboard.
My solution was a new dash control unit for about $200. The solders on the back side were all deteriorated on my 95 volvo 940 and the connection was coming in and out. A very careful soldering person might just fix it, but I opted for the new panel because it was easier.

Posted on Sep 08, 2008

Mine was like that, after replacing blower motor ordered from autozone, works like brand new.


Posted on Aug 16, 2008

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