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What is the cause of this? I have a 94 Volvo 850 turbo and my heat stops working when it is under 45 f outside, but blows beautifully in temperatures above 45. Also my ac doesn't blow cold air and whe

I bought this car almost 2 years ago from a guy who had it for 13 years. It has always been regularly maintenanced. He told me that he had a mechanic look at it and he thought it was some ac switch but he just never got it fixed. The ecc lights also flash for a few secs after turning car on but I do know this is because there's a problem somewhere. Please help me figure this one out!

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  • Rachelle Jan 01, 2015

    I'd like to add that my volvo has auto control and is not manual, I realize that I shouldn't have mentioned the heat problem and the ac problem in the same question. I did just in case of any possible problematic relations. Now, I should have asked this before, too, the dash cluster doesnt all work and the temp guage is a part of that. So, I womder, does the guage not working have anything at all to do with the heat not working when its less than 45° ? Or, possibly affect the temp sensors?

  • steve Jan 01, 2015

    Hi Rachelle,the dash cluster may well be a seperate issue to the heating problem, i would check the interior fuse box as there is usually a fuse for the instrument panel ,this would not cause the heating issue's you posted about in Nov, have you checked the ENGINE TEMP SENDER and the THERMOSTAT are operating correctly , as for the A/C the first thing to do is get the gas pressure checked as just may need re-gassing ,keep me posted if you wish and Happy New Year



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I would check thermostat and coolant levels , My wife had a 2003 impala that would not heat when it got cold , I changed the thermostat and coolant , and problem solved . I am pretty sure it is your problem . Good Luck , Hope this helps !!!!!!!!!!!!!!!!!!

Posted on Nov 15, 2014

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Sounds like the temp sender could be misreading or the thermostat might not be opening fully, so i'd get that checked , th a/c may need regassing , keep me posted if you wish

Posted on Nov 15, 2014


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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Sounds like you are either low on coolant, or a head gasket failure.

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SOURCE: Temperature Control not working on 1999 Ford Explorer

Sounds like your temperature actuator is not moving or your temp door is broken. On max a-c ,coolant is shut off to your heater core allowing only cold air in.

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SOURCE: 2007 Dodge 2500 Mega Cab No Heat, AC, Defroster, Vent fan

possible faulty heater resistor block or control head

Posted on May 10, 2009

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SOURCE: 2002 New VW Beetle is only blowing hot air out of

Ok, here is the scoop on this. if you sit in the passenger seat and reach under the dash in the center of the vehicle. So your laying in the passenger side of the vehicle and placing your right hand on the floor board were passengers feet would go, slightly to the left of there is where the carpet raises up to the center hump behind the button for emergency flashers. Ok there you will see or feel a plastic small arm attached to a wire rod. this plastic arm is most likely broke or like mine the its worn, so push it back inside the small hole, while turning the heat switch from cold to hot. All this little arm does is open and close the heat vent, but also allows the air conditioner to fully turn on. As you turn the heat switch you will see, or notice it catches the mechanism and the heat will switch on or the air will come on as you turn the switch. I had only a few minutes left to short fix this so I opted to glue the darn thing in place, yes a quick fix but its working and after only looking and poking around I now know what this is so when I have time i can fix it. My own mechanic whom I trusted for years said look its the heater box major repair. I know he doesn't care to work on Vw's its all good but it cost almost nothing to repair this badly designed item. I was ready to sell as is and take the hit but waited one more day when I could find my good flashlight and just refused to believe I had to take off the dash. So dont go to dealer unless you have the time and you point out whats wrong, they also said it was both the air compressor and a cracked heat box? find and locate it yourself I don't have a warranty on this 2002 1602,000 mile car, but I keep it running with good maintenance and all you who are kind enough to keep us all updated on your finds.

Posted on Apr 07, 2011

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SOURCE: AC will blow cold air for a few minutes then start

you have moisture in the system this causes your expancion valve to freeze up an stop working, thats why it works for sort time and when it de-freezes stars working again. you need to do a EVAC & RECHARGE with a good AC service equipment, specially attention to pull vacumm por at least 20minutes so you get all moisture out of the system.
Good luck

Posted on Jun 05, 2011

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