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Thread: Heater Problem

  1. #1
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    Default Heater Problem

    2002 V70 XC 134,000 miles. New transmission.

    When I start my car in the morning, the heater doesn't work. Or, I should say the fan doesn't blow. This has been going on for a month or so, off and on. If my car has been sitting in the sun for several hours, the heat comes on full blow. Also, I have had to add coolant. Could be unrelated but the add coolant, stop engine now message just came on again. Any ideas? It's really cold here in KC and I need more heat than just in the seats!

  2. #2
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    I reckon they're separate issues. Assuming that your system is functioning correctly (they won't blow if you've asked for heat and the engine is cold...they start as the engine warms up. Defrost will blow full as soon as it's selected...) - then it's likely your blower fan in need of lube if it works fine when warm...

    And you've got a coolant leak.

    I don't have experience with either one...so I am sure some more senior folks will pitch in...but lubing the blower is not hard - it's behind the glove box...then chase down that leak. And top off with only the Volvo blue-green...
    Current Fleet:
    2006 Corolla (kid's car - 140K, Eco Contacts, Castrol Edge 5W30)
    2005 MB S600 (76K, Michelin AS3, M1 0W40)
    2002 V70-XC (179K, AltiMax RT43, Pennzoil Ultra 5W30)
    2002 V70-T5 (165K, IPD bars, Bilsteins, Conti PureContact, Mobil 1 0W40)
    1992 MB 300E (Sportline - 145K, Yokohama Avid, Liqui Moly 5W40)
    1990 4-Runner (V6, 4WD, mild lift - 252K, 31" BFG AT KO, QS 10W40 syn)
    1932 Packard Sedan (straight 8, dual sidemount spares, original paint and interior, Shell Rotella 15W40)

  3. #3
    Art's Avatar
    Art is offline Super Moderator & VolvoXC.com Supporter
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    Default

    Quote Originally Posted by mschiesl View Post
    2002 V70 XC 134,000 miles. New transmission.

    When I start my car in the morning, the heater doesn't work. Or, I should say the fan doesn't blow. This has been going on for a month or so, off and on. If my car has been sitting in the sun for several hours, the heat comes on full blow.
    It's possible that the blower issue could be related to the cabin temp sensor. ie the pulse value for the blower motor does not match that of the temp sensor. For a start, check the vent grill for dust bunnies that might be blocking the sensor's fan motor. The vent is located just above the passenger side temp knob. An easy way to see if the fan is functioning is to place a thin piece of tissue up against the grill. If it is sucked towards the vent then it's working. The sensor fan only works if the cabin temp is higher than 14 F.

    There's an informative thread discussing the separate components of the temp sensor in the link below:

    http://www.volvoxc.com/forums/showth...erature+sensor

  4. #4
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    I recently had a similar issue and turned out to be the coolant thermostat. The failing thermostat was causing the following

    - mysterious loss of coolant and no leak anywhere in the system. I guess the failing thermostat must caused some excess purge. After thermostat change, no more coolant loss

    - engine temperature gauge doesn't look normal. The needle is usually just about right in the middle on this car. When thermostat failed, it would be further to the left (cooler) quite often.

    - ECC cabin temp would not get hot until max. My ECC temperature sensor fan was working so that wasn't the issue.

    I was surprised a bad thermostat could cause all of this. If you have some of these symptoms, you might just replace the thermostat. But if your heater fan is not turning on. Thats something else. Perhaps jammed ECC cabin sensor fan as noted by Art.
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  5. #5
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    mysterious loss of coolant and no leak anywhere in the system. I guess the failing thermostat must caused some excess purge. After thermostat change, no more coolant loss
    No.

    Dave.
    Our Most Probable Fate Is Death !!!

  6. #6
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    Default

    Quote Originally Posted by mschiesl View Post
    2002 V70 XC 134,000 miles. New transmission.

    When I start my car in the morning, the heater doesn't work. Or, I should say the fan doesn't blow. This has been going on for a month or so, off and on. If my car has been sitting in the sun for several hours, the heat comes on full blow. Also, I have had to add coolant. Could be unrelated but the add coolant, stop engine now message just came on again. Any ideas? It's really cold here in KC and I need more heat than just in the seats!
    How much coolant have you had to add? Have you checked under your driver's side floor mat to see if your heater core is leaking? Any evidence of a leak anywhere else?

    2001 V70 XC
    133,000 miles. New Transmission at 73,000 miles.
    Chassis #002481

  7. #7
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    I also had a coolant loss. Id top up and a week later the DIM would say "Coolant Level Low Stop Engine ASAP" Check under your bumper, mine was wet but it never dripped unless it stood for 2 or more days. But the leak stopped, don't ask me how but I'm happy. If it's leaking very little I'd hold off and see if it continues
    2001 V70XC (132K)
    1993 940 (247K)
    2002 S60 T5M (200K)

  8. #8
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    Feb 2011
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    Kansas City
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    Default

    Thanks, friends. I will take your advice. I haven't seen any coolant leaking out. Will follow your lead on a thermostat... and a dust bunny remover.

  9. #9
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    Feb 2011
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    Kansas City
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    Coolant leak? I put in Prestone coolant...probably shouldn't have. Gotta go to the dealership and get Volvo coolant. No leaks, snow under car would prove a leak and it's not there. Aren't our cars fun?

  10. #10
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    Default Chemistry

    Prestone isn't compatible. Nearly all brands of coolant use ethylene glycol to achieve the lowered freezing point and increased boiling point, but there are several different chemical bases for the rest of the coolant. The Volvo blue-green, like many European manufacturers, uses an organic acid technology. Prestone is conventional and often has silicates. Part of the reason Volvo water pumps last so long is the coolant formulation. Mercedes uses the same chemical base, but it's straw colored.

    Mixing the two formulations can lead to the formation of precipitates or even gel in the cooling system...

    So, no, you probably shouldn't have added the Prestone...as ridiculously priced as the Volvo Blue-Green is, it takes only one gallon to refill the system after completely draining it. Oddly enough, M-B charges about $17/gal for their coolant, Volvo nearly $30...so, Mercedes charges half...

    When you find the leak and fix it, consider draining the system (you can flush with clear water) and refilling it with the correct stuff.

    Lest you think I am crazy about the gel formation, here's a guy who had that problem with his MB: http://www.bobistheoilguy.com/forums...Number=2152274
    Current Fleet:
    2006 Corolla (kid's car - 140K, Eco Contacts, Castrol Edge 5W30)
    2005 MB S600 (76K, Michelin AS3, M1 0W40)
    2002 V70-XC (179K, AltiMax RT43, Pennzoil Ultra 5W30)
    2002 V70-T5 (165K, IPD bars, Bilsteins, Conti PureContact, Mobil 1 0W40)
    1992 MB 300E (Sportline - 145K, Yokohama Avid, Liqui Moly 5W40)
    1990 4-Runner (V6, 4WD, mild lift - 252K, 31" BFG AT KO, QS 10W40 syn)
    1932 Packard Sedan (straight 8, dual sidemount spares, original paint and interior, Shell Rotella 15W40)

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