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No heat while driving

Discussion in 'Ask An Owner Operator' started by Jabows, Apr 17, 2016.

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  1. Apr 17, 2016 #1
    Jabows

    Jabows Bobtail Member

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    Mar 4, 2014
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    Ok I have a 2010 Prostar with a Cummings engine and just recently i noticed I don't have heat while I'm driving. I have heat only when I'm sitting still. I changed the thermostat but to no avail. Does anyone know what my problem could be? I'm not out of the winter states yet and don't want to freeze while driving down the road. I'm thinking my heater core may be clogged or needs replacing. Thanks in advance.
     
    Jabows, Apr 17, 2016
    Jabows, Apr 17, 2016
    #1
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  3. Apr 17, 2016 #2
    Sux2beu

    Sux2beu Light Load Member

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    Dec 12, 2015
    nowhere which is 10 miles to nothing.
    0
    I would try the heater core. I would look and see it any of the coolant shut off valve are closed.
     
    Sux2beu, Apr 17, 2016
    Sux2beu, Apr 17, 2016
    #2
    Jabows and Getsinyourblood Thank this.
  4. Apr 17, 2016 #3
    peterbilt_2005

    peterbilt_2005 Medium Rare

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    Commie-fornia come visit we have C. A. R. B
    0
    Does your fan switch work?

    Have you added any "leak stop" to your radiator.?

    Any water on passenger floor boards?
     
    peterbilt_2005, Apr 17, 2016
    peterbilt_2005, Apr 17, 2016
    #3
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  5. Apr 17, 2016 #4
    ExOTR

    ExOTR Windshield Chipper Extraordinaire

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    Sometimes the fresh air vent gets stuck open as well. Will be warm at low speeds, gets consistently cooler as speed increases. If you shut off the fan motor is cool air still blowing through the vents?
     
    ExOTR, Apr 17, 2016
    ExOTR, Apr 17, 2016
    #4
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  7. Apr 17, 2016 #5
    daf105paccar

    daf105paccar Road Train Member

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    first step:feel the 2 lines going to the heater core.
    When your engine is hot at least 1 line should be very warm.
    Easy and the cheapest.
    Come back and tell us what you felled.
     
    daf105paccar, Apr 17, 2016
    daf105paccar, Apr 17, 2016
    #5
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  8. Apr 17, 2016 #6
    S M D

    S M D Road Train Member

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    sacramento ca
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    They dont make cummings with that being said

    Cover the grill with cardboard and see what that does.
     
    S M D, Apr 17, 2016
    S M D, Apr 17, 2016
    #6
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  9. Apr 17, 2016 #7
    77fib77

    77fib77 Road Train Member

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    Check the cut off valve going to the cab. Mine looks like a house garden hose valve. Mine was so old it would spin shut. I zip tied it open.
     
    77fib77, Apr 17, 2016
    77fib77, Apr 17, 2016
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  10. Apr 17, 2016 #8
    EZ Money

    EZ Money Road Train Member

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    0
    I don't think the ProStar has a cutoff valve...
    My old 2011 did not and it had the Cummins in it.

    Heater core or broken actuator on the fresh air or cold-hot blend door is possible.
    Checking the hoses for heat at the fire wall is the first test!
     
    EZ Money, Apr 17, 2016
    EZ Money, Apr 17, 2016
    #8
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  11. Apr 17, 2016 #9
    Jabows

    Jabows Bobtail Member

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    Mar 4, 2014
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    I actually added some leak stop last year. It stopped the radiator leak instantly. I was wondering if me doing that clogged or messed up my heater core. My fan switch does work in all positions. Low to high it blows strong.
     
    Last edited: Apr 17, 2016
    Jabows, Apr 17, 2016
    Jabows, Apr 17, 2016
    #9
  12. Apr 17, 2016 #10
    Jabows

    Jabows Bobtail Member

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    Mar 4, 2014
    0
    I had the blend door replaced about 2 years ago when I first got the truck. The blend door does still work as I go from hot to cold it adjusts accordingly.
     
    Jabows, Apr 17, 2016
    Jabows, Apr 17, 2016
    #10
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