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Truck not heating well

Discussion in 'Mechanic's Corner' started by davbell22602, Feb 28, 2020.

  1. davbell22602

    davbell22602 Stihl Chainsaw Man

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    2004 f350 5.4l doesnt heat when temperatures drop below 40 degrees. Truck has no cabin filter.

    Co worker said it could be a water pump and thermostat.

    What do you guys think on what it is?

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    Last edited: Feb 28, 2020
  2. OldCracker29

    OldCracker29 I've been knocked down drug out and left for dead

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    It could be low on coolant as well.
     
  3. davbell22602

    davbell22602 Stihl Chainsaw Man

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    It's full of coolant.

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  4. PenguinLTZ

    PenguinLTZ Administrator Staff Member

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    Thermostat is very likely, but when was the last time the coolant was flushed? Coolant starts to drop out solids when it is old, or mixed improperly. The congealed solids collect in the heater core, radiator, etc.
    Coolant is often the most overlooked maintenance item in every truck.
    If it were me, and I had a 17 year old truck north of 100K, it would get a really good flush, with a 2 part chemical, a water pump, and a thermostat. If it was my daily driver, the hoses would get replaced, too.
     
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  5. davbell22602

    davbell22602 Stihl Chainsaw Man

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    Ok thanks. Truck has 201k miles.

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  6. Black02Silverado

    Black02Silverado Sponsor

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    Very good info. The other item that gets overlooked is the power steering fluid and differential fluid.
     
  7. davbell22602

    davbell22602 Stihl Chainsaw Man

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    Update

    Replaced water pump, fan clutch, tstat, blend door actuator switch, and flushed radiator 3 times. Now no heat while driving but have heat when idling for 10min or longer. Heater core and radiator is left to be replaced. Truck not equipped with the heater valve.

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  8. davbell22602

    davbell22602 Stihl Chainsaw Man

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    Problem resolved:

    Heater core fixes it.

    Winner winner chicken dinner

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  9. OldCracker29

    OldCracker29 I've been knocked down drug out and left for dead

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    Was the old one clogged or leaking?
     
  10. davbell22602

    davbell22602 Stihl Chainsaw Man

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    I wanna say clogged cause I couldn't hear circulation from it in the cab.

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