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heater problems - help!

This is a discussion on heater problems - help! within the General Help forums, part of the LSx Technical Help Section category; My heater only seems (but works fine) to work when the car is moving (engine above idle speed). 1. replaced ...

  1. #1
    2xSOM ninety6's Avatar
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    heater problems - help!

    My heater only seems (but works fine) to work when the car is moving (engine above idle speed).
    1. replaced heater core
    2. replaced thermostat
    3. Replaced water pump
    4. had the system flushed (chemical flush to remove gunky)

    any possible way this could be the coolant temp sensor or vaccum line? Coolant just doesn't seem to flow enough when the car is idling to warm the heater core. Even when the car is warm, and has been warm, stopping at a red light often stops the heat (not the AIR, the just WARM air).

    Not sure how sensor or vacuum line would be engine speed related, but any suggestions would be appreciated!

    Thanks!

  2. #2
    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    Quote Originally Posted by ninety6 View Post
    My heater only seems (but works fine) to work when the car is moving (engine above idle speed).
    1. replaced heater core
    2. replaced thermostat
    3. Replaced water pump
    4. had the system flushed (chemical flush to remove gunky)

    any possible way this could be the coolant temp sensor or vaccum line? Coolant just doesn't seem to flow enough when the car is idling to warm the heater core. Even when the car is warm, and has been warm, stopping at a red light often stops the heat (not the AIR, the just WARM air).

    Not sure how sensor or vacuum line would be engine speed related, but any suggestions would be appreciated!

    Thanks!
    Not real sure on this one! Check to see if there is an inline valve going to the heater core.

  3. #3
    2xSOM ninety6's Avatar
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    Quote Originally Posted by 9t8z28 View Post
    Not real sure on this one! Check to see if there is an inline valve going to the heater core.
    there is. i have thought about replacing it, but that will probably require also replacing a hose... i need to feel the hoses again and see if where its not flowing??

  4. #4
    Senior Member Danger731's Avatar
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    So the HEAT comes back on if you leave it in neutral and raise the RPM's ?

  5. #5
    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    I wound up just replacing it with a plain hose. It worked fine on my 97. If it is blocked, pressure might not even reach the hose.

  6. #6
    2xSOM ninety6's Avatar
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    Quote Originally Posted by Danger731 View Post
    So the HEAT comes back on if you leave it in neutral and raise the RPM's ?
    yes! you are correct.

  7. #7
    2xSOM ninety6's Avatar
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    Quote Originally Posted by 9t8z28 View Post
    I wound up just replacing it with a plain hose. It worked fine on my 97. If it is blocked, pressure might not even reach the hose.
    I have thought about doing that as well... did you just get generic hose, or did they have one custom fit for that application?

  8. #8
    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    No. I got heater hose from my work. Generic hose will not tollerate the heat.

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