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heater not hot

This is a discussion on heater not hot within the General Help forums, part of the LSx Technical Help Section category; my heater just isn't pushing out the hot weather it used to...is that a stuck t-stat?. i have a stock ...

  1. #1
    Detailing + Design third_shift|studios's Avatar
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    heater not hot

    my heater just isn't pushing out the hot weather it used to...is that a stuck t-stat?. i have a stock t-stat on a 2000 ls1

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    Slow'er'Ass Mr. Luos's Avatar
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    Turn it over to the red part.

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    Quote Originally Posted by Mr. Luos View Post
    Turn it over to the red part.

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    Flush the radiator.

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    Junior Member greenvilleTA's Avatar
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    Is it over heating or is the temp. normal? If the tstat was stuck, you would most likely overheat or see an elevated temp. I'd start the car while cool, then take the radiator cap off while still cool, and as it warms up, you should see the fluid level slightly drop and see fluid pumping through radiator passages visible with the cap off. If after completely warm the water is barely moving, probably stuck tstat...if not circulating at all, maybe waterpump. Since tstat is cheap and a 5 minute replacement, I'd start there.
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    Veteran 0rion's Avatar
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    Take the cap off the radiator when it's cold and start it up. If the coolant immediately starts circulating then your t-stat is stuck open. I would look at that first then reverse flush the heater core if it's not the t-stat. I've ran into both situations in the last 2 months on different vehicles. Both have pretty much the same symptoms. The heat will get warm but not hot and takes a long time to get warm.

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    Slower Than a 3rd Gen juiced99ws6's Avatar
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    Quote Originally Posted by 0rion View Post
    Take the cap off the radiator when it's cold and start it up. If the coolant immediately starts circulating then your t-stat is stuck open. I would look at that first then reverse flush the heater core if it's not the t-stat. I've ran into both situations in the last 2 months on different vehicles. Both have pretty much the same symptoms. The heat will get warm but not hot and takes a long time to get warm.


    crappy thing about the f body i syour gauge wont tell you if your car is running colder than normal.

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    Member Allen Wood's Avatar
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    Check the coolant/water level. No liquid no heat.

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    Slower Than a 3rd Gen juiced99ws6's Avatar
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    no liquid= LOTS of heat

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    Detailing + Design third_shift|studios's Avatar
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    thanks, i'll have to report back after i do some testing tomorrow

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    Detailing + Design third_shift|studios's Avatar
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    Quote Originally Posted by 0rion View Post
    Take the cap off the radiator when it's cold and start it up. If the coolant immediately starts circulating then your t-stat is stuck open. I would look at that first then reverse flush the heater core if it's not the t-stat. I've ran into both situations in the last 2 months on different vehicles. Both have pretty much the same symptoms. The heat will get warm but not hot and takes a long time to get warm.
    i took of the cap, started the car and didn't see any liquid at all? am i really low on coolant? or is it so far down that it's too dark to see w/out a light?

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    Member Allen Wood's Avatar
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    There could be enough water to keep the engine from over heating but not enough to provide heat. I should have said the coolant level could be low and this will cause the heater not to put out any hot air.

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    Veteran 0rion's Avatar
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    I would definitely top it off. Sounds like you're just really low on coolant. Leave the cap off and keep topping it off until it's full and that'll purge any air out of the system. Make it a habit to start using the overflow reservoir and keeping an eye on it. That'll keep you from running so low.

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    Detailing + Design third_shift|studios's Avatar
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    i guess i have a slow leak. seems like every 6 months i have to top it off.

    so do i pour into the radiator or the overflow tank?

    I would pour it into the radiator until that's almost full and let the car come up to temp ( the level will rise as it comes up to temp), then let it run a bit to flush any air that might be in the system out ( 5-10 min), put the cap back on and let the car come completely up to temp, and fill the resevoir up to the "full when hot" mark.
    Last edited by 0rion; 03-04-2007 at 06:52 PM.

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    Slower Than a 3rd Gen juiced99ws6's Avatar
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    Quote Originally Posted by Allen Wood View Post
    There could be enough water to keep the engine from over heating but not enough to provide heat. I should have said the coolant level could be low and this will cause the heater not to put out any hot air.
    i was just busting your chops.. it just came out funny and was too good to resist.

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    Quote Originally Posted by third_shift|studios View Post
    i guess i have a slow leak. seems like every 6 months i have to top it off.

    so do i pour into the radiator or the overflow tank?

    I would pour it into the radiator until that's almost full and let the car come up to temp ( the level will rise as it comes up to temp), then let it run a bit to flush any air that might be in the system out ( 5-10 min), put the cap back on and let the car come completely up to temp, and fill the resevoir up to the "full when hot" mark.
    Into the rad. and then just top off the over flow every couple weeks.

    And last but NOT LEAST GO TO SKYLINE AND EAT 4 3-WAY FOR ME!!!!
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    Veteran 0rion's Avatar
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    Well, not sure what happened to my last post. It never showed up.

    Fill the radiator almost full but leave a little room because the level will rise as the car heats up. After it runs a while and the coolant is circulating let it run a bit (5-10 min) to flush any air out that may be in there. Put the cap back on and let the car run a bit to get good and hot and fill your reservoir then.

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    Detailing + Design third_shift|studios's Avatar
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    Quote Originally Posted by LS2Tuner View Post
    Into the rad. and then just top off the over flow every couple weeks.
    that doesn't make any sense; to fill both the radiator AND the overflow?

  19. #19
    Veteran 0rion's Avatar
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    What he's saying is to fill the radiator now then check back and top off the overflow every couple of weeks. What happens is that as the water gets hot and expands it's pushed into the overflow tank. That's why after this intial fill you fill at the overflow and only when the car is hot, so it doesn't push water out of the overflow.

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    Quote Originally Posted by 0rion View Post
    What he's saying is to fill the radiator now then check back and top off the overflow every couple of weeks. What happens is that as the water gets hot and expands it's pushed into the overflow tank. That's why after this intial fill you fill at the overflow and only when the car is hot, so it doesn't push water out of the overflow.
    Thank you Sir for explaining it in plain english.

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