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Thread: Heater Doesn't Get Hot...

  1. #1
    Join Date
    Jan 2007
    Location
    NYC
    Posts
    30

    Default Heater Doesn't Get Hot...

    Hi Guys, time for my semi-regular mystery challenge to the group. ;^)
    I have a 2000 HSK.

    It's getting cooler here in CT and I went to turn my heater on the other evening and got only cool air. I'm not leaking fluid either from the radiator, engine or inside the cabin from the heater core itself. The level seems to be where is is supposed to be when the engine is cool. The fan works, all of the different air routing configurations work, and 'AUTO' works.

    I recently had the intake manifold gasket replaced this summer, and I was wondering if they might have done (or not done) something to cause this problem. As some of you may recall, shortly after the repairs were done, (about a week or so) the 'check engine' light came on. Nothing has changed in the engine's performance, and I'm presuming it might be the O2 sensors asking to be replaced or cleaned, but as I said, there has been no negative effect on the engine's performance. However, might this be a clue?

    I do notice one peculiar thing: As I'm driving along, with cool air blowing on me, when I make a sharp turn, I get the hint of warm air for a second, and then it returns to the cool air. It's like, 'Oh, here it finally comes...' and then nothing. Very odd... Perhaps it's some programing thing? I don't know, but I thought I'd start here for suggestions, and to see if this is a garden variety problem with this make/model, before I take it to a service person.

    Thanks in advance,

    Den Gleason/Connecticut
    'Maybe the 'Hokey-Pokey' really is what it's all about.'

  2. #2
    Join Date
    Feb 2009
    Location
    Cincinnati
    Posts
    130

    Default

    Sounds like who ever did your work, didn't bleed the system and you have an air pocket in the cooling system.
    Joey
    97 Disco
    10 MCCSm
    Custom Rover Accessories
    Home of the D2 horn buttons

  3. #3
    Join Date
    Jan 2007
    Location
    NYC
    Posts
    30

    Default didn't bleed the system...

    Ohhhh, that sounds promising. Are you suggesting that this is something I might (might, mind you) remedy the problem with, by draining my cooling system and refilling it? (fingers crossed!)
    'Maybe the 'Hokey-Pokey' really is what it's all about.'

  4. #4
    Join Date
    Feb 2009
    Location
    Cincinnati
    Posts
    130

    Default

    Park with the rovers front end in the air say a steep driveway or bank.

    Open the radiator reservoir and fill as needed, close it and start the engine with the heater on when it starts to warm the engine up, shut down let it cool refill reservoir as needed repeat till it does not require a fill up and the heater is working.
    Joey
    97 Disco
    10 MCCSm
    Custom Rover Accessories
    Home of the D2 horn buttons

  5. #5
    Join Date
    Jan 2007
    Location
    NYC
    Posts
    30

    Default

    Thanks Joey! I'll keep you posted!
    'Maybe the 'Hokey-Pokey' really is what it's all about.'

  6. #6
    Join Date
    Jan 2007
    Location
    NYC
    Posts
    30

    Default

    Well, I put the car on an upward angle removed the cap to the reservoir, and let the engine heat up with the heater on. The coolant in the reservoir got hotter and eventually expanded to the point where it was being pushed up and out of the opening. So... does that mean that there is no circulation, that the thermostat isn't working, or that that it was installed backward?
    'Maybe the 'Hokey-Pokey' really is what it's all about.'

  7. #7
    Join Date
    Oct 2006
    Location
    Ridgefield CT
    Posts
    309

    Default

    Is the book icon diplayed in the HVAC unit? With the engine fully warmed up feel the heater hoses, are both of them hot?

    Where are you in CT?


    Kevin
    Kevin

    04 XJ8
    92 RRC
    02 Benz E320

    95 RRC (sold 5/10)
    72 Series 3 (sold 4/10)
    70 Series 2A (sold 6/10)
    Morgan +8 (sold 8/09)
    90 Jetta (308k miles) (sold 5/11)
    72 Triumph Stag (sold 1/08

  8. #8
    Join Date
    Feb 2009
    Location
    Cincinnati
    Posts
    130

    Default

    You have an air pocket in the coolant system this may cause this issue. Please read this again.... I did state to check fluid level add as needed, then put the cap back on... start engine and let get to temp with heater on... After it warms up shut it down.. let it cool down open fill as needed, repeat until it doesn't need filled again.
    Joey
    97 Disco
    10 MCCSm
    Custom Rover Accessories
    Home of the D2 horn buttons

  9. #9
    Join Date
    Jan 2007
    Location
    NYC
    Posts
    30

    Default

    Quote Originally Posted by kevin-ct View Post
    Is the book icon diplayed in the HVAC unit? With the engine fully warmed up feel the heater hoses, are both of them hot?

    Where are you in CT?


    Kevin
    Hi Kevin,

    I'm in Middletown, CT. The book symbol has been on the heater's display since I purchased the car, over 3 years ago, and the heater worked fine, (as does the AC) Both heater hoses are pressurized and hot after the car has run and warmed up. The level of the coolant in the reservoir when hot is actually a bit above the 'cold' level, and there doesn't appear to be any leakage anywhere, inside or out. What do you suspect? Could there actually be an air bubble or pocket inside of the heater core itself, preventing circulation? For some reason, i don't think it's anything huge, just something simple. But this is not my area of even basic knowledge.

    Den
    'Maybe the 'Hokey-Pokey' really is what it's all about.'

  10. #10
    Join Date
    Oct 2006
    Location
    Ridgefield CT
    Posts
    309

    Default

    Quote Originally Posted by Donagh View Post
    Hi Kevin,

    I'm in Middletown, CT. The book symbol has been on the heater's display since I purchased the car, over 3 years ago, and the heater worked fine, (as does the AC) Both heater hoses are pressurized and hot after the car has run and warmed up. The level of the coolant in the reservoir when hot is actually a bit above the 'cold' level, and there doesn't appear to be any leakage anywhere, inside or out. What do you suspect? Could there actually be an air bubble or pocket inside of the heater core itself, preventing circulation? For some reason, i don't think it's anything huge, just something simple. But this is not my area of even basic knowledge.

    Den
    Den, I am in Ridgefield CT not to far from you. Yes, you may have an air pocket in the system. However, after driving it as long as you have it should have escaped by know.

    I think that one of the blend door motors that controls the temperature is not working.

    I just have replaced all the blend doors motors on a customer
    P38. Have you ever had the codes read for the HVAC system?


    Let me know if I can help.

    Cheers,
    Kevin
    Kevin

    04 XJ8
    92 RRC
    02 Benz E320

    95 RRC (sold 5/10)
    72 Series 3 (sold 4/10)
    70 Series 2A (sold 6/10)
    Morgan +8 (sold 8/09)
    90 Jetta (308k miles) (sold 5/11)
    72 Triumph Stag (sold 1/08

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