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Thread: Cabin heater not heating

  1. #1

    Cabin heater not heating

    i have a 2006 Accord diesel that has had a cabin heater issue i cant figure out.

    A water pipe came loose from the expansion tank a few months back and it ran low on coolant. I caught it before it overheated and all was well. That coincided with the blower fan packing up and by the time i got it replaced i realised the heater wasn't doing much at all.

    So assuming it was an air lock i bled it, and bled it, then I bled it again over a couple of weeks. Very little air made its way out. Even after driving for an hour it's barely lukewarm coming out through the vents.

    The temperature gauge is behaving normally... I can see the valve operating at the bulkhead inlet when i adjust the temperature...im not losing any coolant....haven't noticed any damp inside or smell of coolant.... It's foxing me. Any ideas? Partially blocked core?

  2. #2
    Could be a blocked or partially blocked heater matrix or heater tap. Did you pressure bleed it or just run it with the cap off and opening the bleed screw(s)?

  3. #3
    Quote Originally Posted by Speedy View Post
    Could be a blocked or partially blocked heater matrix or heater tap. Did you pressure bleed it or just run it with the cap off and opening the bleed screw(s)?
    With the rad cap off for an hour, pointing up an incline opening the bleed screw every few minutes. Would pressure bleeding be a better option?

  4. #4
    I'd find it hard to believe after all this time it hasn't self bled...put your hand on the two pipes going into the bulkhead? If one is hot and one cold it most likely is the valve that opens to allow the hot air into the rad.

    Was it possible fitting the motor you could have knocked something. In the older cars there was a system of cables to turn from hot to cold but on more modern stuff it's done by a little electric actuator. Have a root and see what you find.

  5. #5
    I spent ages looking for why an MR2 i had wasn't heating the heater matrix... I bleed it with in a inch of its life.... Turned out the control arm to allow hot coolant flow into the matrix wasn't opening fully.... Adjusted and sorted.... worth a look....

  6. #6
    Another angle, might not be relevant. Is this a climate control system and any chance the cabin temperature is being misreported? Don't know whether that could be picked up on the fancier OBD scanners (Honda specific)

  7. #7
    Heater resistor, was common enough on the DC5's and probably the same part...
    https://www.lingshondaparts.com/part...ckref/B__1721/

    No. 11 in the diagram.
    I'm standing in a field full of sheep, is it wrong that I feel aroused

  8. #8
    Quote Originally Posted by Bazg2 View Post
    Heater resistor...
    I don't think so, the resistor pack controls the heater fan speed.
    ________
    Wheelnut

  9. #9
    I'm having a similar issue with the 5 series. Heater works alright but not brilliantly. Now I'm a cold fish anyway and I like my heat but it's really only lukewarm air it's blowing. - Is there anyone that specialises in such things that would know what to look for?

  10. #10
    Quote Originally Posted by bloke View Post
    I'm having a similar issue with the 5 series. Heater works alright but not brilliantly. Now I'm a cold fish anyway and I like my heat but it's really only lukewarm air it's blowing. - Is there anyone that specialises in such things that would know what to look for?
    What 5 series is it, on e60's you can set the temperature of the air coming out of the centre vents separately to the cabin temp through the i-drive

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