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  1. #1
    Senior Member
    Join Date
    Jun 2011
    Location
    Hawick Scottish Borders
    Posts
    112

    Heater not working

    2002 XK8, heater not working. All I can get is cold air blowing into car. Engine temp normal on gauge. Water pipes to and from radiator both hot.
    However 2 heater hoses going to bulkhead one hot and one cold! Any suggestions gratefully received.

  2. #2
    Senior Member astromorg's Avatar
    Join Date
    Apr 2011
    Location
    Portsmouth/Southampton
    Posts
    1,439
    At the risk of being the bearer of sad tidings, it sounds like the heater pump or valve. Could possibly be Fuse 15, 10A in the Engine Compartment Fuse box, or F3, 5A but that protects a few other things that you might have also noticed. It could also be the relay in the same fuse box - its the rearmost one of the three in a fore and aft line.

    If none of them it could be the pump itself that's really awkward to get at on top of the transmission, by the main bulkhead. There's a useful guide here by RaceDiagnostics

    Heater pump repair.
    2005 XK8 4.2-S Coupe and 2005 Auto SE 2.5 X Type Saloon

  3. #3
    Senior Member
    Join Date
    Jun 2011
    Location
    Hawick Scottish Borders
    Posts
    112
    Excellent info thanks - looks good fun! will check out in next couple of weeks and let you know. think I will look out another jacket in the meantime
    cheers

  4. #4
    Member Peter George's Avatar
    Join Date
    Jun 2013
    Location
    Norfolk UK
    Posts
    97
    I have been here before. As guided by Mr AstroMrog: Fuse #3 - 5amp. Mine was the passive/active sounder horn. Who would have thought a faulty security horn would stop the heater from working?
    I still haven't replaced that horn yet. Just pulled the plug.


 

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