hi,can anyone solve my heater problem? 1994 xj40 heater blows hot in footwell but cold at dash level & also at demist, i have checked the upper blend motor but this appears to be working, could the actual blend flap be stuck & how could i remedy this or do you have any other possibilities as to what might be causing this?
Ray

 

I think heater core is clogged up .

 

thanks for your reply cadillac, i have tried back flushing thr heater core maybe there is still a blockage i removed hoses from bulk head & attached a hose, is there anything else i can do before i buy another 1 ?

 

I'm not well versed on the Jaguar heating system, (totally ignorant as a matter of fact), but it seems to me that if the heater core was clogged you wouldn't be getting heat anywhere.

From your description, I would go with your initial diagnosis - that it is a routing problem or blockage rather than a complete lack of heat.

 

Ya know there is a lower mode door motor in that system as well. It sits behind the a/c processor, the "piano". You might give both of the mode motors a couple of taps, they might free up and work a while.

Good luck,

 

I actually had this problem a few weeks ago and it turned out that the left demist flap broke and fell into the upper rotary flap. The flap would turn a little back and forth but not enough to allow heat to get to the upper part of the system.

I pulled the center vent, instpack and passenger veneer panel to get to the center vent vacuum flap fasteners and removed it for access to the broken demister flap. I pulled the broken part out and the rotary flap operated thoughout the proper range.

bob gauff

 

thanks bob, this could very well be whats wrong with mine, as soon as i get chance i will look into it & let you know.

Ray

 

Bob Gauff your the man !!! you were bang on the money, i took the dash a part & found both demist flaps had broke & 1 had jammed in the rotary flap, i removed it & hey presto i have heat blowing out of the top vents, not sure what
problems i might encounter without demist flaps but who cares i have heat !!!
thanks a million.
best regards Ray

 

Good to hear.
I just post what happens to me and sometimes it happens to others. I have the luxury of working on the same cars over and over, so I see some similar faults over the years.

Thanks and good luck.

bob gauff

 

Kudos to you on the positive post on motorcarman , it always pays everyone to see their hints are proven correct , have many happy driving

 

this was the same issue i had with the flap. thanks for the help on that.

 

glad you got it sorted i know what it's like to have cold car !