Some folks here may recall the various threads I have started here regarding my struggles with the climate control system on my MY94 XJ6.
In the last thread I had reported that changing the DBC10009 relay I had good reliable climate control operation.
However even though I have reliable climate control of the fans in the car, I still have no detectable heat flowing into the car.
I have checked over the past week or two the inlet and outlet hoses for the heater core.
I thought I could detect by feeling the hoses that the inlet hose was much warmer than the outlet hose leading me to believe that the heater core could be clogged up.
So yesterday I partially drained the cooling system and after much struggling I was able to remove the inlet and outlet hoses from the core connections on the firewall.
I then used a hose from my house water supply to inject water under pressure into the outlet of the heater core.
When I did this I had a kink in the garden hose I was using to do this with and when I leaned over to straighten out the kink I missed the actual first flow results through the heater core.
However I did hear a sort of “plop” and then when I turned to look at the water flow through the heater core in the reverse direction, it looked really good with a strong flow of water passing through the heater core and flowing out of the normal inlet connection on the heater core.
So thinking I had a positive result here, I put the hoses back on the heater core connections, filled up the cooling system again, and pilled the dog into the car so we could go for a ride to enjoy the fine heating system in the car.
Unfortunately after driving around for some time with the heater controls set for heat and the fans on medium I STILL HAD NO HEAT! ARGH!
What I do have is a constant flow of strong COLD air flow up at the windshield even though I do NOT have the system set on defrost and this air flow blowing out of the windshield vents is definitely not warm at all even after driving around for a half hour or more.
Anyone have any ideas what I should be looking at next? I noticed the revival of the Jaguar PDU thread and got to wondering if there was any diagnostics in the car for the climate control system.
My suspicions are that I somehow do not have the various doors in the climate control system operating as they should when I set the controls for heat.
Any and all suggestions would be most welcome at this point.