Diesel xj, no heating

[Ric Roth]

Hello guys, the problem is: no heat in my 99 xj 2.5 td

Did a coolant flush, cleaned and flushed the heater core (that was clogged). Engine temp is perfect (85°C), no overheating. Hoses to/from the heater core get as hot as the rad hoses. heater power/position switches work as they should. Heater resistor replaced a couple of years ago.

What to check now?
How do I test if the temp switch work as it should? Is there a visual way to check if the flapper opens as it should?

The funny thing is that the heat was just fine before replacing the coolant (that was basically mud...)

[vernicious]

Blender door?

[layback40]

Originally Posted by vernicious

Blender door?

Agree 100%
I believe it is operated electrically.
The OP needs to check all fuses & see if that is the problem.
Probably a good idea to download the on line manual & understand how the air flow works for the heater.
My limited experience is that mine stopped working in the hot position last year & I was getting hot air. Checked the fuses in the compartment inside the car in the kick panel, found a blown fuse & the problem fixed.
Once the OP has checked this, the next step would be to check its operation. Again, the downloadable manual should have information.

[Ric Roth]

sorry guys for the late reply, thanks for the info.
Idk how and why, but today the heating is working as it should, and never been so warm before!
I think it may be some electrical-related problem, to the knob or whatever.
Btw, merry christmas