hello everyone this is my first time so please ignore my ignorance

the heater has stopped working on my 2003 xkr and rear de mister after having some recent work service etc recently. The heater and heated rear window will start to work after longer motorway journeys of around 20 mins and then will stop after the engine has cooled down again!! any thoughts please

 

Too many thoughts. The first is that the heater pump is not working properly, or maybe the valve is not opening all the way. Or it could be the heater core is plugged. If you use the search function you will find many threads on the subject.
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Check the 5 amp heater pump fuse. It's located in fuse block above the ABS pump on drivers side. Also check the relay, same location.

 

Probably the heater pump.

 

thanks everyone for your time and advise, will look at fuses next day or so

 

electrics seem to be fine, it seems that the heat and rear heated screen only work if the car has been driving for around 20 -30 mins. Its as if it takes that long for the heater to warm up?? any other ideas.
regards

 

electrics seem to be fine, it seems that the heat and rear heated screen only work if the car has been driving for around 20 -30 mins. Its as if it takes that long for the heater to warm up?? any other ideas.
regards

 

Well, I can tell you that it takes quite a bit longer for hot air to come out of the vents in my Jag than in any other car that I have owned and I have to turn it all the way up to about 80 degrees to get it to come out hot at first. It is not my daily driver and I live in Louisiana where it does not get very cold very often so it is not a big bother for me, but if I lived in a cold climate and had to drive it every day, it would be annoying.

 

It's almost certainly the heater pump. Can't help with rear screen though maybe it just switches off after a while?

 

Here is a test for the heater pump, once you have been driving round for a while and the heater is working, pull over but keep the engine running. Now feel the temp of the hot air with a thermometer or just your hand, if it starts to drop down to the ambient outside temp after a couple of minutes, then its probably your heater pump.

Three options,

Live with it, I did for a 18 months.

Fix it yourself, probably about 8 to 10 hours of work (the first time) and a few special tools needed.

Get the garage to fix, you will be looking at 6 hours of labour plus parts, now that will be expensive at my local Jag garage which charges £170 an hour.