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I have a 2000 jaguar S-Type. My heater hasnt worked for 2 yrs. my A/C worked last yr but is not working this year. What could be wrong w/it?

The pipes going to the heater core heat up when i try to use the heat. But the heat still wont work. When i try to use the A/C it only blows out warm air. I dont know what to do. Any suggestions?

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There is a gas(freon) leakage and the ac circuit lost all or large quantity of the ac compressor does not start .You have to find where the leakage comes from and repair it accordingly and then refill ac system with freon liquid. Have in mind that this kind of liquid can easily leak from a cracked hose and which crack is like a single hair.

Posted on May 15, 2014

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Unfortunately it's a big problem with all jags for over 25 years. same thing every time. Inside the heater unit there is a complex system of pipes and diverter flaps that direct the air flow through the matrix and a/c exchanger. It's a mess. they fail or get jammed (or both) sometimes a fuse can be changed (but it probably blew because of a jam) It's over complicated. Sorry I can't wave a wand here, but I've owned 7 Jags, between 87-98, same with all of them.
Can you afford a Jag service centre ? (I love jags but this kind of problem wore me out) But just check if you a/c needs charging and your coolant is topped up. It sounds like Heater diverter valve has jammed though. All electronic !

Posted on May 15, 2014

  • gmduvall May 22, 2014

    As an instant check, look towards the "Heater Valve" they become corroded, often due to incorrect coolant mixture. It starts to draw more amps as it fails, this in turn will eventually cause the climate control module to fail. Vibration and leakage are the main cause of this problem, then it spreads, control flaps etc....It's a common problem as I said in my previous note. At least you have a start point. good luck Red


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