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Jaguar XJ-Series Heating/Cooling Issues

12 messages,  Last post on Jan 25, 2009 at 5:29 AM

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What is this discussion about? Jaguar XJ-Series, Heating / Cooling, Sedan

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#1 of 12 XJ8 Vandenplas Heat stopped working by jumangia Oct 26, 2008 (9:09 am)
Hello everyone. I have been reading the boards to find out if someone has had any issues with Heat not working in XJ8. I own a 2001 XJ8 Vandenplas and the heat stopped working. I started to check items that I know would more then likely cause the issue. I checked the hoses coming in to the Heater core and the exit hose. I had heat one the incoming but not on the out going. I figured the Heater valve to be bad so I replaced it. Still the same issue(even though I tested the valve before installing it). I have the CD that came with the car (No Maintenance book) that says there is also a Motor ? that sends the water through the heater core. I have tested the voltage that comes from the climate conrtrol system to make sure it was sending the correct voltage for the valve to open and close. I guess the question would be: Could the Motor for the heater be blocking the path? The AC works perfect. Has new water pump and thermostat. The Temp sets in the middle range of the gauge. Temp sensor is new as it came with the plastic piping. (Hoping its not the climate controll inside the car) Replies to this message: jade4 (Oct 29, 2008 1:27 pm) joeyxjr (Jan 25, 2009 5:29 am)
#2 of 12 Re: XJ8 Vandenplas Heat stopped working [jumangia] by jade4 Oct 29, 2008 (1:27 pm)
Replying to: jumangia (Oct 26, 2008 9:09 am) hi i have the same problem, can you tell me were the heater valve is ? i can't seem to find it . thanks for any help. Replies to this message: joeyxjr (Jan 25, 2009 5:29 am)
#3 of 12 by jumangia Oct 29, 2008 (4:01 pm)
yes, rear of hood compartment. Left side right under the filler(where you add the antifreeze). You have to remove the plastic covers to get access to the Heater Valve. Oh I replaced that heater valve and that didn't fix the heating problem. I dug further to find the Auxillary Heater motor was not spinning, it is located just in front of the Heater Valve. I am crossing my fingers that the one I ordered will fix the problem. Will let you know if it does.
#4 of 12 by jumangia Nov 01, 2008 (3:31 pm)
Well that didn't fix the Heat either. Seems there is something else that is causing it to not function. After taking both items out and bench testing them, and of course they both work. The auxillary pump relay is only getting +12volts when the pump is connected. With it disconnected there is no Voltage to the relay. Which is wierd in my book. from my understanding the relay should have 12 volts constant on one terminal. If there is anyone out there that has some insite on this one please feel free to post what else needs to be tested or replaced. Replies to this message: jade4 (Nov 14, 2008 2:48 pm)
#5 of 12 Re: [jumangia] by jade4 Nov 14, 2008 (2:48 pm)
Replying to: jumangia (Nov 01, 2008 3:31 pm) check fuse behind right heel plate
#6 of 12 by jumangia Nov 14, 2008 (5:18 pm)
Ok, after checking the signals sent from the Controller to the Climate control (computer) tested good. Ohm's checked the Wiring from the Aux Motor and Heater Controll valve. Those tested good. The ground signal from the CCM to the relay was not coming out. Bad CCM. Replaced the CCM (Used of course). Motor and Heat valve are working. Shotgun is loaded for the rest of the story=). I am only getting some heat out of the Left front Vent only. Not getting any heat out of any other vents. Very mild heat. So there is still something not working right. Gonna be a cold weekend trying to find the Problem. Either I have a door not closing all the way or the Water is still not flowing fully through the core. I will check the Fuse behind the Right Heel Panel though just to make sure.. Replies to this message: jade4 (Nov 19, 2008 6:09 pm) jumangia (Nov 20, 2008 4:31 am)
#7 of 12 Re: [jumangia] by jade4 Nov 19, 2008 (6:09 pm)
Replying to: jumangia (Nov 14, 2008 5:18 pm) pump is not working strong enough i had same thing in stall 15 dollar rv pump heat is great will change when back to right pump when find used ome Replies to this message: jumangia (Nov 20, 2008 4:31 am)
#8 of 12 Re: [jade4] by jumangia Nov 20, 2008 (4:31 am)
Replying to: jade4 (Nov 19, 2008 6:09 pm) Heat Fixed!! Ok after replacing the CCM electrical power was restored to the Heat pump motor. But only had heat at left Vent. I figured there was something blocking the coolant. I removed the hose from the motor going into the heater core. I blew air through the hose. At first the air wouldn't blow through it. Finally it did. This is a main problem. make sure that when you get your car serviced anywhere that they do not mix the Anti freeze. It will make a Jel and block the core. I know there are places that sell the Green antifreeze that is supposedly compatible. Don't do it it won't mix. I hope all the stuff I have done will help others with their heat problems. Jade4 I did find a used Pump on the internet for $138.00 Dollars. My old pump still works but the contacts in the motor are worn down along with the contact on the windings. I will see if a local electric motor repair shop can rebuild it. Will let you all know if this is something that can be done to reduce the cost of buying used or new ones. Anyway <<<<< Happy in Tennessee now!!!!
#9 of 12 1994 XJ6 Air Conditioning Problem by OME_OMY Dec 11, 2008 (12:06 pm)
Tried freon only with local general shops, slow leak. but looks like i am headed for major air conditioning work in the spring. Anyone out here have the problem of the air conditioning working, but not ever cooling very well. Max button doesn't do anything. This A/C has been weak since buying it several years ago. Freon loss isn't the problem. I hate the prospect of new compressor, dryer, etc.   And what drives me crazy, is that when i turn the switch on, the A/C comes on when it wants to, about half the time. And when it is hot here in Louisiana, we NEED A/C. Seems like an intermittent switch. Here we go again with electrical problems.
#10 of 12 Looking for a great Jaguar mechanic/tech by OME_OMY Dec 11, 2008 (12:23 pm)
My search is focused on looking for a good or great Jaguar mechanic/tech. Particularly electrical/computer problems and enhancements. My experience with the Mobile Alabama Jaguar dealership and others is that...The techs that are great for newer models are not old enough to be great with my era Jaguars...1994 XJ6   I will travel long distance to any southern states particularly to find such a tech and service facility. Texas, Louisiana, Mississippi, Alabama, Florida, Tennessee, Missouri, Arkansas for example. Do YOU know one?

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