98 XJ8 No heat at Idle
#1
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Any ideas on why the the car won't blow hot air at idle. Once I get going it starts to heat. However, once back at idle - no heat. Kind of a bummer since its been cold lately.
My 98 Vanden Plas heat is awesome. its like night and day between the two. However, the XJ8 is my daily driver and better overall.
Appreciate any thoughts.
My 98 Vanden Plas heat is awesome. its like night and day between the two. However, the XJ8 is my daily driver and better overall.
Appreciate any thoughts.
#2
![Default](/forum/images/icons/icon1.gif)
Any ideas on why the the car won't blow hot air at idle. Once I get going it starts to heat. However, once back at idle - no heat. Kind of a bummer since its been cold lately.
My 98 Vanden Plas heat is awesome. its like night and day between the two. However, the XJ8 is my daily driver and better overall.
Appreciate any thoughts.
My 98 Vanden Plas heat is awesome. its like night and day between the two. However, the XJ8 is my daily driver and better overall.
Appreciate any thoughts.
This will not operate until a certain coolant temp. is reached and then circulates the coolant through the heating matrix inside the car.
There is also an electronic valve system sited just below the pump.
These two control the fluid flow.
Seems strange that you start to get heat when on the move but not at idle, which tends to rule out faulty thermostat.
Do you know when was the last time the cooling system was serviced?
Have you gone through the full functions of the heating system including while on A/C?
#3
![Default](/forum/images/icons/icon1.gif)
Any ideas on why the the car won't blow hot air at idle. Once I get going it starts to heat. However, once back at idle - no heat. Kind of a bummer since its been cold lately.
My 98 Vanden Plas heat is awesome. its like night and day between the two. However, the XJ8 is my daily driver and better overall.
Appreciate any thoughts.
My 98 Vanden Plas heat is awesome. its like night and day between the two. However, the XJ8 is my daily driver and better overall.
Appreciate any thoughts.
If the pump is working, if may be the heater valve, but is more likely one or both of the one-way valves.
Of course, make sure that the cooling system is full before doing anything else.
Good luck.
Bill
#4
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Thanks!
Coolant is good and was replaced when the engine was removed 500 miles ago. I also just replaced the reservoir which was leaking where the sensor plugs in. Also, the A/C was inop, but had the temp sensor replaced and everything's working fine with that. I also replaced the right blower which had seen it's last days. Other than that, nothing else done with the heat or A/C.
Is this the Part your referring too? I don't know if this is considered the valve or the pump. Doesn't look too hard to get to. I was thinking if that's it, I could swap it out with the parts car I bought. Then as mentioned, fix the other one if the brushes are bad.
The manual didn't seem to have much on this guy. At least what i could find.
Coolant is good and was replaced when the engine was removed 500 miles ago. I also just replaced the reservoir which was leaking where the sensor plugs in. Also, the A/C was inop, but had the temp sensor replaced and everything's working fine with that. I also replaced the right blower which had seen it's last days. Other than that, nothing else done with the heat or A/C.
Is this the Part your referring too? I don't know if this is considered the valve or the pump. Doesn't look too hard to get to. I was thinking if that's it, I could swap it out with the parts car I bought. Then as mentioned, fix the other one if the brushes are bad.
The manual didn't seem to have much on this guy. At least what i could find.
![98 XJ8 No heat at Idle-%24t2ec16j-yse9sy0hce-bry-g-cs4g%7E%7E60_3.jpg](https://www.jaguarforums.com/forum/attachments/xj-xj8-xjr-x308-27/66505d1480970705t-98-xj8-no-heat-idle-%24t2ec16j-yse9sy0hce-bry-g-cs4g%7E%7E60_3.jpg)
#5
![Default](/forum/images/icons/icon1.gif)
Thanks!
Coolant is good and was replaced when the engine was removed 500 miles ago. I also just replaced the reservoir which was leaking where the sensor plugs in. Also, the A/C was inop, but had the temp sensor replaced and everything's working fine with that. I also replaced the right blower which had seen it's last days. Other than that, nothing else done with the heat or A/C.
Is this the Part your referring too? I don't know if this is considered the valve or the pump. Doesn't look too hard to get to. I was thinking if that's it, I could swap it out with the parts car I bought. Then as mentioned, fix the other one if the brushes are bad.
The manual didn't seem to have much on this guy. At least what i could find.
Attachment 66505
Coolant is good and was replaced when the engine was removed 500 miles ago. I also just replaced the reservoir which was leaking where the sensor plugs in. Also, the A/C was inop, but had the temp sensor replaced and everything's working fine with that. I also replaced the right blower which had seen it's last days. Other than that, nothing else done with the heat or A/C.
Is this the Part your referring too? I don't know if this is considered the valve or the pump. Doesn't look too hard to get to. I was thinking if that's it, I could swap it out with the parts car I bought. Then as mentioned, fix the other one if the brushes are bad.
The manual didn't seem to have much on this guy. At least what i could find.
Attachment 66505
#6
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#9
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Before we close this thread, can I ask a somewhat related heat question? Why does my heat cut out when I am clicking along at 50 or 60 mph in cold weather? Water pump and thermo are new in the last year or two. A/C steadily blows cold in the summer. Usually I shut if off, wait a few mins, and restart and heat will resume.
Ideas?
Ideas?
#10
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When I replaced the brushes on my heater pump, I used these brushes.
They had to be filed down to fit, but not too much.
Good luck
Bill
They had to be filed down to fit, but not too much.
Good luck
Bill
#11
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When I replaced the brushes on my heater pump, I used these brushes.
They had to be filed down to fit, but not too much.
Repair Parts 17/32" x 7/32" x 6/32" DC Electric Motor Carbon Brush 10 Pcs - Amazon.com
Good luck
Bill
They had to be filed down to fit, but not too much.
Repair Parts 17/32" x 7/32" x 6/32" DC Electric Motor Carbon Brush 10 Pcs - Amazon.com
Good luck
Bill
Did you cut and resolder the wires or did you add connectors for easy replacement next time? I was thinking connectors would be good.
Dan
#12
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