1999 Jaguar XJ8 NO HEAT AT IDLE IN XJ8

CQUALITY

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1999 JAGUAR XJ8
V8
2WD
AUTOMATIC
65,000 MILES

DEAR SIRS
I HAVE A 99 XJ8 THAT RUNS PERFECT EXCEPT FOR SOME REASON NO HEAT AT IDLE OR WHEN STOPPED AT LIGHT. HIGHWAY SPEEDS HAVE HEAT? FLUSHED SYSTEM AND SAME PROBLEM. TEMP GAUGE IS IN MIDDLE AND FANS WORK. AIR CONDITIONER WORKS PERFECT. ALL BLENDER DOORS ETC. FUNCTION. ALL HOSES RADIATOR AND HEATER CORE ARE WARM. NO LEAKS ANYWHERE. COOLANT LEVEL IS FULL

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JAMES W.

MECHANIC
2,394 POSTS

Is your coolant system low?

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Thursday, November 13th, 2008 AT 1:01 PM

CQUALITY

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AS STATED, FLUSHED SYSTEM AND STILL THE SAME.
THIS INDICATES THAT FLUIDS REPLACED AND FILLED.
THANKS

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Thursday, November 13th, 2008 AT 1:08 PM

JAMES W.

MECHANIC
2,394 POSTS

Your heat system has a pump that circulates water through your heater. WHY, you may ask. When you are cruising down the road at highway speeds, the engine water pump is turning fast enough to circulate the coolant through the heater. At low speeds, or at stop signs, the engine water pump isn't turning fast enough to accomplish this. So Jaguar, in their infinate wisdom, installed an electric pump to compensate for this. This pump is obiously not working. I is located under the bonnet on the driver's side, close to the firewall. I would first check for a blown fuse, if all "OK", then sheck out the pump motor and related circuits. Hope this helps.
I didn't mean to "knock" Jaguar, I have 2 XJ6s and spend a lot of time keeping them on the road.

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Friday, November 14th, 2008 AT 8:31 PM