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XJ6 & XJ12 Series I, II & III 1968-1992

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Old 11-15-2012, 10:05 AM
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Default 89 XJ12 Series 3 - Heat Issues

Vehicle is stuck in cold mode. Compressor stays on and cant get heat. I have already tried replacing the compressor, the servos are all good, all wiring and hose in right place. I have been at this for three days trying to figure it out with a similar car with working heat side by side as a reference.

Please any advice would be appreciated.
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Old 11-15-2012, 10:38 AM
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Does the heater valve open to allow hot coolant into the heater core?

When selecting full heat on the temp control knob does the system respond by sending air to the footwell vents? If so, the system at least understands and is trying to comply with the request for hot air....which is a good start

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DD
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1995 XJR
1988 Ser III VDP V12
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Old 11-15-2012, 10:39 AM
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By the way it's normal for the compressor to stay engaged. All air is cooled first and then heated as needed

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DD
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Old 11-15-2012, 07:58 PM
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Default try this...

Does the servo motor change positions when you move the temp setting? If not then check that the resistance varies across the blue and white wires on the temperature dial(variable resister). Then check the reistance on the cabin air temp sensor which is in the dash. Then then resistance on ambient sensor which is on the side of one of the blower motors. If all three sensors check out then your amplifier is probably bad.
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Old 11-15-2012, 08:28 PM
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Icsamerica, your suggestions apply to the Delanair MkII system. Since this is an '89 Ser III it'll have the later Delanair MkIII system which is a different animal.

Not trying to bust your chops. I just don't want anyone looking for things that won't be there :-)


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DD
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Old 11-15-2012, 08:28 PM
 
 
 
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