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check and see if the thermostat been removed
check to see if the heater core has been bypassed. if the heater core was leaking at some time in the past, the previous owner may have bypassed it (with a 2 dollar hose bypass kit) instead of actually fixing the leak. this was the case on my 1990 xj6.

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โˆ™ 2007-07-02 01:30:42
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Q: No heat on a 86 xjs v12 but blower and ac work fine and there is no mention of any heat related fuses etc in manual help?
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