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Heat problem 1992 grand marquis my heat only gets luke warm. both hoses going into fir wall are hot. when I push heater control lever to the left off position heat goes off. is there a relay or sensor for this problem

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If memory serves me these cars use a vacuum operated heater control switch follow the heater hoses back to the fire wall the switch should be located somewhere in line with one of the hoses have someone activate the heat temp control and check to make sure the switch is getting 18 lbs of vacuum. Vacuum gauges are fairly inexpensive purchase one to check. If there is less than 18 lb at full temp. setting on controls the check valve must be replace and the hoses source connection must be checked make sure it is not broken or dry rotted. Hopefully the electronic controls on the dash are not malfunctioning.

Posted on Oct 05, 2009

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