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where is the heater relay located

02-14-2011, 10:42 PM
hi i just bought a 1990 Buick LE Sabre custom with 81,000 miles i was told the heater didn't work do to a faulty heater relay. i got home and i turned on the heater and it blows. i tried to switch from defrost to other positions but nothing happens is this a issue with the relay or is it the blend door? please help. also where is the heater relay located? thanks for your help

Blue Bowtie
02-19-2011, 10:32 AM
A 1990 model would still use a vacuum actuator for the defrost/heat damper. Verify that the vacuum source from the intake is connected. There should be a line routed through the firewall to the HVAC controls. These often deteriorate or are inadvertently disconnected.

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