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heater wont work?


Registered Member
Mar 24, 2004
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grand rapids, Michigan
1972 GMC Jimmy, had factory air, but I hacked up the plenum on the firewall the way a friend told me I needed to do, but no heat. Starting on far left where blower motor is, i kept the hole covered that is just to the right of the blower and sealed off the other hole towards the center of the engine compartment. I have a new heater core in it, but it wont generate any heat, any suggestions what to try next? Thanx in advance.
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