1988 GMC C1500 Heater Control Valve Location: Heater 1988 GMC C1500 V8 Two Wheel Drive Automatic. After checking in the Haines manual and asking every autoparts store customer service this part seems to be hidden. Does anybody know the exact location of this part? I have checked the lines going in to heater core and near firewall, also have pulled off the dash and checked behind the glove box. 1988 chevy truck heater control | eBay Save 1988 chevy truck heater control to get e-mail alerts and updates on your eBay Feed. + 1988-1994 GMC-CHEVY-TRUCK-AC-HEATER Control Wiring Harness Pigtail 16204785. Pre-Owned. $30. or Best Offer 1988 - 1994 Chevy C/K 1500 2500 Pickup Silverado Heater Control 16177075. Pre-Owned. $67.
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