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I am having the same problem w/ my '89 Vic. The entire housing for the heater core (plenum?) is easily moved and wiggled. The snag appears to be some where around the bolt that tightens the casing to the fire wall; which is located on engine side adjacent to the inlet and outlet hoses for the core. I took off all possible nuts and bolts engine side, and every screw under the dash. I got a copy of the schematics of the plenum and there appears to be parhaps a bracket on top of the plenum, but I could not find it. The Haynes manual apparently doesn't have anything different than the istructions I obtained from a local dealership. This is very frustrating since labor is running around $400-500 and the core costs only $25. I really don't want to break anything (nor do I want anyone else) since I bought the car in mint condition. PLEASE help me.
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