Join Date: Jun 2010
Location: Northern California
Re: 1966 chevelle heater core replacement
Having just done this job this last summer, I can give you some of my thoughts. First, it helps to be a bit of a contortionist, as you have to do some of it from inside the car and some of it from under the hood. By all means, get a new gasket/seal kit for the heater...You won't want to do this job again for a long while and if the heater has never been rebuilt, the gaskets will be dry, brittle and in need of replacement. Also, plan on taking out the glove box door and liner...this will help provide access on the inside part. You will also need to remove the fender well/liner on the passenger side to get access to some of the case bolts. No real magic to it, just a PITA to get to some of screws and bolts. If all this scares ya...pay someone to do it for ya. One more thing, if you want to postpone the job for a while, go to NAPA and get a coupler for the two different size hoses, and bypass the core....no heat...but no leaks in the car either.