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It'll take about two hours to R&R the heater core. It comes out from the top of the heater box. Remove the wiper arm, lower windshield trim, screen on top of the heater box, blower motor, lower windshield trim brackets, etc... There are lots of screws holding the top of the box on, including 2-3 inside the box. Make sure you get all of them before you start trying to remove the top. When you think you have them all out, look again for more. Getting the top off is a bit tricky because it will get hung up on the metal standoffs for the brackets for the lower windshield trim. Once the top is off it's clear sailing. There is a ground wire attached to the heater core bracket that needs to be removed also.
While the top is off clean out the cracked weatherstripping on the top of the box at the firewall, and apply a liberal amount of new sealant. This will prevent future leaks into the passenger floor area. I use regular RTV sealant in a tube. You'll also need a new seal for the top of the box. Clean out all of the old seal, some will be on the top and some will be on the box. I use a calking rope that I buy at Home Depot. It comes on a roll. It's in the weatherstripping department. It's about 5/16" in diameter and fits perfectly in the grove for the top seal.
While the top of the box is off, look down into the bottom of the box underneath where the blower motor would be. There is a rubber flap that allows trapped water to drain out of the bottom of the box. Take the opportunity to clean it out as it usually clogs up with debris after a while.
I've done more of these than I can remember. Good luck.
Necoa #: 7599
Location: 15(AZ,NM)
Joined: Jun 06, 2006
Posts: 121
Year: 1985
Model: El Camino
Posted: Mon Jul 17, 2006 8:32 pm Post subject:
Ernie is dead on. I did the same procedure and was surprised at how easy it was. The only thing I wanted to add to Ernie's instructions is that if you still feel uneasy you can cheat !
Well sort of......I can't remember the site but I Googled something like "G body heater core exchange" and there I found the procedure complete with photos. It takes away any uneasiness when you print it out and have a step by step photographic guide. Took me 2 hours and I had not done this before.
I've done a heater core and an evaporator on two different G bodies that I've owned. Pay close attention to sealing this thing back up. Ernie has probably been there too, if you don't get this sealed up good you find a puddle on your floor after the first rain storm.
Mike _________________ "That the automobile has practically reached the limit of its development is suggested by the fact that during the past year no improvements of a radical nature have been introduced." (Scientific American January 2, 1909).
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