Re: Heater issues on 68 RS w/fac A/C
Change out the heater core:
1. Drain coolant, pull off heater hoses at core nipples and drain into a clean pan.
2. Remove the seven nuts from the engine side, these hold the inside box against the firewall.
3. open door and lay down on carpet/floor, a continuous sheet of plastic from the top of the toeboard (bottom of the heater box) to under the pass seat and from the top of the driveshaft tunnel out and over the rocker panel. This sheet will collect the leftover coolant for collection and easy clean-up.
4. Remove glovebox door and glovebox - gives you a better view of the job so you don't have to lay on the floor and look up.
5. Grab the top and bottom of the neck on the left side, just about at the junction of the pass floorboard and trans tunnel and pull the heater box breaking loose the seal, then pull the far pass side of the box and as pulling out the box, guide the box to help the core nipples through the hole in the firewall.
6. Once box is loose, lay box on plastic with core straight up.
7. Use a 5/16 socket and remove the clamp, then pull out the core.
The cables are just long enough you don't have disconnect them.
One of two choices, take old core to store and match up the best you can with new core, You might have to use alum spacers making up for the thickness for the clip to do its job in holding the core in place, or, take the old core to a rad shop and ask if they can clean and fix core - better idea.
Replacement is the reverse, but you have to be aware of the nipples through the firewall. Any hard push and nipple joint-to-tank cracks and leak has been born.
Once box is back into place and before going to engine side, ensure all the cables work and their function, read doors, work.
Don't let your pets drink the antifreeze.
Fill with coolant and check for leaks and operation.
Enjoy a cold adult beverage when done, maybe.
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