[64Joker]

Getting ready to replace heater core, blower motor, resistor, switch, etc. on my 64 Impala SS, it appears the heater "mount" bolts go through the firewall and need to be removed from within the engine compartment firewall side, is this correct? Any other tips or cautions I should take into consideration? How do you get to those 2 nuts that run near the fender wells/fender? Thanks in advance!!!

[grandpaws 57]

yes the nuts come loose from engine side.You may have to drop inner fender panel.Or, you can use a hole saw and drill an opening.Save cut out and tack with welder.Or,you can drill out stud from pass. side.Sometimes the nuts are real hard to get off. Have fun!

[75gmck25]

I don't know how hard it is to remove the inner fender on the Impala, but on my '75 GMC truck it was relatively easy. I might have gotten the last nut on the heater box off without taking the inner fender off the truck, but it was nearly impossible to reach from the engine compartment.

I also found that it was hard to push the heater box into place and hold it there while we put the nuts on from the engine compartment side. The firewall insulation gets in the way, and its hard to keep enough horizontal pressure on the box to hold it in place until you get the nuts on the bolts.

Bruce

[64Joker]

I was able to remove the heater with all your additional suggestions, thanks!
I had to drop the inner fender cover, which was relatively easy, in order to remove the last two nuts. Now for the install..... Thanks again guys & gals ..

[64Joker]

As stated previously, I was able to remove the interior heater box after dropping the inner fender, now I'm attempting to remove the exterior heater box (under-hood) that contains the heater blower motor.
I removed all the visible bolts, but I can not get to box loose from the corner where the fender meets the hood, does anyone know if there is one last bold in that corner, if so, do I need to remove the fender in order to get to it? Hope not!

[grandpaws 57]

can't remember about bolt,but we didn't remove outer case.There may be a self tapping screw from engine side.Was that a/c car ?

[64Joker]

There is no AC, perhaps a shop manual will display if an bold lies at the corner of the configuration.