Heater core/repair manual

[lawdog49]

2 questions-

How difficult to change heater core in 91 Burb?

Which is the best repair manual to buy- Haynes, Chilton, etc.?

[VileZambonie]

The best manual is the factory service manual. Does it have AC?

[lawdog49]

yep, it does have AC.  bought the truck and they had just t-ed off the lines, apparently the core was leaking/bad.

[Captkaos]

It isn't fun, you practiacally have to remove the AC system to get to it.

[ccz145a]

And those bottom nuts on the air handler are a bugger with the inner fenders in the way

[VileZambonie]

You can do it without dropping the inner fender if you have swivel 1/4" drive sockets.

1988-91 R/V Series WITH AIR CONDITIONING


Disconnect the negative battery cable.
Disconnect the heater hoses at the core tubes and drain the engine coolant. Plug the core tubes to prevent spillage.
Remove the glove compartment and door.
Disconnect the center duct from the defroster outlet duct.
Disconnect the center, lower air distributor and the center air outlet ducts.
Disconnect the temperature door cable.
Remove the nuts from the 3 selector duct studs that project into the engine compartment.
Remove the outlet duct-to-instrument panel screws. Pull the assembly rearward to gain access to the wiring harness and disconnect the wires and vacuum tubes attached to the unit.
Remove the heater distributor from the truck.
Remove the heater core retaining straps and remove the core from the case.
To install:


Install the heater core. Be sure that the core-to-core and case-to-dash panel sealer is intact.
Position the heater distributor. Connect the wires attached to it and then install the heater distributor-to-instrument panel screws.
Install the floor outlet and tighten the defroster duct-to-heater distributor screw.
Connect the temperature door cable.
Connect the center and lower air distributors and the center air outlet ducts.
Connect the center duct to the defroster outlet duct.
Install the glove compartment and door.
Connect the heater hoses at the core tubes.
Connect the negative battery cable. Fill the cooling system and check for leaks.

[lawdog49]

thanks guys, sounds like i may wanna farm this one out to my buddy to do......

[ccz145a]

Don't do it. It's really not that hard, especially compared to some of these newer cars/trucks.

[Captkaos]

Unless he is doing it for free I would do it myself.  It isn't difficult as say a S10, which is a major undertaking.  You can do it.