Hi,

I need to clean the inside of my heater core due to lack of heat in the cab. How does it come out? From under the hood or under the dash. I don't have A/C if that makes a diff.

Thank you
Dean

 

Mine is a 1991, I just took mine out yesterday and replaced today. I have A/C and the whole unit(heater core & evaporator core) came out ftom under the dash. Good luck!

 

From under the dash. It's really not that tough of a job. But if you do go to the trouble of removing the core, by all means replace it with a new heater core from NAPA, it's bigger, and will produce more heat.

 

If you just want to clean out the heater box, take a look in the sticky for info.

Figure on about 2 hours to pull the heater core, and another 3 to put it back together. Like Bill said, if you're gonna go to all that trouble you ought to put in a new one. It'd be a real kick in the teeth if the old one started leaking in a couple months.

 

Great idea on replacing the core. I will do that and thanks for the tips.

Dean

 

Dean
Here is a post from a while back that should help.
"Done a bunch of them, heres how.
Remove coolant hoses. Evac Freon, remove insulation pad,blower motor and cover, disconect A/C lines from heater box (and pressure block), remove 6 (+/- 1) nuts that hold the heater box to the fire wall,
Inside truck,
remove glove box door, right kick pannel, heater controll, two screws that hold the air deflector (over the center hump) and deflector, two screws that hold air blend pannel(tucks up under the dash center) and blend pannel, dash brace( near the upper left corner of glove box opening), lower dash attaching bolt (just under the dash, right side kick pannel) and one attaching screw just above accelerator pedal.
Disconect elec conections from heater box, remove vacume lines & gromet from firewall, disconect blend cable (right side of mount under cable gently press tab in and pull cable straight up) remove heater box attaching bolt(under heater box on kick pannel)
Pull dash towords seat enough to let the lower dash mount catch on the door opening
pull heater box away from firewall. lower from under dash while turning firewall side of box towords floor. should slide out.

10 min easy

Hope this helps

Dont use pour in sealers...they dont differentiate a leak from a restriction and tend to seal steam holes in head gaskets and could plug you heater core altogether."

 

That helps alot. Thanks

Dean

 

I have a buddy who is working on my truck right now trying to remove the heater core/ac box from under the dash and its being a PITA.....do any of the top dash bolts have to come out?? The ones that are hidden under the windshield gasket? Reading the info above I would not think so, but he is under the impression that he will have to remove some of them.

Help!

 

The top of the dash stays put, you just have to remove the brace across the bottom. You have to flex the dash just a little, but it doesn't take much force to get it in and out.

What the FSM doesn't tell you is that you have to remove the ABS computer to get the heater box out.