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69GMCLonghorn · 05-27-2009, 04:50 PM

There are 3 levers:
One for the defroster (not the problem)
2nd is for the amount of air coming in (middle lever). The other end of this one is inside the cab on the bottom of the heater box. Make sure this is fully closed.
3rd is the heat regulator. With mine, the cable keeps coming off the pin on the door. There's a small rubber boot that covers it up on the inside of the firewall (pass. side). Pull that boot out and make sure the cable is connected and that the door shuts.

As stated by 6772owner, there's probably an entire tree's worth of sh** in there. You may need to take a 12 pack and a Saturday afternoon and pull the heater assembly off the firewall and clean it out. You have to drop the inner fender well down to get to a couple bolts.

Oh and if you do this, plan on the truck being in pieces for a week, because you're going to see a thousand other things that you want to clean up, fix, paint, replace in the process.

HAVE FUN!

05-27-2009, 04:50 PM	#4
69GMCLonghorn Registered User Join Date: Dec 2006 Location: Porter Ranch, CA Posts: 978	Re: Heat keeps blowing and blowing... There are 3 levers: One for the defroster (not the problem) 2nd is for the amount of air coming in (middle lever). The other end of this one is inside the cab on the bottom of the heater box. Make sure this is fully closed. 3rd is the heat regulator. With mine, the cable keeps coming off the pin on the door. There's a small rubber boot that covers it up on the inside of the firewall (pass. side). Pull that boot out and make sure the cable is connected and that the door shuts. As stated by 6772owner, there's probably an entire tree's worth of sh** in there. You may need to take a 12 pack and a Saturday afternoon and pull the heater assembly off the firewall and clean it out. You have to drop the inner fender well down to get to a couple bolts. Oh and if you do this, plan on the truck being in pieces for a week, because you're going to see a thousand other things that you want to clean up, fix, paint, replace in the process. HAVE FUN!