I have a 99 Siverado is only blowing warm air, not hot. I took it to a dealer and they say the heater core needs to be replaced and want to charge $800+ to do it. I am not convinced it is the heater core. The truch warms up fine so I don't think it is the t'stat. I had a guy tell me my coolant system may need flushed and the heater core may just be clogged with something. I had another guy tell me he was told his heater core was bad, but it ended up being a ball point pin that had fallen into his defrost vent and keeping the damper from opening/closing properly. I know there is something in there because I have heard someting sliding around in there before. When I have the blower on #2 I can hear what sounds like something flappin in side the defrost vents, but it only does it on #2. I started to tear into the dash to see if I can get to the duct work, but what a pain. Can anybody give me thier thoughts on what may be wrong? Does anybody have some step by step instruction on how to take the dash apart? I have popped of the molding that goes around the radio and heater controls and popped off both side panels and removed the two screws. I can figure out how to get the handle above the air bag on the passenger side off.
Sorry for the long post, but any assistance would be greatly appreciated.
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I'm don't want to take the dash apart to replace the core, I am just trying to get to the duct work to see if there is anything in there. I thought if I could get the top of the dash out of the way, I could see down in there. Have you ever heard of something getting lodged in the duct and causing issues with the hot/cold dampener opperating correctly?
I noticed tonight that my heater is making noises when I turn it off and some times when I switch between blower/air output locations with the ****.
One was pretty hot, the other was just warm. Does this mean it is just clogged or could it be bad? The dealership wants to replace the core, but a local guy wants to replace the t'stat and flush the system.
I just went through this same problem a month ago in my 98 silverado. I opened the black box under the glove box. Very easy. Just remove the 5-7 screws holding the bottom of the box to the top. then I saw the heater coil lying on the floor of the box. The air coming from the fan was blowing over the coil and not through it. I wired the coil back into the box because to tabs designed to hold the coil in were broken and reattached the bottom end of the box. Now I have solid heat. I didn't have to remove the dash to fix this.