hvac

  1. Bushoku

    Question about spring-loaded arm tied to HVAC/AC system

    Since I've owned my 1990 K1500, I noticed this spring loaded arm hanging down below my dash (near my right foot) whenever the A/C system is set to defrost. It raises back up for other blower zone settings. I don't understand what it is, and it looks wrong to me -- like the very bottom (a final...
  2. N

    1990 HVAC works when it feels like.

    Hi all, I’ve got a 1990 K3500 I use to plow. All of a sudden, the digital HVAC controller will 9/10 times not turn on with the truck. The back lights are all on, but the screen is black and the buttons do nothing. I checked all the connections behind the glovebox. I removed the unit and...
  3. Misterman

    Good reference photos of HVAC ductwork?

    Been searching for awhile, found a few good photos of the dash removed, anyone have some good pictures of the hvac ductwork? Specifically for 98-2000 style trucks.
  4. westcoastZ71

    Heater blows cold

    Hey yall, my 1995 K1500's heat doesn't work at the moment and I'm not sure why. The heater core is fine, the blend door actuator seems to be working properly, and the truck doesn't have any other coolant system issues. Really hoping to get this dealt with before the weather gets too cold, has...
  5. J

    Blend door actuators

    Hey everyone, likely a silly question, but I was uncertain if all of the blend door actuators on my 1996 Tahoe are the same? I need the one that changes the zone (mode actuator?) it’s located on the drivers side. The one with all the linkage that has the springs built into them. Someone before...
    • Jb87
    • Thread
    • air door actuator hvac
    • Replies: 3
    • Forum: Electronics
  6. BadCompany750

    Third brake light gaskets and other foam and rubber parts!

    I am reproducing some foam and rubber replacement parts for the GMT400 trucks and SUVs. I made a list below of the all the parts I have available. I added the post # with the pictures of the items. I hope to add more items periodically. If you have any special requests, let me know and I'll do...
    • BadCompany750
    • Thread
    • 3rd brake light 3rd brake light gasket chmsl chmsl gasket cup holder gasket gaskets hvac third brake light third brake light gasket
    • Replies: 151
    • Forum: For Sale
  7. W

    HVAC Airbox-to-firewall Seals Now Available!

    If your seals between your HVAC box and firewall are falling apart or missing altogether, there is now a viable solution. These are made from TPU with a foaming additive, giving them the toughness of TPU with the softness of foam. They provide a tight seal against the firewall to help keep the...
  8. 2

    Suburban HVAC Woes

    I have a 1996 Suburban C1500 and I've been having hvac issues since day 1. One of my issues is that my front blower motor works in all speed... But if I turn the fan speed up too high, or drive over ~50mph, the hvac stops pushing air, blower motor still running. The other issue is the rear hvac...
  9. F

    Air door motor location?

    I have a 94 GMC SL1500 with the tick tick tick of an air door motor when keyed on/off. Finally had some time to look at how hard a job it will be. So where is the dang thing? Took out the glove box insert and can see the one in the center of the dash, it's not that one. It's over by the blower...
  10. That98burb

    1998 C1500 Chevy suburban 5.7 front and rear A/C blow warm air

    Okay so I don’t know much about A/C but we’re gonna have to go to the past to get to the present. 2 weeks ago my original 350 blew both head gaskets and in that time my front a/c blew cool not cold and the back a/c blew cold. My uncle swapped the motor to another 350 and after that the front and...
  11. Cunningham Machine

    95-99 GM Truck Billet HVAC Knobs

    Couple new billet products to post here. Sorry for slacking off on posting here. Its a struggle to keep up with all the social media and forum stuff all the time! These are our billet 95-99 HVAC knobs. Pretty straightforward install. Slide the old off (may have to use plies because the old knobs...
  12. P

    Rough Idle with AC on

    Hey yall, so I have a 94 c1500 5.7 v8. The AC ALMOST works. I replaced the ac compressor, orifice tube and the accumulator to get my ac to work kinda right. The only issue is that if I stop at a red light and idle with my ac on then my truck will shutter as the compressor kicks on and off over...
  13. P

    Idling issue with AC on

    1994 C1500 with 5.7 V8 if this matters. So recently I fixed my ac, new compressor, accumulator and orifice tube. It does great, doesn't get the cab ice cold but enough to cool me down. Anyways the issue is when I'm idling. If I stop at a red light my truck will idle at like 300 rpm which I feel...
  14. T

    Ac blowing hot air

    I’m honestly lost on this one I ran a vacuum all night. It held good with no leaks so I added the freon and oil the compressor kicks on and the dryer got cool but not cold and a lot of water was coming out of the drain but it was still blowing hot I went in the cab and checked everything all the...
  15. retmotor

    Power to the HVAC Head

    So yesterday, there I was minding my own business, coming home from the hardware store, when I hopped in the truck and there was no power to the HVAC head. Thankfully it was only 112 degrees (it's been a cool summer this year). Fuse you say? Nope. I saw Schurkey's thread on the connector...
    • retmotor
    • Thread
    • hvac hvac control panel hvac control unit hvac head
    • Replies: 5
    • Forum: Electronics
  16. jeremytn86

    Defrost only blows luke warm, not hot

    So, I have searched here, and the web, trying to find the same issue and/or an answer. I have a 99 K2500 Suburban 6.5 diesel. Front and rear heat is nice and hot. When I put it on defrost though, it is barely warm. Some backstory, I had the blower motor and resistor changed out by Midas when I...
    • jeremytn86
    • Thread
    • blend door blower motor heat a/c ac hvac actuator blend door help hvac resistor
    • Replies: 5
    • Forum: Electronics
  17. Supertex

    93 Complete A/C system replacement - Questions for gurus

    This is long, but supplying all the info is key to resolving problems, so...A/C gurus out there, please chime in. I'm sure you'll be helping more than just me. I just replaced my entire A/C system...what a headache. My system has always lost freon. Over the course of a year it would be all...
  18. Burban1998

    Heated seat switch

    The heated seat switch on my 98 suburban 1500 is broken, does anyone make a replacement? The oem one is discontinued part # is 12376804
  19. southsidesmoka

    Missed with HVAC Parts Shotgun on '99 Suburban

    To Whom It May Concern: Recently, all of the illumination in my HVAC control head died. It was still functional, but I couldn't see it at night. I figured it was my fault - I probably damaged or broke something on the backside of the old control head when I was shoving it and a fire...
  20. B

    98 K2500 - HVAC Control Module Issue

    Hey all, Long time lurker very infrequent poster, I have searched this forum and others high and low and apologize in advance if there's an answer in another thread somewhere, if there is I couldn't find it. Truck is a 1998 K2500 ECLB, originally a 454 truck but has a 6.0 swapped in. 4l80e...
  21. S

    Need help diagnosing blower motor problems.

    I'm getting wrapped around the axle trying to figure out why my blower motor is not working. I replaced the blower motor and resistor 2 months ago. It recently stopped working completely so I started poking around. When the 12v terminal on the motor is jumped, nothing. When the ground terminal...
  22. dudeinthepnw

    Does anyone have the hvac schematic for the control panel? (1990 2500)

    When I got the truck a few months ago, one issue it had was the radio wasn't working. I ordered a retro sound factory unit that still allowed me to have aux etc but also still look factory. I removed the factory stereo and the CMD (I think that's what it's called, the part under the dash that...
  23. nhelmar19

    Can't identify these wires

    I made a previous post about an issue I'm having with my HVAC controls where the temp and vent arrows are flashing. While trying to rule out issues with that I found a light green/dark green set of wires that appear to be cut and I can't find where they would be connected to. I also found the...
  24. Matthew Conley

    HVAC 15-72267 to replace 15-72266

    I have a 1995 with a bad 15-72266 HVAC board. (Has the rear defogger button). When I purchased the truck the original rear glass had been replaced with a slider. The fuse block has a 30 AMP fuse where this truck could have had a defogger. Since i dont have it any more, anyone know if i can...
  25. LoCascio_Inc

    Weak air flow on passenger side vents only?

    1998 2500 extended cab truck, now with a 1996 style 2500 dash and the accompanying upper HVAC ducting. Both dash styles have had really weak air flow on the two passenger HVAC vents near the glovebox. Driver side vents blow great hot or cold but passenger side is always kinda lame. Anyone else...

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