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#1 |
Registered User
Join Date: Nov 2015
Location: Down south
Posts: 518
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Weird AC issue.
I have an 04 Silverado 2500 HD 4x4 with the 6.0, and the 4 speed auto. The air conditioner works fine most of the time, but sometimes the drivers side vents stop blowing cold air (the passenger side still does though). When I turn the truck off a few minutes, and turn back on, everything works again. Does anyone know why this happens? Is there anything I can do about it? Thanks.
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#2 |
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Location: Pace, FL
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Re: Weird AC issue.
Blend door actuator. It's been discussed here a few times, sometimes you can get lucky and reset them. There is a specific procedure for this if you don't have a Tech2. Others have been able to disassemble, clean, and grease them. Some people opt to just change them since they will probably do it again. The driver side blend door actuator is located under the hush panel (if equipped) towards the passenger side over the trans tunnel. It's 3 screws and a wiring harness to pull the old one out.
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1942 Master Deluxe 1969 C/10 1985 Blazer CUCV 1987 Jimmy 2004 Tahoe 2005 Silverado 1500 2005 Silverado 3500 |
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#3 |
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Re: Weird AC issue.
Here's a pic with the hush panel removed. You can see one of the mounting screws and the wiring harness plugged in.
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1942 Master Deluxe 1969 C/10 1985 Blazer CUCV 1987 Jimmy 2004 Tahoe 2005 Silverado 1500 2005 Silverado 3500 |
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#4 |
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Re: Weird AC issue.
Here's the actuators, case removed, and finally a pic of the area that needs to be cleaned. Those 2 tabs under the black gear ride on a strip that gets corroded or dirty. It's been reported that it can be cleaned well with alcohol, greased, and reassembled to work properly.
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1942 Master Deluxe 1969 C/10 1985 Blazer CUCV 1987 Jimmy 2004 Tahoe 2005 Silverado 1500 2005 Silverado 3500 |
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#5 | |
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Location: Wentworth, NH
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Re: Weird AC issue.
Quote:
You can clean copper up with alcohol then brass polish and then more alcohol using a cotton washcloth as an applicator. Make sure to get every drop of the brass polish off and make sure the copper is completely clean. You may have to re-apply the brass polish once or twice depending on how badly the connector is tarnished. I've done this with card edge connectors in antique test gear, antique computers, and antique game cartridges. The last step is to lube it with dielectric grease or, on PC board card edge connections like the VSS and Cruise III modules, Deoxit S5 Shield.
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1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...
And please let us know if and how your repairs were successful. |
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#6 |
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Location: Pace, FL
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Re: Weird AC issue.
I'm not sure what the strips are made of. Here are a few more pics if it clears anything up. There's not much to these things and from the caked up grease, I wonder if they just get sticky over time.
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1942 Master Deluxe 1969 C/10 1985 Blazer CUCV 1987 Jimmy 2004 Tahoe 2005 Silverado 1500 2005 Silverado 3500 |
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#7 |
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Re: Weird AC issue.
Few more
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1942 Master Deluxe 1969 C/10 1985 Blazer CUCV 1987 Jimmy 2004 Tahoe 2005 Silverado 1500 2005 Silverado 3500 |
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#8 |
Registered User
Join Date: Nov 2015
Location: Down south
Posts: 518
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Re: Weird AC issue.
Thanks for the info, and awesome pictures. I will try this.
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#9 |
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Location: Bradenton, Fla.
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Re: Weird AC issue.
My actuator makes a clicking sound sometimes..... (gears slipping)....
Driver's side was not getting A/C a few times, but so far it hasen't done it for a long while. I bought a replacement. It's in my garage when it finally fails.
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'70 GTO Midnight Blue '88 GMC Sierra SLE 392,000 miles-(2018) sold to Classic car shop in Germany. '93 Cadillac STS Black '93 Mercedes SL 500 Teal '86 Yamaha FZ750 - 15,000 RPM '86 Yamaha FJ1200 - Criminally Fast 2016 Ferrari 488 GTB, I drive it - don't own it. '05 GMC Yukon XL , SLT 4wd ( just purchased 2018) |
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#10 |
Registered User
Join Date: Nov 2015
Location: Down south
Posts: 518
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Re: Weird AC issue.
I cleaned mine yesterday. So far, so good. We'll see how long it lasts. I cant help but to be a little frustrated with AC system and all of its electronics on these newer trucks, especially when I drive my '85 C10 around and feel the cold air hit me. The cable actuated system has yet to fail, even after 30+ years. The electric motor actuated system on the other hand has plagued the gmt800s since they were new.
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#11 |
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Location: Bradenton, Fla.
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Re: Weird AC issue.
Yea, I've seen gears like that before. In toys.
The slipping gear noise is just like when my CD tray at home won't close!!
__________________
'70 GTO Midnight Blue '88 GMC Sierra SLE 392,000 miles-(2018) sold to Classic car shop in Germany. '93 Cadillac STS Black '93 Mercedes SL 500 Teal '86 Yamaha FZ750 - 15,000 RPM '86 Yamaha FJ1200 - Criminally Fast 2016 Ferrari 488 GTB, I drive it - don't own it. '05 GMC Yukon XL , SLT 4wd ( just purchased 2018) |
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#12 |
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Location: Pace, FL
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Re: Weird AC issue.
How did the cleaning fix work out so far? I'm working on my sister's Tahoe now that apparently has 4 bad actuators on front and rear AC and would like to try cleaning instead of her spending a few hundred on new ones.
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1942 Master Deluxe 1969 C/10 1985 Blazer CUCV 1987 Jimmy 2004 Tahoe 2005 Silverado 1500 2005 Silverado 3500 |
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#13 |
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Location: Pace, FL
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Re: Weird AC issue.
I'm hoping Wyatt has had some success with it so far. I only have the truck to work on for a few days so I don't have time to order from a cheaper source, and 2 of the actuators are the pricey ones which are $141 each locally. I'm going to try pulling the 2 rears and the driver side blend door actuator and cleaning them first. She hasn't been worried about it since she lives in WV, but now that she's down here visiting it would be nice to have working AC.
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1942 Master Deluxe 1969 C/10 1985 Blazer CUCV 1987 Jimmy 2004 Tahoe 2005 Silverado 1500 2005 Silverado 3500 |
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#14 | |
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Join Date: Nov 2015
Location: Down south
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Re: Weird AC issue.
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#15 |
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Re: Weird AC issue.
Thanks for the reply. I gave it a shot today and cleaned one of the buggy ones and so far, so good. We'll see how long it holds.
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1942 Master Deluxe 1969 C/10 1985 Blazer CUCV 1987 Jimmy 2004 Tahoe 2005 Silverado 1500 2005 Silverado 3500 |
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#16 |
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Re: Weird AC issue.
That looks like conductive carbon similar to remote control boards and buttons.
The dried up dielectric grease they used can be cleaned off and replaced. If it works after cleaning and re-greasing let it ride.
__________________
1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...
And please let us know if and how your repairs were successful. |
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#17 |
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Location: Central Coast California
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Re: Weird AC issue.
Sounds like fixing the lower actuator worked for you.
Here's a link for changing the upper acuator: https://www.instructables.com/id/How...de-temp-contr/ The upper looks like a major pain! Does anyone have a flow diagram of the A/C system to get a better idea of what actuator location controls what function? I think there's 3 or 4 different actuators and they differ on what style A/C dash controller you have. This looks like it could be such a major hassle!!!!
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1972 K20 Suburban 5.7/700r4/NP205 Dana 44/H052 Sold ![]() 1972 C10 5.3L/4L60E 12bolt 5Lug - Sold ![]() 1971 K5 Blazer 6.0L LQ9 4L60E NP205 Dana 44/H052!!! ![]() 1970 K3500 1ton CrewCab 8.1L/Allison1000/NP205 Dana 60/14B!!!! - Sold ![]() ![]() ![]() 1984 K10 SWB 7.4L/4L80e/NP208 Corp 10/12 bolt Sold ![]() 1988 V30 CCLB 7.4L/TH400/NP205/Dana 60/Dana 70/3.73!!! (Sold) ![]() 2003 K2500HD 8.1/Allison1000/NP263 ![]() |
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#18 |
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Location: Central Coast California
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Re: Weird AC issue.
Well I took off my lower actuator and fixed the same problem as the OP.
Once you pull off the actuator you can turn the blend door open/closed by hand to confirm the air flow changes. Once I turned it by hand I was able to get cold air to the driver side. My actuator was stuck...water got into the case and rusted the motor. Now I have to find out where the water came from..... outside leak or condensation from the a/c system. It wasn't antifreeze from the heater core. Thanks for posting your answers/experience!
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1972 K20 Suburban 5.7/700r4/NP205 Dana 44/H052 Sold ![]() 1972 C10 5.3L/4L60E 12bolt 5Lug - Sold ![]() 1971 K5 Blazer 6.0L LQ9 4L60E NP205 Dana 44/H052!!! ![]() 1970 K3500 1ton CrewCab 8.1L/Allison1000/NP205 Dana 60/14B!!!! - Sold ![]() ![]() ![]() 1984 K10 SWB 7.4L/4L80e/NP208 Corp 10/12 bolt Sold ![]() 1988 V30 CCLB 7.4L/TH400/NP205/Dana 60/Dana 70/3.73!!! (Sold) ![]() 2003 K2500HD 8.1/Allison1000/NP263 ![]() |
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#19 | |
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Join Date: Nov 2015
Location: Down south
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Re: Weird AC issue.
Quote:
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#20 | |
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Location: Bradenton, Fla.
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Re: Weird AC issue.
Quote:
Full agreement..... Anything to fix under a dash is never fun..... Unless the front seats remove easily. Which they don't.
__________________
'70 GTO Midnight Blue '88 GMC Sierra SLE 392,000 miles-(2018) sold to Classic car shop in Germany. '93 Cadillac STS Black '93 Mercedes SL 500 Teal '86 Yamaha FZ750 - 15,000 RPM '86 Yamaha FJ1200 - Criminally Fast 2016 Ferrari 488 GTB, I drive it - don't own it. '05 GMC Yukon XL , SLT 4wd ( just purchased 2018) |
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#21 | |
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Location: Wentworth, NH
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Re: Weird AC issue.
Quote:
The nuts are E-Torx or External Torx. There's not a lot of clearance round the nuts so you'll want a decent quality socket set not the cheapies with thick socket walls. The dash is an absolute SOB to deal with.
__________________
1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...
And please let us know if and how your repairs were successful. |
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#22 | |
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Location: Central Coast California
Posts: 1,026
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Re: Weird AC issue.
Quote:
Thanks for the tip. I looked up leaking evap core and it sounds like it should be gas vapor only. But, a clogged drain channel will lead to water in the footwell. Anyone know if/where a drain tube would be?
__________________
1972 K20 Suburban 5.7/700r4/NP205 Dana 44/H052 Sold ![]() 1972 C10 5.3L/4L60E 12bolt 5Lug - Sold ![]() 1971 K5 Blazer 6.0L LQ9 4L60E NP205 Dana 44/H052!!! ![]() 1970 K3500 1ton CrewCab 8.1L/Allison1000/NP205 Dana 60/14B!!!! - Sold ![]() ![]() ![]() 1984 K10 SWB 7.4L/4L80e/NP208 Corp 10/12 bolt Sold ![]() 1988 V30 CCLB 7.4L/TH400/NP205/Dana 60/Dana 70/3.73!!! (Sold) ![]() 2003 K2500HD 8.1/Allison1000/NP263 ![]() |
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#23 | |
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Re: Weird AC issue.
Quote:
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#24 | |
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Location: Central Coast California
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Re: Weird AC issue.
Quote:
That totally skipped removing the airbag, etc, on the passenger side. Not sure which one i’d do if the time came... ![]()
__________________
1972 K20 Suburban 5.7/700r4/NP205 Dana 44/H052 Sold ![]() 1972 C10 5.3L/4L60E 12bolt 5Lug - Sold ![]() 1971 K5 Blazer 6.0L LQ9 4L60E NP205 Dana 44/H052!!! ![]() 1970 K3500 1ton CrewCab 8.1L/Allison1000/NP205 Dana 60/14B!!!! - Sold ![]() ![]() ![]() 1984 K10 SWB 7.4L/4L80e/NP208 Corp 10/12 bolt Sold ![]() 1988 V30 CCLB 7.4L/TH400/NP205/Dana 60/Dana 70/3.73!!! (Sold) ![]() 2003 K2500HD 8.1/Allison1000/NP263 ![]() |
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#25 |
Registered User
![]() Join Date: Jun 2011
Location: Bradenton, Fla.
Posts: 1,100
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Re: Weird AC issue.
I'll be changing my lower actuator sometime....... even though it does the 'clicking', it is still is working
__________________
'70 GTO Midnight Blue '88 GMC Sierra SLE 392,000 miles-(2018) sold to Classic car shop in Germany. '93 Cadillac STS Black '93 Mercedes SL 500 Teal '86 Yamaha FZ750 - 15,000 RPM '86 Yamaha FJ1200 - Criminally Fast 2016 Ferrari 488 GTB, I drive it - don't own it. '05 GMC Yukon XL , SLT 4wd ( just purchased 2018) |
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