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01-23-2020
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#1 |
 
Join Date: Apr 2017
Location: Wayne Illinois
Posts: 402
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HVAC Plenum issues
Has anyone removed their complete plenum? Not just the heater core, but the housing the heater core mounts to?
I have to replace a locked up Blend Door Actuator which requires the entire plenum to be removed. I just can't quite get it. If anyone has some input, it would be greatly appreciated. Dan
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 91-#1935 Black/black & gray, Haibeck 500 Cams by Pete |
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01-23-2020
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#2 | |
 
Join Date: Apr 2007
Location: Lake Bluff, IL
Posts: 2,096
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Re: HVAC Plenum issues
Quote:
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2016 Long Beach Red Z06 #10281 "POPS Z" 1995 Polo Green #409 "WARP TEN"--Haibeck 350/510 package, 4.10s, Hurst, Stock Exhaust with QTP Cutouts --Sold but still running strong 1993 Quasar Blue #161 "HIL KING" --Sold but still running strong, now with more than 120,000 miles 1967 Marlboro Maroon/Saddle Corvette Coupe 300 hp/4-spd --Sold a long time ago ZR-1 Net Registry Founding Member #95 NCM Lifetime Member Favorite Quote--Attributed to Mickey Thompson: "Too Much Horsepower is Almost Enough" |
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01-23-2020
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#3 |
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Join Date: Apr 2017
Location: Wayne Illinois
Posts: 402
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Re: HVAC Plenum issues
The car is not able to go anywhere right now. It is not at all drive-able.
The dash is really torn apart, lots of work needed in there. The plenum is apart & the heater core are out. The heater core I replaced a year or so ago was leaking (thanks China). This time I have an OEM heater core to install! I just can't figure out how to remove the forward half of the HVAC plenum.
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91-#1935 Black/black & gray, Haibeck 500 Cams by Pete |
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01-23-2020
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#4 |
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Join Date: Apr 2017
Location: Wayne Illinois
Posts: 402
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Re: HVAC Plenum issues
I GOT IT!!!
You have to remove the evaporator and both sides of the evap plenum. Not an easy task. Some of the evap plenum attachments are dual purpose. They are studs mounted to the HVAC plenum, go thru the firewall & attach the Evap plenum. The HVAC front section is sealed to the firewall by some really sticky sealing tape, don't know how I am going to try to figure out how to reseal it. But, I can access the blend door actuator now!!! I didn't want to redo this job again.... So I hunted down a NOS Blend Door Actuator. None of that Chinese crap parts. Tomorrow it starts going back together!
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91-#1935 Black/black & gray, Haibeck 500 Cams by Pete |
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01-25-2020
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#5 |
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Join Date: Apr 2017
Location: Wayne Illinois
Posts: 402
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Re: HVAC Plenum issues
This was quite a project, this is how far the car had to be torn down to get to the Blend Door Actuator. Now I hope I can remember how to put it all back together now. It took about 7 hours to get this far. The under-dash wiring was a mess. It took maybe 30 zip ties to get it cleaned up this far.
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91-#1935 Black/black & gray, Haibeck 500 Cams by Pete |
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01-26-2020
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#6 |
 
Join Date: Jan 2012
Location: Wisconsin
Posts: 887
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Re: HVAC Plenum issues
What a job!
Thanks for posting your results and the pics.
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1990 ZR-1 #2180 Red/Black Many of the usual mods for 460HP, tuned by Marc Haibeck ZR-1 Net Registry Member #1548 
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