90 Evaporator Housing/Heater Box R/I Tips ? - ZR-1 Net Registry Forums

Corvette95 · 03-21-2020

I pulled the evaporator housing on my 90 to remove the right side cam cover. The housing is off, I did it without disconnecting the evaporator and discharging the a/c . I searched for a "how to tip" but didn't find anything useful nor was the SM very good. Is there any good write ups on this or any tips to reinstall? The two 7mm screws on the engine side bottom of the box was a huge tasks. Should I go ahead and discharge the a/c and pull the lines? What is the best way to tackle this as there is no "easy" way. Thanks. ( I know I need to make sure the seal to cowl is tight on reinstall). Hope everyone is staying safe and healthy.

Corvette95 · 03-22-2020

anyone?

Coupe89 · 03-24-2020

No tips here. Those 2 bolts are a bitch. I didn't reinstall my bolts yet....

Jagdpanzer · 03-24-2020

I use a 1/4” drive ratchet and long extension to get at the 7mm head screws located on underside of the AC temperature control cover. Come in from the front side and use a mirror if you have to to line up wit the screw that goes in the firewall. Leave the Freon lines and evaporator alone. I’ve never had to remove anything further to get at the right hand cam cover or remove the engine

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03-21-2020	#1
Corvette95 Join Date: Jan 2006 Location: Decatur, AL Posts: 1,119	90 Evaporator Housing/Heater Box R/I Tips ? I pulled the evaporator housing on my 90 to remove the right side cam cover. The housing is off, I did it without disconnecting the evaporator and discharging the a/c . I searched for a "how to tip" but didn't find anything useful nor was the SM very good. Is there any good write ups on this or any tips to reinstall? The two 7mm screws on the engine side bottom of the box was a huge tasks. Should I go ahead and discharge the a/c and pull the lines? What is the best way to tackle this as there is no "easy" way. Thanks. ( I know I need to make sure the seal to cowl is tight on reinstall). Hope everyone is staying safe and healthy. __________________ Corvette95 Registry and Forum (*************) 1989 C4 Conv Wht/Gry Auto Hardtop Top Flight SOLD 1995 C4 Coupe Purple/Blk 6 Speed 1989 C4 Conv Wht/Red Auto SOLD 1996 C4 Conv Black/Tan Auto SOLD 1994 C4 Coupe Wht/Blk SOLD 1995 C4 ZR-1 White/Gry #278 Dual Dunn Head SOLD 1986 C4 Coupe Black/Red 4+3 SOLD 1990 C4 ZR-1 Red/Red #0454

03-22-2020	#2
Corvette95 Join Date: Jan 2006 Location: Decatur, AL Posts: 1,119	Re: 90 Evaporator Housing/Heater Box R/I Tips ? anyone? __________________ Corvette95 Registry and Forum (*************) 1989 C4 Conv Wht/Gry Auto Hardtop Top Flight SOLD 1995 C4 Coupe Purple/Blk 6 Speed 1989 C4 Conv Wht/Red Auto SOLD 1996 C4 Conv Black/Tan Auto SOLD 1994 C4 Coupe Wht/Blk SOLD 1995 C4 ZR-1 White/Gry #278 Dual Dunn Head SOLD 1986 C4 Coupe Black/Red 4+3 SOLD 1990 C4 ZR-1 Red/Red #0454

03-24-2020	#3
Coupe89 Join Date: Aug 2009 Location: Livermore, Ca Posts: 204	Re: 90 Evaporator Housing/Heater Box R/I Tips ? No tips here. Those 2 bolts are a bitch. I didn't reinstall my bolts yet.... __________________ 1990 ZR-1 #642

03-24-2020	#4
Jagdpanzer Join Date: Apr 2007 Location: Northern VA Posts: 2,658	Re: 90 Evaporator Housing/Heater Box R/I Tips ? I use a 1/4” drive ratchet and long extension to get at the 7mm head screws located on underside of the AC temperature control cover. Come in from the front side and use a mirror if you have to to line up wit the screw that goes in the firewall. Leave the Freon lines and evaporator alone. I’ve never had to remove anything further to get at the right hand cam cover or remove the engine Sent from my iPhone using ZR-1 Net Registry __________________ Phil Wasinger 1994 Torch Red ZR-1 WAZOO Member George Braml Intake Last edited by Jagdpanzer; 03-24-2020 at 09:43 AM.