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#1 |
![]() Join Date: Jan 2006
Location: Decatur, AL
Posts: 1,112
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I removed my thermostat housing since I had the room, I went through the solutions, seems to be a lot of issues about which thermostat will work and which won't. I ordered a 180 degree "fail safe" thermostat from RockAuto and gasket/seal (pic below minus seal) . It looks correct as to what was posted online, but the thread was from 2013. I don't have the new thermostat in my hands yet, it is due to arrive Monday. What is so different about the LT5 thermostat? I also want to get a new plastic retainer for the housing (see pics below), and maybe a new coupler if available. There is only one bolt holding the thermostat housing on, what precautions should I take in removing the old thermostat and installing a new one? It looks pretty simple with the housing off, but have read many threads saying how difficult it is to get the housing back on with the seal in place. I know to when it comes to it, I need to get the air out, there are several different methods, I was going to try to reverse bleed it with air blowing in from the driver side and using vacuum at the tank....suggestions? See pics below...I am planning on soda blasting the housing before I put it back on. (1990)
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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 |
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#2 |
![]() Join Date: Dec 2015
Location: Colorado
Posts: 69
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For the nipple (coupler), Jerry has you covered. https://www.jerrysgaskets.com/nipple...urn-90-95-7c4/
Use care when removing this nipple. I have read about them breaking off in the housing. Dorman 800-407 for the retainer clip. The large is 3/4”, the nipple side is 5/8”, but it is included with the new nipple from Jerry. Putting the thermostat in is a piece of cake when the whole housing is out of the car. Jerry used to sell the correct thermostat. Doesn’t look like he has them in stock now. I believe Stant is the correct brand, but can be a crapshoot on whether what is in the box is the right one. Marc Haibeck has good articles on refilling the coolant.
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1991 ZR-1 #1900 Black/Black ![]() |
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#3 | |
![]() Join Date: Jan 2006
Location: Decatur, AL
Posts: 1,112
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Thanks! I have had pretty good luck with bolts not breaking so far, only victim was the small single butterfly plate brass screws in the throttle body. Let the cam covers bolts sit with WD40 for 4 days. Letting the nipple on this sit with WD40 now.
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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 |
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#4 |
![]() ![]() Join Date: Aug 2009
Location: South Dakota/California
Posts: 3,794
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#5 |
![]() Join Date: Jan 2006
Location: Decatur, AL
Posts: 1,112
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Thanks, I read that posts, but can't I use the thermostat I ordered?
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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 |
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#6 |
![]() Join Date: Dec 2003
Location: Arcadia,OK
Posts: 3,384
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owwdee is right about being careful removing the heater hose connector on the T-stat housing. It's not made from steel. It's a fragile, pot metal and breaks easily after all these years of corrosion. Soaking in a good penetrant for a day or so and heating the housing before trying to break it loose could help. Once it is removed, you should chase the threads in the housing to clean them up. The thread is a NPT, which is a tapered thread, so run the tap deep enough to clean up the threads, but no deeper than what is necessary.
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Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 ZR-1, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed. |
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#7 | |
![]() Join Date: Jan 2006
Location: Decatur, AL
Posts: 1,112
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I don't think I have a chaser that big at home and we are under quarantine. I have been paying for UPS pick up service to send out the parts for porting to Pete, FPR for rebuild to Jagdpanzer and tensioner to Marc H
Do you know the thread size off hand, I might can get one from Amazon. (this is why I have time to work on the car right now, my business is closed) Quote:
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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 |
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#8 |
![]() Join Date: Jan 2006
Location: Decatur, AL
Posts: 1,112
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I got the coupling off... used heat, it was very tight, but came off, threads look ok, would certainly run a chaser through them if I can, the 13 mm bolt that is still on the thermostat cover is being difficult. It is soaking in WD40 right now. I ad sprayed both of them yesterday afternoon and let them sit over night.
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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 |
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#9 |
![]() Join Date: Jun 2006
Location: Sparks, NV
Posts: 2,852
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Be careful with the thermostats you receive from suppliers. More often that not their wrong. Only the Stant long thermostat with the cut outs in the bottom piece is correct. I actually got a wrong thermostat in a correct Stant box! Read what happened to me...
H ![]() http://www.zr1.net/forum/showthread....824#post280824
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90'ZR-1 #1461 Red/Black Ported Intake, Degreed Cams, OBX Headers & Exhaust, Fidanza FW, Secondary Delete, Custom tune, C6 GS Wheels. Sold 08 C6 Z51 Crystal Red Metallic Sold Vararam Intake, Tune, Sold 05 C6 Z51 Red/Black Sold 90'ZR-1 #1723 Black/Gray Sold but not forgotten 91' Z51 L98 White Vert. My First, you always remember your first. Sold. Last edited by Ccmano; 03-29-2020 at 06:51 PM. |
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#10 |
![]() Join Date: Jan 2006
Location: Decatur, AL
Posts: 1,112
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I read the thread, what is special about the stant other than the two cut outs, I saw the Delco one you bought, why was that not usable? I haven't located a Stant. Here is my OE one...
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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 |
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