c4 throttle body coolant cover
 

I removed the throttle body on my 1985 vette to clean. I decided to take everything apart and clean and replace all gaskets. While removing the coolant cover off the throttle body, the cover broke and one of the bolts broke off flush to the throttle body. I can buy a new throttle body from anywhere but no one has the coolant cover that attaches to the new throttle body. The new throttle body includes the bolts for the coolant cover but no coolant cover. Since I cant use my old cover, what are my options? I have no problem doing the coolant bypass but without the cover under the throttle body, unfiltered air can enter the intake.

What is a coolant cover? Are you taking about the IAC housing? THIS?

https://cimg9.ibsrv.net/gimg/www.cor...126aaf4225.jpg


https://cimg4.ibsrv.net/gimg/www.cor...2fe94f41cc.jpg
Look at the above unit. Is it any of these 3 screws? If not, it doesn't matter

https://cimg5.ibsrv.net/gimg/www.cor...7b68ecebfd.jpg

Yet another picture for reference as to what is important if you do the coolant bypass.

Many TPI owners install the bypass mod. If I were in your shoes, that'e exactly what I would do. If the bolt isn't broken off in one of the holes needed for the IACV plate then I wouldn't worry about it.

^^ :iagree: ^^

Isn't that just a flat plate just make one

It's a flat plate with a way to attach the IAC solenoid to. I really wouldn't make one since the pintle must mate with the housing for a full close. I would either buy the TPIS one or modify the current one. Whether it is worth your time to grind away is up to your discretion on what your time is worth and if you have the tools. If you had to buy a dremmel with the bits, probably not.

Yes aklim, thanks for the pics. That is the correct part and term. I had a diagram/illustration of all the throttle body components that came with my gasket kit that labeled the IAC housing as "Coolant Cover (IAC)" so I was searching the wrong term. I ended up cutting the IAC valve housing from the rest of the housing like your third photo and of course cut the gasket to fit. I replaced all the bolts on the IAC housing and the clean air cover on top with stainless M4 from True Value Hardware. No one else had them.

I also need to replace this vacuum hose? that goes into the throttle body. I haven't been able to locate the part.
https://cimg4.ibsrv.net/gimg/www.cor...dab73c288f.jpg

Don't forget to anti-seize the screws. I think you already know why.

IDK since those are probably emissions stuff that "fell off" my car. I would guess it is the CCV to the right side valve cover?

I just found this. I didn't want to give you mine since I have an 91 and wasn't sure.

https://cimg9.ibsrv.net/gimg/www.cor...23d2c9cc29.gif