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Print in friendly format Send this term to a friend  Shark
Any Corvette from model year 1968 to 1982 is loosely referred to as a Shark. Stemming from the Mako concepts and a general acceptance that the C3 lo...
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#1 Is the water heater shut off valve required?
85vet Posted on: 2008/2/9 13:13
Noticed a slight anti-freeze leak and finally found it. The water shut off valve for the heater is leaking. it is part of the solid tubing section of the heater/water lines in the engine compartment and has a vacuum line going to it.
I see that these were only installed on 85 through 87 so I am wondering if it can be completely bypassed and eliminated.

I would appreciate your comments.

Thanks,
Jim

#2 RE:Is the water heater shut off valve required?
bogus Posted on: 2008/2/9 13:38
bypass it as in bypass the heater? or just run straight to the heater core?

There is a steam vent off the back of the engine that attaches to the valve rig you refer too... I donno what that will do in the long run.

#3 RE:Is the water heater shut off valve required?
MK 82 Posted on: 2008/2/9 13:42
You can take it out and replace with heater hose. A manual shutoff valve would be a good idea.

#4 RE:Is the water heater shut off valve required?
85vet Posted on: 2008/2/9 14:52
Quote:
bypass it as in bypass the heater? or just run straight to the heater core?

There is a steam vent off the back of the engine that attaches to the valve rig you refer too... I donno what that will do in the long run.


Interesting, I only see a vacuum line that attaches to the valve. I want to eliminate the hard lines that the bypass valve is part of and run heater hoses directly to the heater core.
If our systems are closed where would steam come from?
Sorry if this might be a stupid question.
Thanks, Jim

#5 RE:Is the water heater shut off valve required?
85vet Posted on: 2008/2/9 14:55
Quote:
You can take it out and replace with heater hose. A manual shutoff valve would be a good idea.


Not sure why I need a shut-off valve, the current valve had no effect when my heater core died, it leaked inside the car. I bypassed the heater completely until I replaced the heater core.

#6 RE:Is the water heater shut off valve required?
Agent86 Posted on: 2008/2/9 15:16
Not needed as proven by later C4's that didn't get the valve. Mine leaked too, so I cut the bitch out.
Click to see original Image in a new window

#7 RE:Is the water heater shut off valve required?
85vet Posted on: 2008/2/9 16:18
Thanks Agent 86 - that's what I wanted to see.

#8 RE:Is the water heater shut off valve required?
MK 82 Posted on: 2008/2/9 16:42
Quote:
Quote:
You can take it out and replace with heater hose. A manual shutoff valve would be a good idea.


Not sure why I need a shut-off valve, the current valve had no effect when my heater core died, it leaked inside the car. I bypassed the heater completely until I replaced the heater core.


Two reasons.
1. Without the valve, water will flow through the heater core at all time. If your ducts are tight and all the doors works OK it is not a problem

2. If the heater puts out hot air when you don't want it or you develop the dreaded core leak you can shut it off.

#9 RE:Is the water heater shut off valve required?
CasetheCorvetteman Posted on: 2008/2/9 17:41
DropTopCE, the coolant does run through the heater core all the time on 92 and up. No good reason not to.

With the coolant running through the core all the time and not sitting still for months, youre not having coolant go stagnant in the core, and as long as youre looking after youre cooling system, the heater core should last longer with coolant flowing full time.

#10 RE:Is the water heater shut off valve required?
MK 82 Posted on: 2008/2/9 17:46
Quote:
DropTopCE, the coolant does run through the heater core all the time on 92 and up. No good reason not to.

With the coolant running through the core all the time and not sitting still for months, youre not having coolant go stagnant in the core, and as long as youre looking after youre cooling system, the heater core should last longer with coolant flowing full time.


Good, then he can leave it open till something goes wrong. Entirely optional but I would do it. Maybe I am the paranoid type. YMMV.

#11 RE:Is the water heater shut off valve required?
Touringmike Posted on: 2008/2/9 17:48
Quote:
You can take it out and replace with heater hose. A manual shutoff valve would be a good idea.


Well, I replaced my steel tubes with 3/4 and 5/8 hoses (I think, it was 6 years ago).

If the heater core ever leaks, I'll just remove the hoses from the core and butt them together. I never use the heater anyway (car's in storage for the winter months)

#12 RE:Is the water heater shut off valve required?
CasetheCorvetteman Posted on: 2008/2/9 22:06
Quote:
Good, then he can leave it open till something goes wrong. Entirely optional but I would do it. Maybe I am the paranoid type. YMMV.

If something goes wrong, closing the tap wont stop the core from leaking, the coolant can still go in from the other end.

#13 RE:Is the water heater shut off valve required?
CFI-EFI Posted on: 2008/2/10 18:45
My car had the water shutoff valve bypassed and removed over 21 years ago. There have been no adverse effects.

RACE ON!!!

#14 RE:Is the water heater shut off valve required?
85vet Posted on: 2008/2/10 22:38
Thanks for all the input. I don't think I need it, but I will check to see if I can buy it used for reasonable $'s, otherwise it is GONE.

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