'56 Y-block 292 heater valve leaking again


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By Dean Carriveau - 3 Weeks Ago
I've replaced my vacuum heater valve three time in the last 8  years on my '56 292 y-block Sunliner.  I buy the Dole OEM valve (not cheap) and can only get one or two  years out of them before they begin to weep coolant from the bottom holes.  I thought it might be too high pressure in my cooling system and went to a lower pressure cap.  The last valve I replaced began leaking again today after a little over two years.  These are brand new Dole valves so I don't believe the rubber diaphragm can be aged or brittle for as little as the car is driven.  We usually only drive it less than 2,000 miles per year.  I've rebuilt the vacuum system and really want the heat control to work as original from the dash control or I'd go with a manual shutoff valve.  Any thoughts or similar experience?    Thanks,   Dean Carriveau 
By 55blacktie - 3 Weeks Ago
Dean Carriveau (7/4/2026)
I've replaced my vacuum heater valve three time in the last 8  years on my '56 292 y-block Sunliner.  I buy the Dole OEM valve (not cheap) and can only get one or two  years out of them before they begin to weep coolant from the bottom holes.  I thought it might be too high pressure in my cooling system and went to a lower pressure cap.  The last valve I replaced began leaking again today after a little over two years.  These are brand new Dole valves so I don't believe the rubber diaphragm can be aged or brittle for as little as the car is driven.  We usually only drive it less than 2,000 miles per year.  I've rebuilt the vacuum system and really want the heat control to work as original from the dash control or I'd go with a manual shutoff valve.  Any thoughts or similar experience?    Thanks,   Dean Carriveau 

Yours is not an uncommon complaint. Regardless of brand, there can't be many companies manufacturing the HCV. As far as I know, they are made off-shore. I'm eliminating mine and replacing it with a manual valve. Although I bought the manual valve from one of the Thunderbird suppliers (probably Casco), you should be able to get one from your local parts store; they are universal, not vehicle-specific. Some have a plastic housing, some metal. I don't know which is better.
By KULTULZ - 3 Weeks Ago
CLICK HERE - https://carglassadvisor.com/top-7-best-coolant-test-strips/

Are the valve(s) you are using NOS?

Which style?

http://forums.y-blocksforever.com/uploads/images/b5c74fce-d428-4059-8c95-704f.png

http://forums.y-blocksforever.com/uploads/images/5e0ebfab-43a3-4f31-9fed-3fed.jpg
By paul2748 - 3 Weeks Ago
When the last one of mine went south, I put in  a mechanical on/off valve, a kit I got from CASCO designed for a Bird.  Works off the stock heater control.  I was lucky - it went south just as I was pulling into the garage after being out.
By 55blacktie - 3 Weeks Ago
paul2748 (7/4/2026)
When the last one of mine went south, I put in  a mechanical on/off valve, a kit I got from CASCO designed for a Bird.  Works off the stock heater control.  I was lucky - it went south just as I was pulling into the garage after being out.


Plastic or metal? How long did it last?
By paul2748 - 2 Weeks Ago
The CASCO kit or the original type?  Don't remember on the original type.  The CASCO plastic unit lasted abut 4 years, found the exact replacement on the internet and I've had   now  is about 6 years

it
55blacktie (7/5/2026)
paul2748 (7/4/2026)
When the last one of mine went south, I put in  a mechanical on/off valve, a kit I got from CASCO designed for a Bird.  Works off the stock heater control.  I was lucky - it went south just as I was pulling into the garage after being out.


Plastic or metal? How long did it last?
By 55blacktie - 2 Weeks Ago
paul2748 (7/5/2026)
The CASCO kit or the original type?  Don't remember on the original type.  The CASCO plastic unit lasted abut 4 years, found the exact replacement on the internet and I've had   now  is about 6 years

it
55blacktie (7/5/2026)
paul2748 (7/4/2026)
When the last one of mine went south, I put in  a mechanical on/off valve, a kit I got from CASCO designed for a Bird.  Works off the stock heater control.  I was lucky - it went south just as I was pulling into the garage after being out.

I can live with that. Thanks, Paul.
Plastic or metal? How long did it last?
By oldcarmark - 2 Weeks Ago
Napa H964 Manual Shut-off Valvehttp://forums.y-blocksforever.com/uploads/images/d17c483e-2cf9-4c03-873f-8515.jpg
By paul2748 - 2 Weeks Ago
Mine is an inline valve, operable from the stock dash control.  The unit is near the firewall, about halfway under the heater duct

oldcarmark (7/6/2026)
Napa H964 Manual Shut-off Valve