[von]

I have the factory type vacuum operated heater hose shut off valve on my factory AC Malibu. It's fairly new but I don't think it shuts off the coolant completely. Is there a compact manual shut off valve available that I can install?

 

[sbvelleman]

Here's an old post that might have what you're looking for: http://www.chevelles.com/forums/showthread.php?t=399043&highlight=

 

[O'Man]

I have the factory type vacuum operated heater hose shut off valve on my factory AC Malibu. It's fairly new but I don't think it shuts off the coolant completely. Is there a compact manual shut off valve available that I can install?

I used one like the one in Post # 5. I added a water pump inlet / outlet nipple in each end of the valve (McMaster has these valves with female NPT pipe threads in each end). I installed the shut off in the heater hose just inside the engine compartment, just beyond the firewall. It is more or less "hidden" under the POA valve (Factory A/C car), down near the hood hinge and provides a nice neat, clean install. The one I used has a small "thumb lever" for the shut off as opposed to a screw that is turned with a screwdriver to turn off the water.

Thanks again to Sbvelleman..his tip helped solve a problem for which I did not have a good answer at the time.

 

[von]

I used one like the one in Post # 5. I added a water pump inlet / outlet nipple in each end of the valve (McMaster has these valves with female NPT pipe threads in each end). I installed the shut off in the heater hose just inside the engine compartment, just beyond the firewall. It is more or less "hidden" under the POA valve (Factory A/C car), down near the hood hinge and provides a nice neat, clean install. The one I used has a small "thumb lever" for the shut off as opposed to a screw that is turned with a screwdriver to turn off the water.

Thanks again to Sbvelleman..his tip helped solve a problem for which I did not have a good answer at the time.

Do you have a PN by chance? What is the NPT size?

 

[O'Man]

Do you have a PN by chance? What is the NPT size?

The thread is 1/2 NPT ...same size as the nipples that go into our water pumps. Cannot recall the P/N...go to McMaster Carr web site. I think the website is referenced in the earlier thread.

If you pump the part number that was given in the first Thread into the McMaster search box you will get to the section of the online catalog that has the valves. There is a large selection.

 

[von]

Thanks. Found them. FYI there is a screwdriver style shut-off that's female/female pipe threads. PN 4912K54. I think I'm going to get the T handle style, PN 4912K79.