Heater core shut off valve installed

[beamn7]

My 85 Silverado doesn't have a heater control valve either. Just a blend door in the hvac unit....
Alot of motorhomes and stepvans still use the manual / cable operated heater control valve....
CJLINKSTER, your truck was not equipped with A/C from the factory. As mentioned, you have a Sanden compressor and the evaporator is not outside the firewall in the split case as a factory unit would be. May have been added at the dealer level. Was not uncommon to have that done....

[WarBeard]

I just went Out to look at my 89 V2500 Suburban and i don't see one either. I installed the same Autozone valve on that one too 5 or 6 years ago.

GM cars Always seem to have more bells and whistles than the trucks. I had two Cadillac's A 77 and a 81. When you opened the hood on one of them bad boys. It was 100 miles of vacuum hoses and valves LOL. What a nightmare!

[tucsonjwt]

I just joined the manual heater valve shutoff brigade. I got the same valve from O'Reilly for $11.44 with AZ tax - actually it was "free" because I used store credit cards I got from previous purchases of on sale oil, etc. The brand they had was Murray, but it looks the same. It does seem to make the A/C run cooler in the 100 degree ambient temperature with 454 heat blowing off the engine. I will keep an eye on the temp gauge to see if it creeps up on me.

[WarBeard]

Welcome to the club!...Now I'm driving this truck every day since the heater is not on during the summer!

[Tucson38]

How about using a ball valve from a plumbing supply place? Home Depot has one with with male barbed fittings (shark bite). These types of valves have heat ratings of either 200, 250, or 300 degrees.

[TDS-MN]

How does this actually work? doesn't it create a 'dead-end' for the coolant flow? Granted that's probably low pressure (based on water pump flow) but still? Wouldn't a return or bypass be a better way to accomplish this end result? Just asking, as I would think that would not cost much more to loop the flow. . .

??

[WarBeard]

Originally Posted by Tucson38

How about using a ball valve from a plumbing supply place? Home Depot has one with with male barbed fittings (shark bite). These types of valves have heat ratings of either 200, 250, or 300 degrees.

I would just be more money to get the same result. I think the valve alone is like 10 bucks. and then you need to get the 2 barbed fittings.

[WarBeard]

Originally Posted by TDS-MN

How does this actually work? doesn't it create a 'dead-end' for the coolant flow? Granted that's probably low pressure (based on water pump flow) but still? Wouldn't a return or bypass be a better way to accomplish this end result? Just asking, as I would think that would not cost much more to loop the flow. . .

??

It does create a dead end. But it doesn't matter, it wont hurt anything, been doing it for years. Making a loop IMO would dump hot water from the engine directly into the "Cool" side of the radiator and make your temps go up. Plus you will need to install a 5/8 to 3/4 fitting since the line going back into the radiator is bigger.

Plus! When you want your heater back all I have to do is open my valve. If you made a loop you have to reroute your hoses again and add coolant.

Like I said, once a month or so when your under the hood just open the valve and let the water flow for a few minutes.

.

[ghettoluxury]

As stated before Honda uses this from the factory for their heat control. It is a ball valve that is operated by a cable and only turns off the inlet flow. I have owned many Honda cars and never had a problem with heater cores.