We're is shut off valve on heater core - Cars & Trucks

You need the part, it is either a flow restrictor valve or a shut off valve. If the part is a restrictor then you can rupture the heater by leaving it out.

Keep looking - there isn't a shut-off valve for the heater core. Water flows through the all the time. The only time you get heat is when you set the controls for it and then cabin air is routed through the core. All other times it bypasses it. If you have a leaking heater core, in most cases you can remove the heater hoses at the firewall and using a hose adapter available at any hardware store with a couple clamps, you can make a bypass loop of the core until you can get it replaced. Of course you have no cabin heat until you repair or replace the core. It is not recommended to stub off the ends of the heater hoses because on some vehicles, that loop provides other cooling functions such as cylinder heads, etc. That is why looping it is the safer choice.

Number 12 is heater control valve. Number 11 is vacuum line, full vacuum and the valve will shut off coolant flow. I can't say the valve is the problem? Maybe the heater core needs to be flushed? When you say coolant doesn't flow, you mean through heater core?

I'd steer clear of this one. The starter problem could be anything, regardless of what he 'thinks'. It could be a starter, it could be wiring, it could be the ignition switch, or it could even be the relay (the cheapest and easiest to replace, which is why I suspect he 'thinks' it's the problem).
The heater core is your greater concern. There are no o-rings in the heater core itself. If the heater core is leaking it must be replaced. There is a heater shut off valve under the dash and there may be o-rings where that is plumbed in. The actuator for the heater shut off valve is reportedly prone to failure. In either case, heater core or shut off valve, it's a pain to get to, requiring dismantling or removing the dash, and will probably be quite expensive to replace unless you're really handy and mechanically inclined.

sounds like heater core is plugged take off hoses hook a water hose and see if you can push it free

there is a vacuum ran valve on your heater hoses goin in to your heater core on the fire wall, they tend to get stuck shut n dont open to let hot anti freeze in the heater core, so cold air right, qwik fix is find the valve on heater core inlet and wire tie it open so antifreeze circulates no matter what, this is known on ford explorers. pretty much same truck.

the inlet to your heater core is dead center of your firewall and 7 inches down. There will be two hoses. The inlet hose is on the right as your facing it. About 8 to 10 inches before the firewall as you follow the inlet hose back towards the engine, there is an inline valve with two wires attached to the top. This valve opens when heat is called for, and allows flow through the heater core. This valve is known for sticking shut. To check it, get the engine warm, turn on your heater, and feel the hose on bolth sides of the inline valve. If its hot on bolth sides you're valves ok. You can also check your flow through your heater core by feeling the outlet hose to the left of the inlet hose. If thats hot your heater core is most likely ok. I have the same car and have a problem with the heater not getting hot. My heater core checks out ok. I think the problem is with the blendor door not directing airflow through the heater core. GOOD TIMES!!!

I'm not sure if you heater control valve is vaccuum operated or if it cable operated. If it is vaccuum operated the valve could be bad or you have a vaccuum leak to the valve. If your valve is cable operated then you most likely have a clogged heater core. Please rate my answer.

A manual or automatic valve in the heater core hose used for opening or closing, providing coolant flow control to the heater core. did you mean that or the blower

Hi. the heater core is leaking. i would replace This damaged core asap. there is a shut-off valve you can use to heel the leak until you can repair this issue. the shut-off valve is located under the hood on the fire wall center area.