I cant find the heat control valve on 1999 jeep cherokee limited V-8 is it at the end before the firewall at the other end. I disconnected something that sort of resembled it by the master cylinder and it go warm for a minute but went right back to cold. Please help. Still freezing...
Your control valve is in the dash assembly, passenger side. buried. its not in the engine compartment. im having the same problem with mine...i am thinking its more like the climate control is screwed up.
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Check to see if the heater core hoses going into the firewall are hot when the engine radiator hoses are hot. If one heater core hose is hot and other is cool, then the heater core is blocked/plugged. If they are both cold then the hoses are blocked. Trace them both back to the engine and make sure there is no on/off valve on the intake to turn on. Some of those valves are vacuum operated or electrical. Just depends. For a quick fix. You can remove that valve and install a screw in fitting to the intake manifold that has a barb on the end to slip a hose over. But the heat will always be on hot.
Might be the heater control valve. Follow the heater hose from the engine, and as you get closer to the firewall, you should run into it. It is in line with the hose, and should have a vacuum hose connected to it.
Try checking the heater control valve. Follow the heater hose from the engine, and as you get closer to the firewall, you should run into it. It is in line with the hose, and should have a vacuum hose connected to it. Apply vacuum to the valve and it should move. If not, then replace the valve. If there is no vacuum when engine running and heater turned on, then check the hose for leaks or the vacuum source.
The valve would be connected in line in the heater hose going to the firewall often it will have a lever attached to it with a cable, can also be vacuum operated, look for a vacuum hose, if it has one. Most likely the heater core is plugged.
It sounds like the heater coil needs flushing out or replacing or the heater valve. Look on the engine firewall and make sure the heater valve is opening. If not open it manually and check the heat level. If that produced heat check the condition of the heater vale cable (or vaccum hose).
I don't know on the Grand, but our Cherokee has a water valve right by the firewall on the heater hose to control the heat. Not actually a fuse as it is heated by the coolant running from the engine, but apparently there was an issue with some s*&t heating systems. What is the actual problem you are having? as this 'fuse' may actually not exist.You may need to simply flush your radiator, replace the coolant after checking near the firewall for the valve that lets the hot water flow through, This may be the problem?
Under the hood on the pass. side firewall are two heater hose lines.
Start the car and let it get at normal operating temp. One of the hoses
is the "in" to the heater core, if you touch it it should be hot. The
other hose is the "out" of the heater core, this hose should be warm
and not really hot like the "in" hose. If the hose going in is hot and
the other cold, then your heater core is clogged. There is a valve
connected inline with one of the heater hoses, this is the heater
If the valve does not open, you will not have any heat either.
Go to engine compartment, locate heater control valve. It will have the heater hoses connected to it that pass into the firewall. Unhook actuation plunger on the control valve. This will allow the coolant to flow though the heater core at all times. Now you have heat. If you get too hot, you can control it by the hot/cold settings to adjust the heater door.