Question about 1999 Jeep Grand Cherokee

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Where exactly on the heater hoses''

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...

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  • Richard Scordino May 11, 2010

    Is temperature gauge reading normally? I can't remember exactly where it is on that engine, but, if you follow either of the heater hoses from the firewall towards the engine, the first thing you will run into is the control valve if you have one. It may have several connections to other hoses, but it will always have a small vacuum hose attached. In general, they don't go bad too often, unless they are leaking.Check to make sure it is operating... remove the vac hose and see if the little arm that operates the valve moves Check if there is vacuum at the small hose (try with ac on and off) this should get you moving in the right direction. If all seems ok, make sure when the control is moved that the interior plenum door is moving (either vacuum or cable operated, under dash)

  • yadayada
    yadayada May 11, 2010

    Wjhy do you think there is a heater control valve? I don't think that is the problem.

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  • 25 Answers

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.

Posted on Dec 17, 2008

  • glosol Apr 17, 2009

    And to let everyone know...There is no valve on the heater hose to heater core that restricts coolant flow in any way. The heat is controlled by one of the infamously faulty air control flaps allowing more or less air across heater core as needed for reaching the right temps. On climate control units, there is a built in diagnostic code reader. To check codes:

    1. start jeep

    2. press a/c and recirculation buttons at same time

    3. turn drivers temp control rotary knob 1 or 2 clicks clockwise

    4. write down the codes that are shown and run a google search

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1 Answer

Heat not working


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.

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1 Answer

Heater not working, it turns on , but only blows minimal or no heat .


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.

Feb 16, 2011 | 1993 Jeep Grand Cherokee

1 Answer

Heater does not produce heat


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.

Feb 13, 2011 | 1998 Jeep Grand Cherokee

1 Answer

1999 cherokee heat question?


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.

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check the water control valve in the heater hose inline to the heater core

Mar 06, 2010 | 1999 Jeep Cherokee

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99 jeep cherokee problem w/ heat I replaced the blower motor, water pump,radiator, thermostat and flushed the coolent system. Still getting little heat. I'm thinking heater core or head gasket... Is there...


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).

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1 Answer

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The valve that controls the water through the heater is not operating fully or the heater core is getting blocked.There is 2 hoses that go through the firewall to the heater core.If you look at the heater valve whilst someone operates it from inside the car,and you look in the engine bay,make sure the valve is working.Put your hands on the hoses and you can feel the hot water going through.(or not)Use this as a starting point and you may work out what is wrong.Hope this helps

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2 Answers

I can n ot find my heater fuse 97 jeep cherokee


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?

Dec 31, 2008 | 1997 Jeep Grand Cherokee

1 Answer

1989 jeep yj no heat


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 control vavle.
If the valve does not open, you will not have any heat either.

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1 Answer

Heater wont blow heat but A/C works fine....


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.

Nov 21, 2008 | 1999 Jeep Grand Cherokee

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