Heater Control Valve
11-05-2012, 10:35 AM
#1
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Model: Cherokee
Heater Control Valve
I see where a lot people do away with the heater valve, run the hoses straight to the heater core and plug the vacuum line. Doesnt that make the heater on all the time? (hot coolant running through the core all the time) Does it affect A/C operation? My heater valve is cracked, If I can do without and run it straight it would be simple. 95 XJ 4.0.
11-05-2012, 11:23 AM
#2
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Year: 1998 Sport
Model: Cherokee
Engine: 4.0
Nope.
The heat is controlled by the blend door. It doesn't affect the ac ops. It is a very simple job to do you can do it in 2 different ways. The first and recommended way is to just but some bulk hose and replace the entire hose. Or you can put in a barbed fitting and a couple of hose clamps.
The heat is controlled by the blend door. It doesn't affect the ac ops. It is a very simple job to do you can do it in 2 different ways. The first and recommended way is to just but some bulk hose and replace the entire hose. Or you can put in a barbed fitting and a couple of hose clamps.
11-05-2012, 01:56 PM
#3
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Year: 2015, 2012
Model: Grand Cherokee (WK2)
Engine: 3.6L
I put both of my Jeeps back factory when I had to replace mine.
It's not a big deal. Everything works as it should.
If it was better the other way, then they would have done it like that.
The people that eliminate the valve are the first ones to holler that their A/C won't blow cold when warmer weather hits, or that their defrost/defog doesn't work right when its colder.
It's not a big deal. Everything works as it should.
If it was better the other way, then they would have done it like that.
The people that eliminate the valve are the first ones to holler that their A/C won't blow cold when warmer weather hits, or that their defrost/defog doesn't work right when its colder.
11-05-2012, 02:01 PM
#4
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Year: 1998 Sport
Model: Cherokee
Engine: 4.0
I put both of my Jeeps back factory when I had to replace mine.
It's not a big deal. Everything works as it should.
If it was better the other way, then they would have done it like that.
The people that eliminate the valve are the first ones to holler that their A/C won't blow cold when warmer weather hits, or that their defrost/defog doesn't work right when its colder.
It's not a big deal. Everything works as it should.
If it was better the other way, then they would have done it like that.
The people that eliminate the valve are the first ones to holler that their A/C won't blow cold when warmer weather hits, or that their defrost/defog doesn't work right when its colder.
11-05-2012, 02:17 PM
#6
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Model: Cherokee
My '96 has one. The AC runs a couple degrees colder with it in place, which I why I replaced it. Might be an insignificant difference if your A/C is working 100%. Mine is showing it's age, lol. It's a $10 part.
11-05-2012, 02:24 PM
#7
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Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
Yes it was removed due to failure rate and it kinda explodes coolant everywhere. Late model XJs just rely on the blend door. The A/C core, however, is always inline. (not sure what that part of the AC is called). Radiant heat and a bad seal will cause your AC to be less effective
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11-05-2012, 02:29 PM
#8
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Year: 1991
Model: Cherokee(XJ)
Engine: 4.0
I removed the valve in mine since the cheap china junk started leaking. Since i removed it i always have hot air blowing out the vents if the fan is on. Before i could get nice cool outside air on the vent setting and heat when set to heat, the ac is removed and never worked. Im sure i have other problems in the hvac system but i will be putting the valve back in
11-05-2012, 02:39 PM
#9
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Year: 1998 Sport
Model: Cherokee
Engine: 4.0
If you have heat coming in either you blend door isn't closing all the way or the seals are bad on the blend door. Personally I have never had heat coming in after removing the valve. But that is just my experiences with them.
11-05-2012, 02:40 PM
#10
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Year: 1994
Model: Cherokee
Engine: 4.0
i replaced mine and found that my original issue was actually due to leaky vacuum line that terminates into firewall. if i moved to florida, I'd get rid of the whole mess!
11-05-2012, 03:31 PM
#11
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Year: 1993
Model: Cherokee
Engine: I6
I removed mine. It snapped apart moving the heater hoses so I could get to the spark plug. I got a whole hose on there. As a temporary fix I shoved pvc pipe in there
02-03-2013, 04:00 PM
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Year: 1995
Model: Cherokee
Engine: 4.0L
Sorry to dig up an old-ish thread...didn't want to start a new one when we could just add more info to an old one!
I have a '95 and I DO have a heater control valve. It is leaking... pretty good too. About a drip every second... no wonder my coolant keeps disappearing.
Could this be why my heat and a/c are not very stong? I feel like my a/c especially used to be much stronger.
Help!
I have a '95 and I DO have a heater control valve. It is leaking... pretty good too. About a drip every second... no wonder my coolant keeps disappearing.
Could this be why my heat and a/c are not very stong? I feel like my a/c especially used to be much stronger.
Help!