Heater control valve

[MjAllTheWay]

Jest a question mine is leaking and caused my jeep to over heat i have replaced it 2 times so i wan to know if this is a common problem and is there a better one i can get.

[DJM/78]

I used a 97+ HCV from NAPA , no problems ..

Buy the one made in the US , not china , its 4 dollars more .

[MjAllTheWay]

Sweet Thank you.

[NWPhotog]

Or simply eliminate it. All it does is allow the engine to heat up a little quicker.

[MjAllTheWay]

Or simply eliminate it. All it does is allow the engine to heat up a little quicker.

Can i jest do that?? What is the best way to go get the better one or jest put a pipe there??

[deziped]

I'd replace it, as without it (unless you block it off completly) you have heat going to the heater which disipates into the cab area during the Summer months even without the blower on. If you like it hot in the Summer you'll be just toasty. If you have A/C it'll be hot air coming out not cool.

[NWPhotog]

I'd replace it, as without it (unless you block it off completly) you have heat going to the heater which disipates into the cab area during the Summer months even without the blower on. If you like it hot in the Summer you'll be just toasty. If you have A/C it'll be hot air coming out not cool.

 

Actually I don't think that is true. All it does is close off when the engine is cold so the engine can get to operating temp quicker. The heater core temperature control is separate. Most of the State XJs out here have it eliminated and they run just fine. You just run heater tubing from the radiator/engine straight to the heater core. They are different sizes. 5/8" and 1/2" if I remember correctly?

[HOrnbrod]

I'd replace it, as without it (unless you block it off completly) you have heat going to the heater which disipates into the cab area during the Summer months even without the blower on. If you like it hot in the Summer you'll be just toasty. If you have A/C it'll be hot air coming out not cool.

 

Not true, for sure with the HO 91-92 models. I eliminated the hot water valve several years ago by using the newer XJ heater hoses on my 91, as Chryco did in 96? Forget the year. If your HVAC system is functioning correctly and the HVAC door seals are intact, no heater core hot air will enter the cab. No hot air enters the cab w. the blower off, only ambient air. No hot air enters the cab w. the A/C on, only A/C cold air.

[johnnyc]

I'd replace it, as without it (unless you block it off completly) you have heat going to the heater which disipates into the cab area during the Summer months even without the blower on. If you like it hot in the Summer you'll be just toasty. If you have A/C it'll be hot air coming out not cool.

 

Actually I don't think that is true. All it does is close off when the engine is cold so the engine can get to operating temp quicker. The heater core temperature control is separate. Most of the State XJs out here have it eliminated and they run just fine. You just run heater tubing from the radiator/engine straight to the heater core. They are different sizes. 5/8" and 1/2" if I remember correctly?

 

5/8" and 11/16". But you can use 5/8" on both. It's just a little tight on the 11/16" nipples.

[ParadiseMJ]

I'd replace it, as without it (unless you block it off completly) you have heat going to the heater which disipates into the cab area during the Summer months even without the blower on. If you like it hot in the Summer you'll be just toasty. If you have A/C it'll be hot air coming out not cool.

 

Not true, for sure with the HO 91-92 models. I eliminated the hot water valve several years ago by using the newer XJ heater hoses on my 91, as Chryco did in 96? Forget the year. If your HVAC system is functioning correctly and the HVAC door seals are intact, no heater core hot air will enter the cab. No hot air enters the cab w. the blower off, only ambient air. No hot air enters the cab w. the A/C on, only A/C cold air.

 

X2 - that's what I've found. When I converted my 90 XJ and the 88 MJ to open cooling I eliminated the valve. I have not noticed that there is any heat coming out my vents unless I want it to. I also believe that coolant flowing thru the core keeps the core from building up "crap". Keeps the whole system cleaner.

[MjAllTheWay]

I'd replace it, as without it (unless you block it off completly) you have heat going to the heater which disipates into the cab area during the Summer months even without the blower on. If you like it hot in the Summer you'll be just toasty. If you have A/C it'll be hot air coming out not cool.

 

Actually I don't think that is true. All it does is close off when the engine is cold so the engine can get to operating temp quicker. The heater core temperature control is separate. Most of the State XJs out here have it eliminated and they run just fine. You just run heater tubing from the radiator/engine straight to the heater core. They are different sizes. 5/8" and 1/2" if I remember correctly?

 

5/8" and 11/16". But you can use 5/8" on both. It's just a little tight on the 11/16" nipples.

 

So what do i use jest a peace of metal tube and put a bend in it