View Full Version : Heat control valve

December 14th, 2009, 03:49
I inherited my jeep. Apparently the heat control vale is busted so my brother in law rigged up a fix. I have no Idea what goes where. I will post a pic later. Dark outside right now.


1993 Jeep Cherokee Sport I6 RWD

December 14th, 2009, 03:52
Heater control valves are a very common failure on the 4.0 They are pretty inexpensive to replace or you can just eliminate them; later model XJs don't have them.

December 14th, 2009, 04:03
Is there a right up on eliminate the valve. Maybe a diy on a site. Tried google, lots of misleads.


December 14th, 2009, 05:24
It has been written up a few times. Keep searching. But IIRC, you can solder together a tee from plumbing parts.

December 14th, 2009, 05:27
It's really easy. All you need is some 5/8" heater hose, some hose clamps, something to cut the hoses, and something to cut the valve off of the (metal) tee.

I bought a used valve from the j/y ($6) and built the new assembly before removing the existing valve/tee.
Cut the valve off (be sure to file/clean the cut end) and measure/cut and attach new hose pieces to the 'new' tee. Measure by holding the bulk hose where you want it, and mark your cut. make sure to leave enough to go past the old valve and onto the tee.
Removed old heater valve and hoses.
Replace existing valve/tee with new assembly.
Measure twice, cut once, or buy enough hose to do it again.

Here's a good time/opportunity to back flush the heater core.

If you're even mildly mechanically inclined, then I wouldn't think you need much more write-up than that.

December 14th, 2009, 08:51


December 14th, 2009, 09:02
Bought the valve at autozone for 19 bucks. Putting on later this afternoon.