Hello,
The heater valve is what you are describing. It opens and closes as you move the slector from hot to cold. The feed to the heater core comes off the pipe from the water pump and goes into the bottom port. Just remember the rule, "heat rises". As far as your thermostat question, I believe you are talking about the engine thermostat? If so, yes, and your jeep calls for a 195 degree thermostat.
If I am missing something from your question, please let me know.
Scott.
actually what I was talking about is the two hoses coming out of the firewall/heater coil. I think the top hose rus into the heater valve or what I call the assembly through the bottom port and the 2nd hose underneath runs into the top of the heater valve/assembly I wanted to verify that was right? It must make a difference. those hoses are called bypass hoses I think? the thermostat I have bought is not 195. so i left it out concerned that the jeep was running hot aready and thank you .i have aready put hoeses on but wonder if it could be water port on block. might be stoped up because mostley when ac is on or defrost is on. the hose had a bad kink in it so could I possibly have fixed the problem? thank you
You have to remember that without a thermostat, the coolant constantly circulates. You are not giving it time to cool off in the radiator for the return trip back into the engine; furthermore, when the A/C is on, the condenser is getting hot and also heating up the radiator, so inseted of cooling the coolant, you are actually heating it up a tad more.
Now, if you had a kink in the heater hose, that should not have made a difference in engine temp, only heater out put. Install that thermostat and if the radiator cap looks old and crusty, change it also. A cap that will not hold pressure will also increase engine temp. Remember your high school physics. A liquid under pressure needs more heat to boil.
ASE Certified Technician
ASE Certified 0ver 25 years. Dealership, independant experience Bubmer to Bumper all makes/models