burr269

normal temp unless driving then its a little below 210 anti-freeze full, new thermostat, all hoses same temp any ideas please help since its zero dergrees here thanks!

burr269

heater core has been flushed

fishtaconc

Not unheard of to need multiple flushes, also check for broken/leaking vacuum lines that run to the "jeep egg" on the front bumper.

maddogs1965

Make sure the vacuum line is hooked up to the valve that opens and closes under the hood that controls the water going into your heater core. Have somebody switch your heater controls from cold to hot while you watch the valve to make sure the rod is opening and closing.

You can also grab the heater core lines going into and coming out of the heater core, if the heater core is plugged up, the inlet hose will most likely be hot, and the return hose will be luke warm......

fishtaconc

97+ doesn't have heater control valve.

C_libXJ2000

Im runing at 210 on the temp gauge thats normal for an xj no need to worry.... What yr is your rig?

greengoblin

have you had the heater core back flushed? my 97 had no heat till i back flushed it. some nasty black crap came out and now it cooks me.

Mattio

maybe see if the cable attached to the control **** is attached or broke. I have to reach under and "assist" my cable along with the **** to control temp. cable is visible under the dash on the passenger side. coming from center... cant miss it.

maddogs1965

What controls the heat when you turn the heat up and down inside the cab, is it climate control on the 97?

fishtaconc

The blend door closes over the heater core. The HCV was a back up planto the blend door, to stop water from flowing through Heater Core. Said door is controled by vacuum. Most people delete the HCV when it breaks.

maddogs1965

What does the 97 use for a control valve? Is it climate control like my Dads 2000 Grand Cherokee?

That was a major PAIN IN THE A$$ to change out the hot/cold air flapper when it broke on the passengers side, it cant blow hot air when the flap brakes, it has to brake on the COLD side..... had to gut the entire dash to get to the air box, then split the air box in half for a 20 dollar updated flap

fishtaconc

There is not a heater control valve, its a flapper controlled by vacuum. In the XJ it defaults closed (no heat), coolant flows through the heater core all the time.

Firestorm500

Flapper/blend door is not working.

burr269

Hot and cold controlled by cable vent select by vacuum when I turn the temp setting it turns hard or gets stuck

steven72192

my 98 cheorkee sport has the same problem, the water pump, thermostat, new coolant, and i flushed the heater core twice from both sides alot of crap came out but i still have no heat, it warms up to just under 210 and still nothing, any other suggestions?