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Thanks for the information and diagrams, I've determined that it is the heater core. I had it flushed professionally and it must be partially plugged and had an air pocket or something in it. I hooked a garden hose up to it and water flows cleanly, after I did that I have more heat, something...

Anybody know where the heater control valve is located on this vehicle? 97 jeep grand cherokee laredo 4.0 v6 4x4, is there a vacuum line somewhere to the heater core to shut the flow of water off to it? I need to check that before I cut a hole in the dash, but I cannot locate it. Any body got...

Thanks for the information I will try that and see what I find and post back soon.

Its a single heat control. So you think the heater treater fix will be my next bet? Not sure about auto or manual control, what's the difference? There are 3 controls, fan, location, and temperature (circular dials) the temperature control adjusts the actuator motor just above the hump under...

Hi all, I have read a ton of posts on this issue and checked into everything. I cannot figure out my problem. Replaced radiator, water pump, 2 thermostats, heater hoses get hot, had it flushed professionally and they stuck a high pressure hose to the heater core and it flows good, checked...