I'm wondering if the heater core flow valve might be my problem.
I seem to have little or no flow to the heater core at low RPM's. I start the Jeep for 10 minutes before leaving in the morning with the heater set to high and when I get in it's still blowing cold air. A few rev's of the engine and the air gets warm almost instantly, but if I let it idle for a bit, the air slowly returns to cold.
I see an electrical connection to the thermostat housing where the heater core hose comes off, is that where the valve is? I suppose it could be stuck or not opening fully and only the increased pressure from higher RPM's would allow the flow. ???? Anybody seen this before? I guess I'll rip into it this weekend.
[B]2001 TJ Sport - 4.0L/5-sp, locked Dana 44's, 4.10, 33's, Mile Marker; 2000 TJ Sport RIP