Yeah, sorry....the fan is working properly but the air coming out is not warm at all.
If you have the heater control valve under the hood near the core, check that to see if its operating. Thats a vac operated valve in the heater hose near the evaporator/heater core inlets. I am not positive if the LT has that or not. L98 does.
Next would be to feel the heater hoses to see if both were warm. That might tell you if the problem is a vent mix door inside, and if the water is circulating thru the system. And last, if you have elec a/c control, run the heat up to 90,. which overrides the temp sensors and goes to full heat thru the blend door.
One of these "test" should help point to the reason why...
In addition, after reading the other thread and noticing that your old coolant was really bad, there is the possibility that the heater core is partially plugged or the control valve. Make certain that the car has a thermostat also. Those temps seem too LOW for this time of year,. A normal motor would want to run closer to 210 and even higher at a stop lite. Cruising it should be somewhere over 200 at least. 185 is a good normal temp when the snow is 2 ft deep. These cars run hot. 230 in a hot humid climate is not unusual. I just spent lots of money on a radiator and other enhancements and mine is down to 200 cruising and I'm thrilled.
If its operating temp is as low as you say while moving, a missing thermostat might cause that,. No stat will also prevent the system from pushing water to the heater hoses. Its easier to just circulate thru the block and radiator where the big hoses are. it takes some resistance (thermostat) somewhere to make the coolant flow thru the smaller heater hoses.
