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Re: Wimpy Heater/4000q

Sounds like you have a serious cooling system problem! I've never found 
adequate heat to be a problem even at -20 F in the Ur-q, though adequate heat 
at -20 F can be a problem in the 4KQ. Perhaps you have some type of obstruction 
or the "new" thermostat is bad. I run a 160 F thermostat and an appropriate 
radiator fan switch in the Ur-Q and the heat is still excellent. You might want 
to check that little control valve in the heater-core supply line, if the cable 
is out of adjustment your flow through the core would certainly be reduced.