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Legendary Driver
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You stated the problem was not present until the T-Stat was replaced, is this correct?
No he stated the problem became present when he PULLED the T-stat OUT!. The OP needs to clarify if he even has a T-stat in the system. The heater won't work if the t-stat isn't in there.
 

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Legendary Driver
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defrost makes the AC fan come on

yeah the stat has to restrict flow or there isn't the pressure drop to get coolent to the heater.

you could also clamp the lower rad hose and see if it gets warmer too
The stat is there to keep coolant in the rad longer so it has time to cool off so that engine temp can be regulated.
 
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