Heat in cabin except when plugging in A/C evaporator

PhillipA

PhillipA

Member
Joined
Aug 18, 2020
Messages
73
Location
Hickory, NC
If I unplug the A/C evaporater I get 130 to 135 degree heat in the cabin on defrost. If I plug the A/C evaporator back in, the temp drops to 100.
 
The AC compressor is active when the defrost mode is selected but should not run when floor or dash vents are selected. The compressor is active when any mode with the "snowflake" symbol is used.
 
I agree but if I plug ac evaporater up and run defrost on high heat temp drops to 100 out of defrost vent because evaporater lines get ice cold beside heater core hoses and somehow cool heater core hoses off I guess.
 
PhillipA said:
I agree but if I plug ac evaporater up and run defrost on high heat temp drops to 100 out of defrost vent because evaporater lines get ice cold beside heater core hoses and somehow cool heater core hoses off I guess.
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How is the heat in the floor or dash mode, should blow you out of the cab.
 
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