LACK OF HEAT

[mongo1063]

I HAVE A 96 SUB 5.7, W/FRONT & REAR HEAT & A/C, MANUAL CONTROLS NOT

ELECTRONIC, I'M NOT GETTING ENOUGH HEAT IN THE FRONT SYSTEM & NONE IN THE REAR, SOME TIMES I'LL GET FULL HEAT FROM FRONT SITTING AT IDLE WHILE WAITING FOR TRAFFIC LIGHT, I'VE CHANGED THERMOSTAT, BLED AIR FROM SYSTEM, CHANGED A/FREEZE, CHECKED VACUUM TO HEATER VALVE, HEATER VALVE WAS REPLACED DUE TO LEAK. WOULD LIKE TO CHECK FLAPS FOR PROPER MOVEMENT BEFORE CONDEMING HEATER CORE, CAN THE FLAPS BE RESYNC'D

 

ANY ADVICE WOULD BE A GREAT HELP

 

THANKS

[GM-Tech]

Heater core is probably restricted. IF you feel the inlet and outlet heater hoses on the core, are they equally hot with the heat on high speed?