Little to no heat no change with temperature settings

Asked by GuruBK39S Jan 11, 2019 at 06:30 AM about the 1994 Mercury Grand Marquis LS Sedan RWD

Question type: Maintenance & Repair

It fluctuates some time hot sometimes cold have disconnected ac , no control
with temperature selector, need vacuum diagram to find blend door?

1 Answer
38,945

beatupchevy answered 5 years ago

make sure the coolant is topped off , if you can reach the hoses that run into the cabin see if they are both hot then you'll know if the heater core is plugged , remove them and flush it out , do you hear anything open/close when you make a selection ?

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