1993 Mercury Grand Marquis Q&A

1993 Mercury Grand Marquis Question: My heater was hardly heating at all. I replaced thermastat. A little more heat,

but not much. Blower works fine. one hose gets hot, other one cold. -
Answer 1
CK FOR AIR IN SYSTEM ALSO CK HEATER CONTROL VALVE OPERATION -
Answer 2
maybe your heater core is clogged -