Question about 2001 Mercury Grand Marquis
Run self test on heater control head. With the key press off and floor buttons at the same time for 2seconds then release and press auto button for a second.this will put system into self test.if no code all the blend door actuators are ok and I would think vacuum leak from main vacuum, black line going through fire
Posted on Jun 12, 2014
SOURCE: Just got heater core replaced
It sounds like when they replaced your heater core, that they didn't properly hook up the blend door contros at the control panel. I would take it back to the repair shop that did the work and have them go back over things again just to make sure.
Posted on Dec 04, 2008
needs re-gassing because one line should be hot (feed) and the return cold , This is a specialist job do not attempt to do it yourself because its extremely dangerous with very high pressures involved
Posted on Jun 21, 2009
The hot/cold switch is probably bad.you have a blend door box that opens to let the cold air in and closes to let the hot air in.From what you are saying this part is no responding to the switch movement.Make sure power is at the switch and power should go through the switch when put on cold air this moves the blend door.Some times the blend door goes bad and has to be replaced its under the dash on the right side.
Posted on Aug 10, 2009
SOURCE: I can turn the ac
It sounds like thermostat (in coolant system) needs to be replaced. They only control you have for temps are the dials on dash, but if coolant thermostat is sticking you're limited to what it outputs. Replace coolant thermostat and you should be "good to go"
Posted on Feb 22, 2011
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