Question about 2005 Mercury Grand Marquis
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Posted on Jan 02, 2017
it is down under the intake manifold. the intake manifold must be removed to get to it. this vehicle is known for developing a vacum leak in the elbow hose that connects to pcv valve, so ive done a few.
Posted on Feb 19, 2009
Most heater control valves are on or near the firewall behind the engine. Look for coolant hoses attached to a small metal piece. It also will have an arm that has a cable from inside the vehicle attached to it.
Posted on Oct 19, 2009
replace the knob, this doesnt have some valve you can just change to make it switch,this is a blend door with electrical actuator that moves the door from hot to cold air and also turns on or off ac depending on if that has a separte switch else where on control,you would have to remove the actuator and move the door and then some how jam the door so it doesnt move, i think its easier to replace the knob or use plier to twist the shaft of the control where the knob did.
Posted on Apr 21, 2010
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