Have replaced throttle position sensor and still have low idle problem, what do I replace next?
SOURCE: heater and airconditioner control on mercery grand marquis
If the fan will not run on ANY speed in your Grand Marquis, the problem is most likely NOT the control switch.
Check for power and ground at the blower motor connector. If power and ground is present, replace the blower motor. Otherwise, the problem is most likely a failed blower speed control module (VERY common). The blower motor speed controller is located in the A/C evaporator housing just below the heater hoses.
Note: It is also common for a bad blower motor to CAUSE the controller to go bad. You MAY have to replace BOTH.
SOURCE: rear shocks on a 1996 Mercury Grand Marquis
2 bolts on the top of shocks and 1 bolt on the bottom but the top 2 bolts are a pain in the neck
SOURCE: Cost to replace and repair heater core in 99 Grand Marquis
about $1200 US, this requires the dash be pulled out, about 12 hours of labor.
SOURCE: 2001 mercury grand marquis. Engine stutters or
Start car and use a squirt bottle of water to wet the wires and coil, if you see it spark or run rough one or both are bad, repair the wires first as they are more common.
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