Table 1 shows one common unknown or other related problems of the 2000 Mercury Grand Marquis.
| Problem Category | Number of Problems |
|---|---|
| Unknown Or Other problems |
The blower fan of the heater & defroster failed to operate. Windshield frost on the outside and fog on the inside could not be removed thus making driving very hazardous. After several days the problem resolved itself but reoccurred every year or two. I researched the problem recently during the last failure (2/6/2011) and feel strongly that the intermittent failing part is the blower motor speed controller, part number xw1h-19e624-ab. Fortunately, the motor and blower will operate (for now) after I hit it a couple times with a hammer. Several web sites describe this part including photos. Removal and installation. If this item has not been recalled as a safety issue, I think it should be.