Plastic Thermostat Housing Cracked


pretty bad
Typical Repair Cost:
Average Mileage:
205,000 miles
Total Complaints:
2 complaints

Most Common Solutions:

  1. need new intake manifold (2 reports)
1998 Mercury Grand Marquis cooling system problems

cooling system problem

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1998 Mercury Grand Marquis Owner Comments

problem #2

Apr 092011

Grand Marquis LS 4.6L

  • Automatic transmission
  • 210,000 miles


Making this important engine part (intake manifold) out of plastic is beyond my comprehension. I'm wondering if I should ever consider purchasing another Ford product. I'm so unhappy with my former repair shop (Williamsburg Ford-Lincoln-Mercury) that I think I know the answer. They replaced a fuse with a circuit breaker for a charge of $125.00. The circuit breaker lasted about two miles, then failed. When I called them, they told me my "real" problem was likely a bad fuel pump, which they were willing to replace for $965.00. I declined, and had my Mercury towed home. I then wrote a complaint letter to the general manager, seeking assistance from them for my $125.00 bill. He never replied verbally or in writing to my complaint.

Hasta la vista to Williamsburg Ford!!! I wouldn't send my worst enemy there. Not that I have a liking for my worst enemy, but I dislike Williamsburg Ford even more and have no desire to send them any new clients.

- Richard H., Williamsburg, VA, US

problem #1

Mar 052007

(reported on)

Grand Marquis LS V8

  • Automatic transmission
  • 200,000 miles

The housing on the 1998 Mercury Marquis that holds the engine thermostat is part of the intake manifold and is made of plastic.

Does anyone know of anyone being compensated by Ford Motor Co. for this problem? I have a 2007 Grand Marquis and the thermostat housing is not part of the manifold and is made of metal.

- Robert W., Batson, TX, US

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