Somethings not right!

[Frank Messina]

Your thermostat is stuck, Go to your Ford dealer and get a 192° Motorcraft thermostat. Your engine will thank you. Modern engines with aluminum heads need more heat for best thermal efficiency. Old habits have us overcooling our engines. You'll be surprised how much better your engine will run. Some time back I tested several brands of thermostats and the Motorcraft were the only ones that opened at the stated temp.
Frank

[bingo2]

Originally Posted by Frank Messina

Some time back I tested several brands of thermostats and the Motorcraft were the only ones that opened at the stated temp.
Frank

I wanted to remove the 160 thermo that came in the car when I purchased it and bought a Mr. Gasket (MotorRad) 180. I tested it last night and it opened at 192.6 according to my digital thermometer. I think I'll take a trip to the Ford dealer today.

[kitcarbp]

Ditto what Frank said. You would be amazed at the poor quality of aftermarket t-stats. Many if not most Motorcraft t-stats use stainless steel in their construction from my experience. One I had for V6 in a '90 Super Coupe even had a nice little stainless check-ball valve to allow air to bleed through when refilling the system. Smart design. The 192F rating is/was typical of a fuel injected alum head motor since I cant remember when, 80's ??