Your thermostat is probably stuck open. Replace it with an OEM Motorcraft version, not aftermarket.
Pros: OEM Motorcraft version
Cons: not aftermarket
Reviews of Motorcraft thermostat
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31 votes
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I replaced the thermostat from a non-OEM to Motorcraft about a month ago, and the only difference has been the speed at which the dial moves from higher temps to its normal positon.
Pros: faster dial movement
Vehicle:
Ford Ranger
The Motorcraft thermostat sounds promising though, never have an issue with genuine ford parts.
Pros: no issues, reliable
Vehicle:
Jeep Cherokee
I used a motorcraft RT-1139 thermostat. Comes with a jiggle valve to help bleed air already installed and cost me 8 bucks. You won’t find any place that says they fit other than some forum posts but they do indeed work, I installed one on my MJ with the only issue being me not refilling the radiator after dumping all the coolant.
Pros: works well, jiggle valve, good value
Vehicle:
Jeep
Part number: RT-1139
I bought a Motorcraft thermostat from the Ford dealer for my Crown Vic and it ran about 20 degrees cold.
Cons: ran 20 degrees cold
Vehicle:
Ford Crown Victoria I
I requested they use only Motorcraft thermostat, because I knew there was a part # update. Threw the updated Motorcraft one in and it solved the issue.
Pros: solved issue, updated part
Vehicle:
Ford
Soon as i bought Motorcraft all was normal again
Pros: all was normal
Vehicle:
Ford
I’ve had a Motorcraft thermostat fail after 100mi on my Ford
Cons: failed quickly
Vehicle:
Ford
Mileage: 161 km
Make sure you use the motorcraft thermostat.
Pros: highly recommended
Go with the Motorcraft thermostat as it has a rubber seal on the outside edge.
Pros: has rubber seal
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What we know about Motorcraft thermostat
The brand is registered in USA. Official website: https://parts.ford.com/.
In March 2026, PartReview users have a mixed opinion of Motorcraft thermostat.
PR Score — 74 out of 100, based on 10 reviews and 31 vote. 7 positive reviews, 1 neutral review, 2 negative reviews. Average rating — 3.9 (out of 5). Vote balance: 23 up, 8 down.
In the ranking of the best thermostat this part is at position 8, behind OEM Audi and OEM Honda , but ahead of OEM BMW and Duralast.
Users also evaluated the qualities of Motorcraft thermostat:
- Slow warm-up - engine takes a long time to reach normal temperature - rated positively. 4 points out of 5.
- Overheating - temperature gauge rises quickly or fluctuates - rated positively. 3.5 points out of 5.
- Cabin heat - heater blows weakly or becomes too hot at the wrong time - rated positively. 4 points out of 5.
Thermostat Motorcraft in car-specific ratings
See which car brands and models owners choose Motorcraft thermostat for. Below are car-specific ratings where this part is in the Top-3:
- Motorcraft ranked #2 for: Jeep Cherokee .
Thermostat Motorcraft in comparisons
There are 14 comparisons of Motorcraft thermostat with other manufacturers on PartReview.
In particular, see which thermostat are better: Duralast or Motorcraft, AISIN or Motorcraft, MotoRad or Motorcraft, OEM Nissan or Motorcraft, OEM Mazda or Motorcraft .