vs
Thermostat OEM Mazda or Motorcraft
Reviews
I had the same issue, in the end, the thermostat was faulty, and the dealership replaced it for free. I didn’t have any warning light on the dashboard either.
Pros: replaced for free
Cons: thermostat was faulty
I had the same issue on my 09 Mazda 2.3L. Everything looked good on the dash, but the thermostat let too much coolant through, over cooling the engine. My CEL came on, I reset it, and it reappeared. Long drives on the freeway in cool weather was the scenario that triggered it, as the radiator is very effective at speed, and the engine isn't working hard cruising on level ground at freeway speeds. I bought the thermostat "cover" (it's the plastic assembly with the thermostat integrated in it-- PN LF70-15-170) for $57 from Amazon and installed it last November and the CEL has not reappeared.
Pros: CEL disappeared, engine cooling fixed
Part number: LF70-15-170
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 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
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
My 2021 Mazda3 Turbo has classic thermostat failure symptoms: \n\n- Erratic warm-up (sometimes stuck cold, sometimes near overheating). \n- Upper radiator hose stays lukewarm even after 20+ mins of driving (revved to 3K RPM to test). \n- Housing burns hot, but hose never gets scalding\u2014clear sign of a stuck thermostat.
Pros: erratic warm-up, stuck thermostat
Cons: sometimes near overheating
Vehicle:
Mazda
Part number: PX4J-15-170
That's due to their faulty thermostat for which they don't want to assume responsibility and call it what it is - a recall.
Cons: faulty thermostat
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
Our 2022 CX-5 Premium Plus (non turbo) is going in for its 3rd thermostat replacement next week. Each time it’s been replaced at Mazda under warranty with an OEM part. Vehicle will hit 90,000 Miles this month. Does this thermostat wear seem excessive or is it normal for these? Bought brand new and it’s been the only problem, other then general maintenance
Cons: repeated failures, excessive wear
Vehicle:
Mazda
Mileage: 144841 km
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