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Spare parts reviews ➔ All comparisons ➔ Wahler ➔ AISIN

Thermostat Wahler or AISIN

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Wahler
AISIN
Wahler › Thermostat
BMWMikeM
Rating 5.0

In the past and up to several months ago, I’ve always gone with Saleri (Italy) pumps and Wahler (Germany) thermostats for the M54 and have had great results.

Pros: great results
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Wahler › Thermostat
CetiAlpha4
Rating 5.0

I got a Wahler thermostat once who was the OEM maker for MB, the only difference between the Wahler and the old MB one was that there was a spot where the MB logo was, on the Wahler one that logo was gone, looks like it was there, but someone with an angle grinder scratched out the MB logo so it probably came off the same line that made the MB part.

Pros: OEM quality, identical to original
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Wahler › Thermostat
_nvisible
  • Overheating:
Rating 5.0

I have had a car not bleed properly/ run hot (but not overheat) only when using the wrong thermostat. Replacing it with Wahler fixed the issue.

Pros: fixed bleeding issue
Vehicle: Porsche
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AISIN › Thermostat
bikeswoodkayakdad
  • Overheating:
  • Cabin heat:
Rating 3.0

New thermostat (Aisin brand), fresh oil, fresh coolant, replaced at that time. Coolant system bled well. No leaks. Heat worked flawlessly. AC worked after the swap. Overheated the drive home after that swap, turns out the radiator fan module got fried on the final drive (it was above 250 on coolant temps before replacing the engine, on a 30 minute, fast, highway drive). Ordered a new one. Everything working perfect now at the right temperature points. Engine times reading perfect too (watching live data). On a 30 minute highway drive tonight, returning home after the same drive 2 days ago with zero issues, it overheats again. Radiator fans are working. The one thing I changed during the drive was turning down the heat from HIGH to 75. No more than 10 minutes later I hear the bubbling in the heater core area. Take my exit from the highway, and the red temp light starts flashing, temps read 239, and the bubbling worsened. Temps stayed above 228 until I made it home from my exit. Worse at red lights. Turned off for 10 minutes, turned back on, temps went up to 232 at idle, holding steady. Lower radiator hose read 102 degrees, upper hose reads 190.

Pros: heat worked flawlessly, AC worked
Cons: overheated, bubbling in heater core
Vehicle: Subaru Outback
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Wahler › Thermostat
jimjoe21
  • Slow warm-up:
  • Cabin heat:
Rating 0.5

I decided to try another thermostat, this time a Wahler and nothing has changed as the car will still not get up to temperature and no hot air.

Cons: car not reaching temperature, no hot air
Vehicle: BMW
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Which thermostat to choose — Wahler or AISIN?

If choosing thermostat across many manufacturers, check the part ranking. If your choice is down to two brands, the PartReview part comparisons help.

We compare thermostat across these categories:

Comparison of thermostat Wahler and AISIN
  1. PR Score.
  2. Overall ranking.
  3. Vote balance.
  4. Average rating.
  5. Number of reviews.
  6. Feature ratings.
  7. Car owners’ choice.

Which thermostat are better — AISIN or Wahler?

In March 2026 on PartReview, thermostat AISIN were overall better than Wahler.

  1. Wahler received a PR Score of 48 out of 100, and AISIN scored 83 points.
  2. Wahler ranked 13 in the overall ranking, and AISIN ranked 5.
  3. The average rating is higher for AISIN (4.3) than for Wahler (2.9).
  4. Thermostat AISIN have better feature ratings than Wahler:
    • Slow warm-up - owners believe, that this property for AISIN is better than Wahler.
    • Cabin heat - drivers claim, that this property for AISIN is outperforms Wahler.
    • Overheating - reviews suggest, that this property for AISIN is preferred to Wahler.

Which thermostat are more popular — Wahler or AISIN?

Thermostat Wahler and AISIN were equally popular according to data in March 2026.

By vote balance, thermostat AISIN surpassed Wahler:

  • For Wahler, the ratio of positive (41) to negative (44) votes is -3 votes.
  • For AISIN, the ratio of positive (26) to negative (5) votes is 21 vote.

By number of reviews, thermostat Wahler surpassed AISIN:

Which thermostat do car owners prefer — Wahler or AISIN?

In March 2026, according to PartReview, thermostat Wahler and AISIN have not taken top places in car-specific ratings. You can help by adding your review about these manufacturers.

Other comparisons of thermostat

If this comparison didn’t fully answer your question, there are many others on PartReview.

For example, comparisons of thermostat Wahler with: MotoRad, OEM Volkswagen, Mahle, OEM Mazda, MOPAR, MISHIMOTO, Gates, OEM BMW, OEM Nissan, OEM Audi.

Also available: comparisons of thermostat AISIN with: MotoRad, OEM Volkswagen, Mahle, OEM Mazda, MOPAR, MISHIMOTO, Gates, OEM BMW, OEM Nissan, OEM Audi.

You can also see who is better among other thermostat manufacturers: Wahler or MotoRad, OEM Volkswagen or MotoRad, Mahle or MotoRad, OEM Mazda or MotoRad, MOPAR or MotoRad.

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