I had a brand new mahle one with the connector wired in reverse for constant. Kept blowing a fuse. Returned it for a replacement and worked fine.
Pros: worked fine after replacement
Cons: connector wired in reverse
Reviews of Mahle thermostat
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68 votes
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I’ve installed Borg Wagner thermostats and those always failed until I installed a Mahle one which never failed. For some reason any other brand will get stuck open and the engine will never get up to temp.
Pros: Mahle never failed
Cons: Borg Wagner always failed
I used Mahle, but I got lucky I got the German-made one (afaik now most are made in Italy). It was NOS so I expect the electrical heater (to open early) to be defect. It's been 3 years without issue though.
Pros: three years without issue
Cons: heater may be defect
I used oem bmw coolant and a mahle thermostat.
Pros: oem coolant
Vehicle:
BMW
Mileage: 3000 km
Mahle is an OEM supplier and is on stock in Amazon.
Pros: OEM supplier, in stock
Mahle is an OE supplier for bmw, go for it
Pros: OE supplier
Vehicle:
BMW
Thermostat and temp sensor were just replaced with OE Mahle/Behr. P0128 showed up after car didn’t get up to temp. Heat is slightly affected until reaches operating temp.
Cons: car didn’t get up to temp
Vehicle:
BMW
Hatte auch schon ein Mahle Thermostat das kurz nach eimbau defekt war. Dannach ein Originales von BMW rein und seit dem wi3der keine Probleme.
Cons: kurz nach eimbau defekt
Mahle is the OE replacement for the thermostat, the Chrysler logo is on the part but sanded down. Autozone sells them with PT# TI23695 I just replaced mine last weekend.
Pros: OE replacement, Chrysler logo
Vehicle:
Jeep Grand Cherokee
Part number: TI23695
I’ve been using Germany-made Mahle thermostat for years. Now it throws a code that the heater doesn’t work (so it won’t open electrically, but mechanically it is working just fine), but no leaks.
Pros: mechanically working, no leaks
Cons: throws heater code
Vehicle:
BMW
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What we know about Mahle thermostat
The brand is registered in Germany. Official website: http://www.mahle.com/.
In March 2026, PartReview users have a mixed opinion of Mahle thermostat.
PR Score — 54 out of 100, based on 21 review and 68 votes. 9 positive reviews, 5 neutral reviews, 7 negative reviews. Average rating — 3.1 (out of 5). Vote balance: 37 up, 31 down.
In the ranking of the best thermostat this part is at position 12, behind OEM Mazda and Duralast , but ahead of Wahler and MISHIMOTO.
Users also evaluated the qualities of Mahle thermostat:
- Slow warm-up - engine takes a long time to reach normal temperature - rated negatively. 2.2 points out of 5.
- Overheating - temperature gauge rises quickly or fluctuates - rated ambivalently. 3.3 points out of 5.
- Cabin heat - heater blows weakly or becomes too hot at the wrong time - rated negatively. 1.5 point out of 5.
Thermostat Mahle in car-specific ratings
See which car brands and models owners choose Mahle thermostat for. Below are car-specific ratings where this part is in the Top-3:
- Mahle ranked #1 in thermostat ratings for: Jeep Grand Cherokee .
- Mahle ranked #2 for: Volkswagen Phaeton .
Thermostat Mahle in comparisons
There are 14 comparisons of Mahle thermostat with other manufacturers on PartReview.
In particular, see which thermostat are better: Mahle or Motorcraft, Mahle or OEM Honda, OEM Audi or Mahle, MOPAR or Mahle, Mahle or AISIN .