Dual stage Thermostat

[Mazda_Powered]

So just helped my dad with a thermostat swap on his 89 B2600i and it turns out Mazda use to install dual stage units.

There's the larger port and a smaller port, with the markings 85/88*C

They're supposed to be great for engines with iron blocks and aluminium heads, less thermo shock from what i've been reading.

Anyone ever try to use one? there's still an active part number of 8AK1151719U for the thermostat.

Pics borrowed from mx6.com

[me109]

This is the original BP thermostat as well. Mazda dealer still has them available.

[Kitty]

I purchased one as NOS a while ago and installed it on the current BP in the bg. The car ran warmer with it installed compared to the autoparts stores stats. When I was doing my winter rad flush/refill I replaced it with a generic one and temps went back to normal.

[tireboy]

same for the b6. got it from kamloops mazda. it was like 27bucks .havent noticed a big difference in heat tho..

[Mazda_Powered]

I was just going to run a single stage 180* thermostat in my bpt, but i figured this was a neat find lol, never removed a dually from a car before.

would anyone recommend the dual stage over a single stage since they're OEM unlike the single stage???

[92dx]

breakdown on its purpose.

screenshot is from the 4wd protege fsm, the US fsm doesnt have this picture and graph, but the opening temps are the same. $25 from the dealer.

[Mazda_Powered]

oh cool! thanks for posting that

[protegemartin]

Thanks for posting! Been looking for one to replace the one in my car, 10 years and still going on mine! Was going to replace it till I saw it was a dual, so I put it back in with a new gasket.
I'd say better quality than aftermarket. Never had an aftermarket stat last like this one!

[Mazda_Powered]

awesome! thanks for the review!

[tireboy]

thanks for posting the info 92dx... good to know.

[monoxidechild]

all my mazda f2's and f2t's also use them stock. sad thing is every parts store sells a basic single stage as a replacement. and it doesnt work correctly in a system that is designed around the dual stage thermostat. so you either get it from mazda, or its wrong. lol

[Mazda_Powered]

yea i haven't purchased a thermostat for my BPT setup, so i'm probably going to get a dually

[89bfb6]

my local pars store carries a dully i have it installed on my car my temp gauge only goes up like 1/8 of the way up. oh well though better than overhating

[Skuce]

Cool bit of info there!

[DeeAOne]

i did not know this. good find.