My story starts with a bad AMM....second one in 2 years on my 93 940 turbo wagon.....parts guys sold me a air preheat thermostat along with the rebuild AMM...told me that if I didn't buy it, it would void the warranty....well...I can't find the thing on my air box...so did they install one in the 940s?....Thanks
Should be inside the airbox, it operates a flapper on the air input to that metal hose over to the exhaust manifold. In a mild climate you can just remove that hose and no longer risk killing expensive AMMs, the preheat system is worthless, especially on a turbo where you cool the air right back down again with the intercooler.
Turbos don't have the hot air system after the 1989 model year, so they sold you a part your car never had.
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