Just wanted to share some info about this;

I had a AMM failure (Air Mass Meter) when I bought my 960 last fall.
Got the tip from you guys that it could be due to a bad thermostat in the air box housing that controls the flow of warm/cold air to the engine.

Well, the volvo part (9142616) (it is not listed in volvos tech cataloges, good to know if you want to buy one) is placed just below the air filter.

I took some pictures to compare the new and old one;

This first picture is when the thermostat is cold (around 0 celcius).
It puts out its rod 7-8mm.



When warm, it only goes out to 11-12mm. Not a huge difference.


As comparison, New vs. Old. Both cold. Quite a difference.



When I was informed about the problem I disconnected the hot air duct from the exhaust, until I had the new replacement. Just to be sure. AMMs ain't cheap.
After replacement the engine feels more powerful, even after long runs.

So, check it out. It costs maybe 20$ and can save you the trouble of buying a new AMM for lots of $$$.

Just a thought..

I've been living without the thermostat and housing for 2 years now on the 960. There is no reason the thermostat should be there.



I keep the old thermostat housing in the garage for smog ckeck time.

I took the advice from some other posts to remove the thermostat, disconnect the hot air duct, and keep the outside-air position open. I don't really feel any difference in fuel consumption or performance, but my AMM should last a long time.
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'96 960 89K

I was the original poster for the part number for which I have to give credit to Dean, the top notch parts guy at Stutz Volvo in Salem MA. Thanks for the additional diagnostic information.
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'96 965, 16' wheels, rear 18mm bar & Koni + 204HP cams at 123K. Had '85 745 Turbo Diesel for 200K.

I don't own a 960 but two of my cars have/had the thermostats. This is excellent information. Thank you.

Bean
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'80 242GT 93k, '94 945T 143k, '89 765T 68k (new '94 B230FT)