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11744 NE Ainsworth Circle
Portland, OR 97220
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503-257-7500
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Air Box Thermostat Valve FAILURE OF THIS PART IS THE NUMBER ONE REASON FOR AIR MASS SENSOR FAILURE
Many gas powered Volvos have a simple, thermostatically controlled shutter valve in the air filter box. Generally, the thermostatic valve will fail in the pre-heated air position. This routes super heated air to the air mass meter, resulting in an incorrect lean fuel mixture which can cause stalling, hesitation and in severe cases bucking at cruising speeds as if the fuel were momentarily shut off. Left unchecked, the air mass meter will soon fail (a very expensive part)! Check your system on a day when the temperature is above 60 degrees F ambient. The valve should be fully open, directing fresh air flow into the box (not from the pre-heat side). If it's not, then you should replace it. Also, if the valve fails to reach full extension at hot and cold extreme, replace it. Please check fitment listed below to ensure products will fit your specific vehicle. Some products may include or exclude some model years or engine and transmission combinations. The products listed on our website are for Volvos sold in the North American market. Many of the parts are exactly the same as those used in other markets, however we cannot guarantee fitment for those markets.
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1266826 Reviewed by Sern from Seattle, WA
The advice to replace this part is good and I wouldn't have thought about it or realized that it had such a big impact on the life span of the Air Mass Meter.
To install the part it is necessary, or certainly easiest, to remove the flapper valve assembly from the air filter box. You can leave the box itself in the car. There are three attachment points and the unit is freed up by squeezing the tabs together, which releases them from the box body.
With the flapper valve assembly out I put it in the vise, gently but firmly, and was able to compress the spring and plunger assembly towards the flapper valve, which is at the bottom of the box when installed in the car. This allows one to remove the old thermostat and slip the new one into the flapper valve assembly.
I was perplexed for a while by the addition of a small brass cap that was held on the thermostat shaft by a large rubber band, but it must have been there to protect the shaft end during shipping because it's too big in diameter to fit in the unit. The flapper seems to work fine without it. (It would have been helpful to have a note about this with the part.)
The installation was relatively easy and the effect on the operation of the engine from this thermostat and a new (rebuilt) Air Mass Meter was immediate. It runs as it should. I see that the Air Mass Meter has a three year warranty, which seems reasonable. I intend to try using the CRC cleaner I bought when I service the air filter.
March 2009
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