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I stuck a wireless household thermometer in the airbox of our 95 960 152,820 miles today. The outside temp was 70F and the temp in the airbox steadily rose while we were driving around. We live up a rural road that has a fairly constant 4 percent grade for 4.5 miles. Halfway up the road the thermometer registered 160F before it litterally melted down (you should see it) and stopped transmitting it's signal.
I pulled the air mixing box, and jammed the air door to open/cool air. I put the badly deformed (but still operable) remote thermometer back in the airbox and took it up the same grade. The temperature was going down (73.5F) in the airbox even though I was climbing a 4% grade for 4.5 miles. This makes sense since there is plenty of air coming into the airbox. Interestingly, going downhill, the airbox temp. gained a few degrees. This makes sense as well since there is little airflow coming thru the box with the throttle closed and the airbox was picking up engine compartment heat.
It's amazing the engine can even run at those intake temperatures. There was a noticeable incease in engine spunk after blocking the hot air intake. A difference of at least 80+ degrees of cooling. I realy don't know how hot it got in there due to the meltdown of the thermometer and it exceeding it's operating range of 160F.
This will be fine for the summer but what about winter when it's -15F outside and I'm driving down the freeway at 75 mph. Oh well, I guess I'll cross that bridge when I get to it.
CHECK YOU AIRBOX THERMOSTAT!!!
DEWFPO
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1998 S90 068,300 and 1995 964 152,300
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