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Old 10-24-2007, 05:02 PM
Join Date: Apr 2007
Posts: 7
Default 85 300d overheating

My car recently is having overheating problems.

Car was driven on freeway when the temp needle started climbing. Before this the temp showed normal or sometimes very low.

I noticed during the overheating that the hot air is not coming out of the vents. But at times when the hot air does come out, the temp needle returns to normal. I can also hear a wirling/grinding sound from the dash in front of the driver when the hot air is turned on.

It seems like it's a clogged water hose? or some other device that's not working properly? Is it the mono-valve? Any insight is appreciated!

Car is a 1985 300d california edition. Thermostat changed a few months ago.
1985 Mercedes 300d, CA, 145k+ mi. Daily 50+ miles commuter running on WVO.
1985 Chevrolet suburban, diesel
1987 Mercedes 300sdl, 265k mi
1997 Jeep Wrangler Sport, 103k miles (sold)
1998 BMW 740il, 118k mi (for sale)
1999 Honda CBR900RR, 40k
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