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Old 11-16-2002, 05:29 PM
The Warden's Avatar
Certified diesel nut
 
Join Date: Mar 2002
Location: Pacifica (SF Bay Area), CA
Posts: 2,946
Question Heater on drugs

I'm sure this question has been asked countless times in the past. However, here I get to ask it again.

The heater on my 300D works very erratically. I assume the heater core's okay; haven't noticed any coolant leaks. However, I have noticed that the heater doesn't work very well. Even in full DEFROST mode, the air actually only blows out hot slightly less than 50% of the time. The rest of the time, it feels like the air's not being heated or cooled at all. Even when the air feels like the heater's warming it up, I don't think the inside temp ever gets anywhere near the temp set on the wheel. Also, on EC mode, every window fogs up real quick and it starts feeling humid in the car.

What should I be looking at? The a/c works pretty happily so I would guess the push-button unit's okay...

Thanks in advance!
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2001 VW Jetta TDI, 5 speed, daily driver
1991 Ford F-350, work in progress
1984 Ford F-250 4x4, 6.9l turbo diesel, 5 speed manual
Previous oilburners: 1980 IH Scout, 1984 E-350, 1985 M-B 300D, 1979 M-B 300SD, 1983 M-B 300D
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