My brother's 190 has had a wierd heater for the past year, but I'm just now getting ready to look into it. When you use the defroster, the air will blow cold, but if you turn it off then back on in a couple minutes, it might blow hot like it should. Or, if it is blowing warm, it will just instantly go to cold until switched off, waiting awhile, then back on. And even that doesn't always do the trick. I was thinking maybe the heater valve that's vacuum controlled? Where is this valve located? Do you guys have any ideas as to how much vacuum I should be pulling there?

His car is the epitome of a vacuum system gone bad. Sometimes it won't shut of correctly, door locks just whine, center vents freeze you out if you leave them physically open in the winter. Hey, starts the best in the winter though! (my car has had 1 GP out since I've had it, so I don't know how well it could start yet.)

Thanks
David

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2000 Honda Accord V6 137k miles

1972 300SEL 4.5 98k miles

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I'm a fairly new owner of an '86 190D. I can't help much on the other issues, but from what I've read, the center dash vents only blow cold, or outside air. They aren't supposed to blow hot air under any conditions. I wish this weren't the case, as it would be nice to have warm air out of the center of the dash.

SteveM.

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'93 190E/D 2.5 Turbodiesel 5-speed (daily driver)
'87 190D 2.5 Turbo rustbucket - parts car
'84 Dodge Rampage diesel - Land Speed Record Holder
'13 Ram 2500 Diesel
'05 Toyota 4Runner

The vacuum pump could be quite weak at this point. I replaced my vacuum pump at 250kmi, and there was a vast improvement. I thought I had major vacuum problems, but it was the pump.

Finally, the center vents are ambient or AC -- not heater.

The defroster problem could be vac. pump related, or it may be compressor related (the compressor is supposed to kick in when you use the defrost button on the 190.

Btw, what is the vin number of his 190. My ends with 33179 and it was the 354th 2.2 D motor. After 16 years of driving it, I finally got a new car so my trusty 190 only gets driven a couple of times a month. I am getting ready to solve many of the body issues over then coming months.

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Jovan

'84 (11/83) 190D 2.2 5-Speed; Silver/Blue; Motor No. 00354, 402k mi (340+kmi mine)

'89 Porsche 911 Turbo Coupe; Black/Black; 53kmi
'05 BMW 530i 6-Speed; 302kmi
'19 Range Rover; 30kmi

Thank you for your responses, when I get a hand vacuum pump I guess I'll look into it further and check the pull form the pump. Regarding the vents, I'm aware that they only blow cold air, that stinks, I know.

Thanks
David

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2000 Honda Accord V6 137k miles

1972 300SEL 4.5 98k miles

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