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#1
11-28-2006, 07:08 PM
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unbearably obvious climate control question (1982 300sd)
hey all -
i have an embarrassingly obvious question. basically, if i had the owners manual that came with the car, i could answer this question. on the blower switch on the dash control, what does the bottom button do? there are two halves to the switch - the top is a white fan, the bottom is an outline of a fan. i just got this car, and am trying to sort through some of its issues (of which there arent many - a possible ball joint, slow sunroof, some bulbs burned out, and a possible electrical issue with the horn/defogger which are sometimes a little flaky). anyhow, i cant help but notice that, while the blower activates when i press the top button, the bottom half of the button doesnt seem to do anything. sometimes i hear some intermittent clicks after pressing it, and then nothing else. also, when the blower is on, the heat that comes through the vents is not particularly hot at all, even at peak driving temps (80 deg. or so). so a) what does that bottom half of the switch do? b) how hot should the heat be? and c) here is the car:  EDIT: heres another, possible non problem. before starting the car, when all the warning lights go on, i hear the buzz, but the glow plug light is usually delayed, and then tends to come on for only brief little flicker before going off. however, i dont seem to have any problems starting the car. is it possible that a sensor somewhere is just glitching, or can this be a symptom of something else? Last edited by its_snowing; 11-28-2006 at 07:15 PM. 
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#2
11-28-2006, 07:31 PM
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Quote:
The heat should be HOT when on maximum, just like any other car. The GP plug light failing to light normally may be an indication of one or more burnt out glow plugs, or it may just be a problem with the indicator (or the bulb). The first thing to do is check the resistance of all the glow plugs to determine if any have failed.
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#3
11-28-2006, 07:49 PM
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hmm. so, i suppose i have a problem, in that the low setting on the blower is not working, and also the fact that the hot air is more like kind of warm air... thats a problem too. as far as i know - or as i was told - the glow plugs were replaced just before i bought it, so im assuming theyre ok.
i wonder if the blower problem could just be the switch? although, the fact that i just hear intermittent switching noises when the button is pressed could mean something.
__________________
1982 300sd, 230,000 miles, svo/wvo conversion... yellow http://www.jaymoschella.com
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#4
11-28-2006, 08:05 PM
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oh wait, after further reading, im wondering if hot air doesnt only come through the floor vents, and not the dash vents. im sorry, i am still new to this.
__________________
1982 300sd, 230,000 miles, svo/wvo conversion... yellow http://www.jaymoschella.com
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#5
11-28-2006, 08:12 PM
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Quote:
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#6
12-04-2006, 09:57 PM
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The fan works, so it is not being "told" to come on at low speed. More than likely you have a cold solder condition in the climate control unit. that would entail removal and repair, a project, that although tedious, can be done. A rebuilt unit runs over $250, and you still have to remove and replace. Not to mention core cost. The monovale is a cheap and easy swap, just make sure you need a replacement. Remove the current one, and if the rubber part is still entact, it's fine. It is located on the firewall, remove two screws, right there it is. Do this with a cold engine, you'll save a trip to the burn unit. If you do not have hot heat, check the temp gauge to see if it pretty much stays around 80c when the heat is on. You may need a new thermostat, easy $20 fix. The slow sunroof is probaly due to - here's a high tech term - gunk. I have two MBZ that have the same affliction. I have purchased a kit to clean out the tube which houses the cable that powers the roof, that Hans built. Do-da, do-da. Anyway, this is a long, laborious, process. I am not looking forward to it, yet will attack albeit next season. To seperate the ball joint, you will need a fork available at your local auto parts store, usually, and upper body strength, not to mention a heavy hammer. I replaced an upper control arm, and tie rod, both of which came with ball joints attached, lucky for me. You will need to make sure you don't crush said joint when installing. Get back with me on that if neccessary. Check to see if you need front wheel bearing replacement, this can be a VERY expensive repair if a failure occurs at speed, I am putting my former mechanic's daughter through college as proof. The defrost is supposed to, I think, be high fan speed and full heat regardless of temp setting. The horn might be something as simple as a loose connection. Does it work at all? Sometimes? Weak? "Have fun in your garage"
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