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  #1  
Old 06-08-2001, 09:58 PM
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Location: Accokeek, MD
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Can anyone tell me if there is a way to shut off the climate control on a 1987 300E?

The car is new to me and I don't know if it is operating correctly. It never seems to shut off except when I push the "0" button located at the right of the row of buttons. But after a few seconds the fan starts blowing again. Low, high and auto fan seem to work.

Is there a way I can simply turn it off, roll the windows down and open the sun roof without the unit trying to control the temperature?

Smiles.
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1993 190E 2.3
2000 Toyota 4x4 Tundra
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  #2  
Old 06-08-2001, 10:09 PM
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Earl: The "O" button is supposed to shut it off. Sounds like a bad "push button panel" to me.
Gilly
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  #3  
Old 06-08-2001, 10:14 PM
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Earl:
I think something is not working right. When I push the right-mopt "O" button, ecerything shuts off and stays off - fan, compressor, the works. Pushing the E button to the immediate left shuts off the compressor, but lets the blower fan circulate air. The center button with 1 black up arrow and a white down arrow is the normal operating position. The button to the left of that with 2 white arrows is for use when the interior starts to slightly fog up, and should be switched back to the center button after the interior is clear. The left most button is the major defog button, and pumps hot air out the defrost vents. If you have an owners manual, it goes in to greater depth about how the buttons control different vents under different conditions, and gets a little complex, but O is supposed to be everything Off.
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  #4  
Old 06-08-2001, 10:52 PM
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Thanks John and Gilly.

I had the push button unit out while replacing light bulbs, radio etc. and everything seems to be contained in a black plastic box (if I recall corectly). Can I take the box apart and clean up contacts or otherwise repair it?

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1993 190E 2.3
2000 Toyota 4x4 Tundra
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  #5  
Old 06-08-2001, 11:08 PM
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Hey, it's a free country, take it apart if you think it'll do any good. My opinion? Get a new one.
Gilly
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  #6  
Old 06-11-2001, 12:56 AM
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Well I removed it and opened it up and found nothing wrong with it.

However when hooking it back up again I noticed that it misbehaved when there was stress on the box. I placed it in the slot so there was no stress on it and it worked fine. Then when I was screwing the face plate over the assembly the off button began acting up again when the screws were tight. (Cover was on correctly)

I backed the screws off just a little and the unit works fine again.

The face plate screws, screw into the frame for the control unit and if too tight causes the unit to bind so that the off button does not function properly.

Another one for the Wisdom File!

Smiles.

[Edited by ejsharp on 06-11-2001 at 12:00 AM]
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1993 190E 2.3
2000 Toyota 4x4 Tundra
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  #7  
Old 06-11-2001, 07:28 AM
LarryBible
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It is not uncommon to fix these units by heating the solder joints. Occasionally there will be a cold solder joint present. If you are not experienced soldering circuit boards, you can do more harm than good though.

Good luck,
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  #8  
Old 06-11-2001, 11:53 AM
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Thanks Larry. I did not know that. Another one for the Wisdom File!

Smiles.

PS Do you heat the board with a soldering gun (each joint individually) or use another method?
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1993 190E 2.3
2000 Toyota 4x4 Tundra
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  #9  
Old 06-11-2001, 03:24 PM
LarryBible
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Heat each solder joint on the board one at a time. Don't use a high power iron, or you may lift a trace on the circuit board. 40Watts would be plenty. Heat each joint only enough to flow the solder against the trace and the component lead, then get the iron the heck off of it.

Good luck,
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  #10  
Old 06-11-2001, 07:17 PM
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Thanks for the explanation. I was considering taking my plumber's torch to it.

Smiles.
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1993 190E 2.3
2000 Toyota 4x4 Tundra
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