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  #1  
Old 01-27-2004, 06:41 PM
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Join Date: Mar 2003
Posts: 173
Fixed the "only have heat problem"

HI,
I just wanted to share my experience with you all and at the same time thank everyone for their input
THe vehicle is a 1983 TD wagon (123)
Poor heat control and discovered a ripped diaphram on the monovalve. Replaced and then I had great heat. Boy did I have HEAT!!!!
Could not regulate temp at all. The monovalve was never getting a Ground signal to close so It allowed full flow. I removed the pushbutton control unit and thanks to many members previous post I learned that when the unit is off, "O" pushed the monovalve should be energized. It wasn't.
I decided to go to my local friendly junkyard where I got my engine from and did some shopping. I pulled a pushbutton unit from a 85 CD and a Temp control box (silcver box behind glovebox) figuring it must be one or the other.
Well when I installed the pushbutton unit, that solved the problem. Everything works perfectly now. The temp wheel controls the inside temp perfectly.
I will add that before I installed the "new" CCU unit I took apart and cleaned the thumbwheel contacts. They were filthy. I have also replaced the foam tube that connects the dash temp sensor. Mine was as expected corroded and even broke in half.
I also notice now at nite that what ever button I have pushed in on the CCU, It lights up brighter to let you know what mode you are in. My old one never did.
I just wanted to share my results with everone and hopefully if someone else experiences the same thing, It will save them alot of diagnostic time.
THanks again to all contributors,
Mike Moran

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  #2  
Old 01-27-2004, 07:04 PM
1stimer's Avatar
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Join Date: Oct 2002
Location: Pasadena, CA
Posts: 556
Way to go! I have been avoiding my climate control issues for a while now. Mine is on "default" mode where I only get defrost, but the heat works great on that setting, so I have left it alone. I am going to look at a 1984 with a smashed drivers side that I can get for around 500 bucks. Hopefully, there will be some good parts on it.
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1984 300D---Sold
1995 E420 - 106K - Brilliant Silver Metallic/Orion Gray --- Sold
1984 300SD - 151K Manganese Brown Metallic/Mostly Black --- Sold
1982 240D - 79K - Manila Beige/Palomino---Sold
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  #3  
Old 01-27-2004, 09:40 PM
sfloriII's Avatar
Still pedaling...
 
Join Date: Aug 2003
Location: Northern VA
Posts: 1,614
I had the same deal with my 300-D. The only way I found to regulate the temperature during the winter was to roll down a window! That system didn't work that well.

I still remember driving back to the DC area from Philly in 20 degree weather. My clothes were soaked throughout from sweat!
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Current:
2014 VW Tiguan SEL 4Motion 43,000 miles.

2016 Hyundai Santa Fe Sport (wife's).

Past:
2006 Jetta TDI 135,970 miles. Sold Nov. '13.
1995 E-320 Special Edition. 220,200 miles. Sold Sept. '07.
1987 190-E 16 valve. 153,000 miles. Sold Feb. '06.
1980 300-D 225,000 miles. Donated to the National Kidney Foundation.
1980 240-D manual, 297,500 miles. Totaled by inattentive driver.
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Old 01-28-2004, 06:59 AM
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Join Date: Jan 2002
Location: Mass.
Posts: 2,219
i think if i ever found a junkyard with w123 mbs in it i would be in heaven
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1984 300D Turbo - 231k....totalled 11/30/07 RIP
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Old 01-28-2004, 07:40 AM
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Join Date: Mar 2003
Posts: 173
junkyards

It's funny, the yard I go to has at least 3 of them. I pulled the CCU from an 83? CD. Thats the 2 door model right?. What a shame, only had a minor hit to the door.
On Long Island there is alot of MB in the yards. I think alot were sold in this area.. Although I didn't see this particular car prior, the engine I got from them came out of an 85 with 112k on it. The guy who pulls the motors said it was a shame. The car was mint except it got hit hard in the rear. THey had it running in the yard and because it ran so well, they pulled the motor for resale. Lucky for me..... runs beutiful too...
Mike Moran

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