No heater blower in any push button position on climate control!

After reading mostly all of the posts here from a search of similar 'heater woes' after my blower quit, I checked #5 fuse and the 30A strip fuse and were good. I also applied 12v to the blower fan which spun OK, however no voltage coming out of the hot lead going to the blower. Next I removed the climate control unit and took off the back cover to expose the circuit board like a few guys had done on this forum. I had not cheked the monovalve or the aux-heater pump yet.

The circuit board looked perfect, but I was prepared to send it out for rebuild anyway. I then got my trusty soldering iron out and said to myself, 'what the heck' and tried what some of you guys had done and reheat the joints.

There are like a thousand joints on this board and I was not going to heat all of them, so I heated up the six joints per push button mount. Also I heated and added solder to the two 12-point power plug joints on the board where the cables plug into the unit and put it back together and threw it back in the car for a test.

"Violla" it now works like a champ! Reassembled the rest of the odds and ends.

My hats off to you fella's for giving me the inspiration to track down this glitch.

No more cold feet! Thanks guys.

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Gerry

59 Ranchero
83 928 Euro S
84 928 Euro S
87 300D Turbo-Frybrid "WVO, Tastes Great - Less Filling"
90 750 IL
91 560 SEL

A combination of wave soldering and vibration causes the solder joint to crack causing open circuits. Adding more solder cures this problem.

Oh, and congratualtions on taking the plunge.

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Regards

Warren

Currently 1965 220Sb, 2002 FORD Crown Vic Police Interceptor

Had 1965 220SEb, 1967 230S, 280SE 4.5, 300SE (W126), 420SEL

ENTER > = (HP RPN)

Not part of the in-crowd since 1952.

A question: why is it often called "heater blower" when it is the same device that blows the air for the air conditioning system?

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1999 Mercedes-Benz S600, 103K miles - garage queen
1988 Mercedes-Benz 560SEL, 89K miles - daily driver
2007 Hyundai Sonata Limited, 31K - daily driver

Thanks Warren. What do you mean by 'wave soldering'?

Braverichard - The term 'heater blower' goes way back to pre-airconditioning days, like in the 1950's and just stuck I guess.

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Gerry

59 Ranchero
83 928 Euro S
84 928 Euro S
87 300D Turbo-Frybrid "WVO, Tastes Great - Less Filling"
90 750 IL
91 560 SEL

HA! That makes sense. Thanks!

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1999 Mercedes-Benz S600, 103K miles - garage queen
1988 Mercedes-Benz 560SEL, 89K miles - daily driver
2007 Hyundai Sonata Limited, 31K - daily driver

Congratulations on fixing your fan. I, also from threads on this forum, did almost the exact things last week on my 300SD and low and behold I now have heat and fan too!!!

Now if someone can come up with a plan to get my tranny to shift up to 3rd (without having to remove it) I will be eternally grateful. Have tried most of the vacuum checks, replaced the 3/2 valves and now have only the Bowden cable to check when I get her on a hoist. Previous owner fractured a line and ran her dry. Any and all suggestions appreaciated.

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The meek shall inherit the earth, the brave shall get the oceans

is a common failure on the w123's all the same? i have a 280e and my climate control dont work . only the defrost works ,could this be a unit or motor issue?