Anyone know?

Control head for WHAT? radio, a/c, fuel system??

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MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator

Are you referring to the CFI Control Module?

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1993 190E 2.3
2001 SLK230
1971 LS5 (454) Corvette Convertible

Sounds like american car speak.

You will have to be more descriptive so we know what you mean....

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-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)

Yes, the old Control Head...what are you talking about? I like the sound of it but never heard of it....

In a thread titled 'AC Problems 2 years in a row' below, someone said that the cause of my AC problems sounds like the "control head starting to go bad".

So where is the "control head"?

They are probably describing the dash mounted control!

All a/c/c commands come from the pushbutton control unit.

The blower is controlled from a pushbutton command to the blower regulator.

The a/c compressor is controlled thru the MAS relay by a command from the pushbutton.


What exactly is the problem??

__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator

Hi M.B. Doc;

Thanks for your response. In answer to your question as to what is the problem, I've copied and pasted the pertinant facts from a previous post of mine entitled "AC Help 2 Years in a Row".

1) Yesterday, after leaving my 1991 300E parked all day, the AC never came on upon starting. It had worked fine up until yesterday morning. Now this happened intermittently last year and just as I was at the end of my rope, it started working again and has been for the last 7 months-until yesterday.
Last year, if I would hit the AC off button and then turn it on, I would sometimes hear the vents operate (sounds like it opens or shuts) and the AC would work along with the air recirculating switch. Sometimes back then, as it is doing now, the AC switches don't do anything, the air recirculating switch is doing nothing, and hot air blows out the windshield defroster vents and I can't turn it off.

2) OK, here's a new twist!

After not working for almost 2 weeks and me trying everything to make it work, the AC just started up this morning, the air recirculating button worked, and everything was good with the world again.
For 5 minutes! then it cut off again.
Stopped for a cup of coffee at 7-11, got into the car, and lo and behold it was working again for the ride into work.
So fuses are intact, compressor is working, I'm assuming all the vaccum lines are fine, etc.

Any ideas?

3) In a continuation from the above post:

Parked the car a work for 3 hours (in the sun, if that has any bearing on anything) with the AC system working prior to working.
Got into the car to do errands and the AC was not working again.
Parked the car for approx. 2 hours (in the sun) and upon startup, the AC works again.

Help!

P.S. I went ahead and bought a climate control unit from eBay this morning