If you remove the temperature wheel (quite easy) you can inspect for breaks in the circuitry. Then swap it with a temperature reel from another ACC module. That worked for me.
On Wed, Nov 30, 2011 at 12:36 PM, Rich Thomas < richthomas79td...@constructivity.net> wrote: > Sounds like the control unit is not controlling. Might want to take it > out and see if anything on it (like maybe the wheel contacts) is corroded, > broken, fried, worn out, whatever. > > --R > > > On 11/30/11 12:24 PM, Mike Esh wrote: > >> I am still having trouble regulating heat in my 84 300D. I either get >> all heat or all cold. Cold only coming on when temp wheel is rotated all >> the way to max cool. >> >> Current readings are at Mono valve are as follows: >> 12 volts when system is off. >> >> System on any of the 3 center buttons pushed: >> 12 volts when temp wheel is set to full cool or full heat. zero volts >> when temp dial is moved to any other position. >> >> Zero volts when defrost button is pushed. >> >> Is this correct? Any suggestions? >> >> I have replaced mono valve already. >> Thanks, >> Mike >> Michael E. Esh >> >> >> ______________________________**_________ >> http://www.okiebenz.com >> For new and used parts go to www.okiebenz.com >> To search list archives >> http://www.okiebenz.com/**archive/<http://www.okiebenz.com/archive/> >> >> To Unsubscribe or change delivery options go to: >> http://mail.okiebenz.com/**mailman/listinfo/mercedes_**okiebenz.com<http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com> >> >> > ______________________________**_________ > http://www.okiebenz.com > For new and used parts go to www.okiebenz.com > To search list archives > http://www.okiebenz.com/**archive/<http://www.okiebenz.com/archive/> > > To Unsubscribe or change delivery options go to: > http://mail.okiebenz.com/**mailman/listinfo/mercedes_**okiebenz.com<http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com> > _______________________________________ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
