more a/c questions

[bill5674]

Have not found this problem in the search so here goes.have automatic climate controle.set a/c to anything below ambent temp.blows fine sometimes allday most times only for a few seconds.will jump to 75 and blower will set to zero. no codes on the head unit.swapped it out with a known good one same .Has any one had this before ..thanks..

 

[tonylong]

I replace my head unit several years ago. I know I broke the light blue locking clip on the connector, and it sometimes loosens - then it does the AC temp defaults to 75, and AUTO mode. Since I normally keep it at 66 and ECON I notice the change. Could be a marginal connector ?, or ground ?
HTH

 

[bill5674]

thanks for the reply,tried that already ...no luck. think i have a problem with he controle module under the dash.it takes the signal from the head and open and closes the proper vent/door by vacumm. was hoping someone has been there already.not much fun getting under the dash,and the sevive manule has No vacumm routing at all.