A/C - Heater problem
Thread Starter
Cruising
Joined: Oct 2012
Posts: 11
Likes: 0
From: Pittsburgh PA
A/C - Heater problem
Hi All,
I have a 1989 C-4 with an A/C - Heater problem.
I think it needs a new head control unit, please let me know if I'm on the right track.
It will not change from heat to cool, the previous owner has put a manual shut off in the heater line, if shut off the A/C blows nice and cold, if not it's always hot. Also it will not change from vent to floor / defrost, ETC.
Has anyone else run across this problem? And if so was the control unit the fix.
Thank you
Mike
I have a 1989 C-4 with an A/C - Heater problem.
I think it needs a new head control unit, please let me know if I'm on the right track.
It will not change from heat to cool, the previous owner has put a manual shut off in the heater line, if shut off the A/C blows nice and cold, if not it's always hot. Also it will not change from vent to floor / defrost, ETC.
Has anyone else run across this problem? And if so was the control unit the fix.
Thank you
Mike
Drifting
Joined: Jul 2012
Posts: 1,796
Likes: 14
From: Nampa Idaho
Drifting
Joined: Sep 2003
Posts: 1,363
Likes: 7
From: 1994 LT1 Coupe 6-speed with FX3 & 2000 LS1 Vert 6-Speed with F45 Hunterdon County, NJ
Hi All,
I have a 1989 C-4 with an A/C - Heater problem.
I think it needs a new head control unit, please let me know if I'm on the right track.
It will not change from heat to cool, the previous owner has put a manual shut off in the heater line, if shut off the A/C blows nice and cold, if not it's always hot. Also it will not change from vent to floor / defrost, ETC.
Has anyone else run across this problem? And if so was the control unit the fix.
Thank you
Mike
I have a 1989 C-4 with an A/C - Heater problem.
I think it needs a new head control unit, please let me know if I'm on the right track.
It will not change from heat to cool, the previous owner has put a manual shut off in the heater line, if shut off the A/C blows nice and cold, if not it's always hot. Also it will not change from vent to floor / defrost, ETC.
Has anyone else run across this problem? And if so was the control unit the fix.
Thank you
Mike
there is a rubber membrane behind the buttons, which have carbon buttons behind the membrane which when pushed, contact the circuit board behind.
Careful Disasembly of the console and trim ring and then the control head, and then careful disasembly of the control head and gentle cleaning of the carbon buttons with cotton swab with isopropyl alcohol and a gentle cleaning of the circuit board contacts with a pencil eraser will likley restore it to full working order.
Consider doing radio at same time as it often suffers from the same problem.
