1997 Pontiac Bonneville Electronic Climate Control ECC

TODDMHORTON

MEMBER
1997 PONTIAC BONNEVILLE
6 CYL
FWD
AUTOMATIC
148,000 MILES

My cars Electronic Climate Control (ECC) Unit is reading temperatures at 133*F outside. I replaced the ECC unit and I am getting the same thing again. My car constantly blows hot air when the car is running, when I try to switch the air conditioner on it only comes out of the defrost vents only usually its warm, a clicking and howling noise starts when unit comes on but eventually goes away. I can not get heat or air to blow through the front vents. What could be causing this? Any suggestions?

Tuesday, April 14th, 2009 AT 5:13 PM

1 Reply

MERLIN2021

MECHANIC
17,250 POSTS

First the ambient temperature sensor near the radiator needs to be replaced, then check if the compressor comes on when you turn on the A/C, hot air may be an indication you are way to low on refrigerant. Next find the small black vacuum line the goes through the firwall, follow it to both ends, outside it will take you to the manifold supply and a small tank, either the tank is leaking or the hose is not connected, or has a hole in it. Inside it plugs into the control head, and that may also be NG check for vacuum on the inside end of ir.

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Sunday, April 26th, 2009 AT 10:22 AM