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Pontiac Bonneville A/C And Heater Problems
2001 Pontiac Bonneville.
Question = my a/c quit working ,did not lose charge ,clutch is not engaging,fan blows ok
,controls slow speed and fast work ok ,checked a/c fuse ok,relay ok


JK:
A few things.
Must be sure there is good freon charge.
Are you familiar with the use of a test light or volt meter along with a schematic. I can get
you a  schematic with some help of what circuits to test. The a/c control head sends a
request for clutch operation to the powertrain control  module(PCM). The PCM looks at a
few things to determine if the clutch should be engaged.  The PCM grounds the a/c
clutch relay, and voltage is sent to the a/c clutch on the DARK  GREEN wire, and the
BLACK wire on the clutch is the ground side.

VISITOR:
Yes i have a test light and meter. A schematic would be great, thanks.

JK:
OK. I will e-mail that info out to you. Let me know if you need more help.


1996 Bonneville.
Engine size  6 cylinder.
Question = Speed control will not work in 90 or above degrees hot weather except when
going 70 or above MPH.  I have been speeding up to 70 MPH and then pushing the slow
button to desired speed. Any suggestions?  Bill


Answer: Check all vacuum lines and connections coming from cruise control module to
intake  manifold. Possible bad diaphragm in cruise unit, can check with vacuum pump,
hotter weather  would make vacuum leaks more noticeable. Heat could also make an
electrical issue more  prevalent although speed should not. The only exception would be a
vehicle speed sensor that  is not reading correctly. Wiring should be checked from the
speed sensor on the transmission  to the cruise control switch and to the cruise control
module under the hood. The best time to  check for problems is when the cruise control is
acting up on a hot day.


Pontiac Bonneville SSE. 3.8 supercharged.
Question: heater fan does not work all the time ,i have to open hood and hit it with heavy
wrench to make it work  ,please help.

Answer: The motor on the fan is obviously getting stuck, and  probably won't function at all
pretty soon if you have to hit it every  time you want it to turn on. You need to replace the
blower motor  with a new one to fix your problem. You might want to check the  wiring as
well, if the motor was getting hot, it could have burnt up the wiring which will just cause
other problems as well.