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Pontiac Bonneville Heating/Cooling Problems

231 messages,  Last post on Feb 13, 2013 at 8:44 PM

You are in the Pontiac Bonneville Forum.

What is this discussion about? Pontiac Bonneville, Heating / Cooling, Sedan

Messages Page 23 of 24

#213 of 231 Re: Blower motor on a 96 bonneville [wolfman2020] by imidazol97

Mar 31, 2012 (4:56 am)

Replying to: wolfman2020 (Mar 30, 2012 7:53 pm)
Why would you replace the blower motor? If it runs on the 3 lower speeds, that means the fan motor is okay.
 
Notice there is a separate circuit for the highest speed due to the high current draw. IIRC it has its own fuse in the relay center under the hood. AND it has its own relay. Either of those may have failed. The relay is in the relay center under the hood.
 
If you are able to do some electric troubleshooting, test for power on the purple line to the blower motor when the fan switch is on HIGH and the key is ON. You probably are getting 12 volts on the other 3 speeds and then when you switch to HIGH, the voltage drops to zero.
 
The cover for the relay center comes off easily. I do not know if there is a diagram in it showing which large fuse goes to which circuit. You may have to test each of them for 12 volts on both poles.

#214 of 231 Re: Blower motor on a 96 bonneville [imidazol97] by wolfman2020

Mar 31, 2012 (6:34 pm)

Replying to: imidazol97 (Mar 31, 2012 4:56 am)
Thanks for the help I can definately do a voltage test to the blower motor,,Is the motor under the dash or under the hood? Or should I just check it at switch?? Thanks again WM

#215 of 231 Re: Blower motor on a 96 bonneville [wolfman2020] by imidazol97

Apr 01, 2012 (8:23 am)

Replying to: wolfman2020 (Mar 31, 2012 6:34 pm)
Blower motor is on the firewall center behind the engine. It has a round cover with 5-7 screws holding it in. Follow the leads from the motor up to the top of the air passage that carries the air from the blwoer motor.

#216 of 231 Re: Blower motor on a 96 bonneville [imidazol97] by wolfman2020

Apr 04, 2012 (9:00 am)

Replying to: imidazol97 (Apr 01, 2012 8:23 am)
Thank you again it was the fuse and its working. Now Im having trouble with the engine shutting off intermitent. I think it may be the ignition switch because I can wiggle it and it will come back on. How does the switch come out, do I have to pull the steering wheel or is there an easy way to change it,,thank you again . I'm a motorcycle mechanic and working on cars tends to make me crazy

#217 of 231 Re: Blower motor on a 96 bonneville [wolfman2020] by imidazol97

Apr 04, 2012 (9:30 am)

Replying to: wolfman2020 (Apr 04, 2012 9:00 am)
The ignition switch itself is on the top of the steering column under the dash. It's linked to the lock cylinder at the top by some kind of rod. Many people think it's up at the top with the lock cylinder.
 
Several H-body posters have had problems with the switch. Check rockauto.com for it and look for a 5% discount code that goes into the "where did you hear about us" box.
 
To replace must not be terribly difficult from what folks in Pontiac forums have said. That's as long as you can get your body in there between the door frame and the seat or lie upside down on the seat and hang over down onto the floor. I worked under there on the diaphragms for the HVAC control valves, but I didn't check on how the ignition switch looked.
 
Part #80
I suspect you need to disable the air bags to do this.
 

#218 of 231 Heat is constantly on by nburkholder

May 26, 2012 (2:36 pm)

Hi,
I have a 96 Bonneville and got the a/c fixed a few summers ago and then it went out again the next summer. I don’t want to dump a ton of money into it but it allows heat in on the floor board all the time. When i turn the blower on i can switch between floor, vent, and defrost, but when everything is off heat pores in from the floor board making summers miserable. What can i do so that when the unit is off no air comes through any port?

#219 of 231 Heat flows through vents by nburkholder

May 26, 2012 (6:56 pm)

Hi,
I have a 96 Bonneville and got the a/c fixed a few summers ago and then it went out again the next summer. I don’t want to dump a ton of money into it but it allows heat in thru all vents, floorboard vent, and defrost at all times. When i turn the blower on i can switch between floor, vent, and defrost, but when everything is off heat continues to flow in thru all vents though the blower is off. Please help!!!

#220 of 231 96 Bonneville no heat by tgonya

Nov 26, 2012 (8:35 am)

I have a 96 Bonneville with 200K milage and have been experiencing the heat issues that evidently many other bonneville owners have suffered. (i.e. the system closes the blend door after about a minute of operation and only cold air comes out after that).
 
Reading through all the various discussions on this particular issue (and trying all the various solutions offered), I've come to the conclusion that it's something that is a) quite common to this particular heating system, and b) even if I replace all the electronic parts (have replaced the "head unit" already), there's no guaranteeing this won't happen yet again.
 
So, my question here is simply how do I go about disconnecting the actuator motor (hopefully without damaging it) to where the blend door stays in the "heat position"? Any pictures would be GREATLY appreciated!
 
Thanks in advance for any and all help offered!
 
Signed,
 
Tom, aka Cold in Allentown, Pa

#221 of 231 Re: 96 Bonneville no heat [tgonya] by tgonya

Nov 26, 2012 (9:23 am)

Replying to: tgonya (Nov 26, 2012 8:35 am)
By the way, just so we're on the same page so to speak, this is a picture of the dashboard...
 

#222 of 231 Re: 96 Bonneville no heat [tgonya] by imidazol97

Nov 26, 2012 (5:41 pm)

Replying to: tgonya (Nov 26, 2012 8:35 am)
Most likely your actuator has had a gear inside crack which reduces the pressure fit it has on the axle which extends out of the actuator to actually push and pull on the rod to the blend door.
 
The Buick has easier access to this actuator than the Bonneville due to a different design of the dash. Some had pulled the glovebox door forward so they can see through to the top of the heater box or removed the door. There is a view to the rod which has a brace rod in the path but there is a hole in the brace allowing a view of the rod. They have actually ducttaped (IIRC) a clothes hanger wire to the rode to be able to manually adjust it, i.e., keep it from moving on its own.
 
The actuator can be removed by two screws and disconnecting the electrical connector, but space is tight. Use methods to avoid dropping the screws or losing the sockets if they come off your wrench.
 
Here's a link: link title

Messages Page 23 of 24

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