Pontiac Bonneville Heating/Cooling Problems

The outdoor temp sensor is on the vertical metal bracket that is in front of the radiator--it probably holds the hood latch. It's a sensor about the size of your thumb with electrical wires going to it. Be sure you don't mess with anything with yellow wires; those are the airbag sensors for crash.

#194 of 231 Re: Climate control stuck at 90 degrees [khalid2] by imidazol97

Jan 20, 2011 (3:45 pm)

Replying to: khalid2 (Jan 20, 2011 12:50 pm)

Try disconnecting the plug at the sensor and see if the system goes to a default value for outside temp.

If the car senses the outside is 90, it's not going to give you much heat inside.

Sometimes the connectors get corroded. Try reconnecting it to get a good connection. They do go bad. About $13 at Rockauto.com

There is a remote possibility the electric actuator that moves the heat blend door inside the heater broke when you reconnected the battery. But get the outside sensor working right first before worrying about that.

Replies to this message:

khalid2 (Jan 21, 2011 5:50 pm)
- imidazol97 (Jan 21, 2011 6:33 pm)

#195 of 231 Re: Climate control stuck at 90 degrees [khalid2] by kevin27518

Jan 21, 2011 (9:41 am)

Replying to: khalid2 (Jan 20, 2011 12:48 pm)

Open your hood and look down at the center of the radiator near the bottom if it.

#196 of 231 Re: Climate control stuck at 90 degrees [imidazol97] by khalid2

Jan 21, 2011 (5:50 pm)

Replying to: imidazol97 (Jan 20, 2011 3:45 pm)

thank you bro, but still not working, sensor is still flashing, when i turn the heat on, for about 30 seconds it works good but after that only cold air comes out. it happens most of the times, but some times i get perfect heating. do you have any idea?

Replies to this message:

imidazol97 (Jan 21, 2011 6:33 pm)

#197 of 231 Re: Climate control stuck at 90 degrees [khalid2] by imidazol97

Jan 21, 2011 (6:33 pm)

Replying to: khalid2 (Jan 21, 2011 5:50 pm)

Next step is take off the underdash panel on the passenger side. Locate the programmer box on the corner of the heater box. Look for the electric actuator on top with little wires going to the programmer box.

Watch the rod on the actuator as the arm swings when you move the temp from cold to hot to cold. Leave some time for the computer to react.

The movement should be steady. If it's jerky the gear on the actuator is slipping on the hub inside the actuator. Some people have removed the glovebox and put a coathanger through a hole in a brace on the dash on ceertain models of Bonneville to the rod sticking out of the heater box that connects to the actuator link. They just snap together from the rear. They use that to adjust the heat until they can get to taking out the actuator for replacement or repair. It has two small screws that hold it in. On Bonnevilles they are tighter to get to than in leSabres.

If you can move the link with one finger by making the gear slip on the hub inside the actuator, that verifies what has happened.

I made sure the gear was in a part of the movement range where the blue gear wouldn't hit the crack and glued mine to the hub with a little 5-minute epoxy.

#198 of 231 99 Bonneville by gbowie

Jan 30, 2011 (2:43 pm)

I have a 99 Bonneville. Every time i start the car the temp setting flashes for about 1-2 minutes. I then have to bring the temperature setting down to 60 degrees, wait a couple of minutes & then bring the setting up to 90 to get heat. This happens everytime I turn the car off. The dealer cleared the codes (1040 & 1052) & it worked for a week until i disconnected the battery. I had the dealer clear the code again but this time it didn't solve the problem. The car is warmed up. Any one have suggestions?

Replies to this message:

imidazol97 (Jan 30, 2011 3:15 pm)

#199 of 231 Re: 99 Bonneville [gbowie] by imidazol97

Jan 30, 2011 (3:15 pm)

Replying to: gbowie (Jan 30, 2011 2:43 pm)

See post before yours. It's likely your problem is the electric actuator motor. the flashing may be because the unit can't operate the temp control properly or some cars sense a low coolant (freon) level because of the cold temps. But take a physical look at the movement of your actuator links.\

Good luck.

#200 of 231 no air at main vents by pooh4949

Jun 03, 2011 (4:51 pm)

Good Day All,
My 1996 Bonneville SE with climate control will not divert the air to the main vents. The only way it will come out is at the defrost and floor. What is the problem?

Many Thanks
David

Replies to this message:

imidazol97 (Jun 03, 2011 6:23 pm)

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