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Sedans Pontiac Bonneville Pontiac Bonneville Heating/Cooling Problems
148 messages, Last post on Oct 15, 2009 at 1:40 PM
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Replying to: imidazol97 (Aug 18, 2009 12:16 pm) Have to thank you for the advice. Got the freon topped off and the system is working great. Still working on finding the leak (had a dye included with the top off just to see if we can find it), but worst case, I can spend $30 topping it off couple times a year. Definitely worth it, and better than spending a bunch of time and money on suggested fixes from the repair shop that sounded like a whole lot of work for nothing.
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Replying to: txcarnovice (Aug 31, 2009 6:31 am) |
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ok ill try to explain this the best i can when you start the car sometimes the ac will work great then out of the blue it will start blowing warm air sometimes when it does that you can put it in netural and rev it and it will blow cold but only sometimes sometimes it will switch by itself to ac off and pushing any buttons on the switch will not help it just stays ac off now when it first started this you could push the seat memory switch on the door and it would turn the ac back on but now it wont now its like if it is on its on and it may stay on for a second or untill u shut the car off then again it may just switch to ac off and start blowing warm air again to no avail it now seems that if it starts blowing warm air and the ac off is not lit and you put it in nutural and rev it it will make it say ac off and the door switch now seems to do nothing for the help of turning it back on as well im just not sure where to go with this problem i have a very extenstive background in autos but nothing like this have i ever seen please help soon
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Replying to: steve04bonny (Sep 02, 2009 2:53 pm) |
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2000 Bonneville SLE Dual Climate Electronic controls I have read through this thread a few times and have tried several things. First, I topped off the freon but to no avail. Then this afternoon I checked the bleed doors and they were fine. I found 2, one on either side of the main console in the back. I found where they were, then I played with the thermostat to watch how the actuators reacted. I then removed the actuator units and manually turned the doors, just to double check they were opening/closing the door to the min/max. So now I'm stuck. What else could it be? |
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I have a 97 Bonneville Se with an acceleration issue related to the A/C-Heat blower vents. When you are running either a/c or heat and accelerate, the blower vents on dash switch over to the defroster vents until the acceleration stops. It then goes back to working normal. There is no issue with hot changing to cold or cold changing to hot, just vent change over. This system is a standard turn dial controller without digital functions. Any suggestions? I believe it is a vacuum issue but cannot seem to figure out where. I even had the dealer charge me for 6 hours of labor to say they could not find anything. Needless to say, I do not use that Pontiac dealer for anything anymore. Any help would be appreciated.
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Replying to: rockoh (Sep 21, 2009 7:46 am) Maybe this will help. Good luck. |
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Replying to: rockoh (Sep 21, 2009 7:46 am) Your unit uses vacuum to control the diaphragms that are inside the car. Each of these diaphgram motors is a rubber/plastic diaphragm that can tear or crack and leak air in which makes the vacuum the programmer (switch that controls the vacuum) ineffective. There are four of these on the driver's side of the dash. There is a plastic cover under the dash taht comes off with a few screws. You might have a leak in one of the diaphgrams, but you say it occurs in AC or heat. Those use different diaphragms. So back to basics. Your tube for the vacuum comes off the top of the motor (take off the plastic gray cover over the top by removing the oil filler tube--grab with hand and twist to unscrew the spout not the cap). Then look on the back firewall for the 1 ft diameter brake booster. Follow the big tube from it to the motor. Right next to that is a little plastic tube coming out. That's your vacuum line to the inside. That line may be cracked, aged, rotted and leaking air in near the motor due to heat. Follow that line to the passenger side (it goes in a bundle of electrical wires) and you'll find a connection at a Y where one line goes to the inside of the car and the other goes to the front of the car under the fender to a small plastic tank. That tank may be cracked and leaking in air. There is a one-way valve in the line from the engine. It goes in a bundle up behind the alternator then the plastic line goes up over the accumulator and downward behind the wheel well. The valve is right there in a rubber section of the line. It in the line toward the motor and keeps air from going from the motor into the passenger compartment side. That valve may not be working any longer. That would let lower vacuum from the motor add air to the passenger side when you accelerate and the motor loses vacuum because you've opened the throttle plate wide. There have been a few comments about leaking air around the upper intake manifold where it bolts to the metal lower intake. But you don't mention any rough running at times or fast idle, which would be symptoms if the upper were twisting and leaking air in at certain temperatures. Something to try is run the motor and turn it off. Then leave the key ON and push buttons to select different settings on the HVAC unit. With my 1998 I can do that for about 20 seconds or more of listening to the vacuum motors pull the different plates in the box to change the air flow. If yours does not retain vacuum in the storage tank under the front fender enough to do 5 or 6 change cycles that might indicate a leak in a tube after the one-way valve such as the tank at the front or a part inside the car.
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Just bought a 2000 bonneville from an auction and the hvac doesnt work at all. No display in the window. Buttons dont light up. Checked the fuses under the hood and under rear seat. None are blown. Had a mechanic scan but no error codes for the hvac. Gotta few other problems too but this is the main one. Thans for any help.
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Replying to: cmazeo (Oct 01, 2009 12:37 pm)
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