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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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| I have read all the forums now and have done everything you guys have suggested. Only problem is now you can not control what setting the air blows out of. It will only come out of the A/C vents which is fine until you shut the car off and turn it back on. Now it will blow hot air either out of the A/C vents or out of the defrost. If you unplug the main vaccuum line and plug it back in it may or may not change it back to A/C and coming out of the vents. any suggestions? | |
| Also we did bypass the multi vaccuum line plug and reconnected all the lines with surgecial tubing by color code. Initially when car was started desired vents were blowing cold when engine was turned off and restarted, hot air was blowing from same vents. The blue vaccuum line was disconnected and then reconnnected changed the hot air to cold air blowing back through the vent. The same cycle was repeated several times, with same results. We could hear internally the door which directed hot and cold, actuating after each start up. | |
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I have an 03 Bonneville SLE with a strange quirk. It has the Dual Climate Control with Digital Readout. In the past month or so when I start the car it will light up and appear to be working however no air is coming out the vents. The settings can't be changed (changing to defrost vs. auto etc) .. after a period of time driving down the road (sometimes up to 20 minutes) then it will begin to function normally and then does work fine. I did replace the control unit itself but that hasn't fixed the problem. When it does work all settings can be changed, air blows as it should etc. it will work perfectly .. however the long delays are beyond a nusiance and I'm worried this winter about not having defrost (of course having a/c right now would be nice also) Has anyone else had this problem, any ideas how to fix? |
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I have a 2005 Bonneville. It isn't an SE or anything special. It has been running great until recently. Most of the time when I start the it the heater blows, but sometimes it doesn't. Sometimes when it doesn't start upon initiation, it will eventually come on, other times it just doesn't come on at all. The next time I start the car, it will be working. My original thought was to replace the relay, however when I looked in the fuse box there isn't a relay for the HVAC Solenoid, so I don't know what else to do. I don't have any warning lights on and when the blower is working the heat is great. Any suggestions? MirTrip
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Replying to: MirTrip (Feb 07, 2009 12:50 pm) If it's a Bonneville, it's already special! >Most of the time when I start the it the heater blows, but sometimes it doesn't. I suspect the control on the dash was not the problem. One most likely point is the blower motor itself. Some are having wear on the commutator so that when it stops it may not be making electrical contact. Then when the dash control and the programmer on the heater box say blow, the blower motor doesn't move. When the car hits a bump, or something vibrates the motor, the commutator makes contact and the blower starts working while you're driving. Next time your start the car and turning the blower speed up doesn't result in any air movement, use the toe of your foot on the right side of the hump and tap upward against the blower housing; keep your foot back toward the firewall. Most likely the blower will come on. Keep the key on while you do this. The snap connector in that area may have a burned contact--check it first by disconnecting and looking for burning or melted plastic. There also is a blower control module if you have the automatic control AC unit (C69). These are next to the blower and control the speed using a power transistor. The blower can be replaced easily by removing the plastic panel under the bottom of the dash with a few screws and clips. The blower motor is held in with 3 screws and wiggles out with the squirrel cage attached. Some people say to pull the carpet back from the firewall to allow another inch of room and that will make it easier to wiggle in and out. This requires working lying on the floor and across the seats, but several types of blowers are available on the net. Some are much better quality than others. I'd suggest rockauto.com to look at some of the choices. Click through their online parts list to get to heating and cooling and then to blower motor. |
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This all started when the battery was changed, with no keys in the ignition. ac heater monitor in the dash started blinking the temp and then goes to out side air temp, which does not blink. no hot heat, just warm. unhooked the battery cables tied them together to drain the system, had 4 volts to 0 volts. did not reset the system. programmer moving duct doors correctly, acutator has a hard spot in it and hangs up, (new one on order), when moving rod. can move the rod manually thru access hole in the glove box, get cold and hot air to work properly then. but temp still blinks on dash monitor. any ideas how to correct monitor temp blinking, changed the monitor from one car to another and still blinked. lost and need ideas.
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Replying to: vike2 (Feb 27, 2009 8:59 am)
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Replying to: gennytime (Mar 03, 2009 10:43 am) |
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No matter where the digital temp is set to, 60 -- 90, AC on or off, heat comes out the vents. AC compressor is not cycling, check freon .. OK, so I know it is not low. When temp set to 60, no matter what mode it is in, defrost, at feet or center vents, heat comes out. Could it be the heat divertor? And if so, is it located behind the glove box? What steps do I need to go through to get access to it?
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