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SUVs Chevrolet Suburban & Tahoe Chevrolet Suburban and Tahoe AC and Climate Control Questions
136 messages, Last post on Nov 05, 2009 at 9:24 AM
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Replying to: nflguy (Aug 04, 2008 12:19 pm) Automatic system does change fan speed according to temperature reading inside the vehicle. A sudden change in fan speed can happen for example if the driver's head is located too close to the air temperature "sampler" intake in the ceiling and suddenly changes distance to the sampler. Help for this issue is to set driver's seat lower so that head is not too close to the sampler intake at any time. Sounds weird but drivers head being too close to this small "speaker looking" air intake can change air temperature entering inside the tube where temperature is measured. This happened to me and I had to lower my seat down from where I first wanted to have it. Above assumes that the air temperature measurement is made to work the same way as in '04 Tahoe with automatic climate control. If your system is a manual climate control and has fixed fan speeds and fan speed suddenly changes you have an issue, which must be fan or fan speed controller related. Arrie
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Replying to: arrie (Aug 04, 2008 2:03 pm) This is a VERY frustrating problem. I'm likely to be out of warranty by the time next summer rolls around so I wanna get this fixed asap. They said nothing was wrong the first few times they checked it out. The problem got worse and worse until eventually the max air button would click off on it's own even though we were on manual setting. I brought it in again and they said the aspirator was bad (the thing above your head) so they replaced it. Now the max ac button no longer shuts off on it's own but the brief changes in fan speed have returned. I fear it's some kind of electrical issue with voltage problems on the blower resistor. The problem is that dealers rely on the vehicle computer system when deciding if replacing parts is needed. If there is a problem but the computer doesn't show it (via codes) then the dealer won't do anything to fix.
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Replying to: nflguy (Aug 04, 2008 8:37 pm) GM is in so deep mess at the moment they cannot afford fixing vehicles on warranty unless they absolutely have to. Issue like yours, if not absolutely repeated at the dealer's service shop and you having witness with you will not be repaired on warranty but as your warranty goes out I can guarantee they will want to change all kinds of parts on it as it will be done on your dime. I had to trouble shoot and fix my car myself after the first about 2000 miles when fuel consumption went from 18+ MPG to 13 MPG on highway driving. Dealer claimed there was nothing wrong as there were no trouble codes in computer. I found all sorts of problems the intake manifold leak being the biggest one...and whole bunch of improper electrical connections on wire harnesses... Good luck with yours. Arrie
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Replying to: arrie (Aug 05, 2008 1:31 am)
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Replying to: nflguy (Aug 05, 2008 9:57 am) I have been buying "little used" 2 - 3 years old cars before as I am kind of a mechanic and fixing cars for me is easy unless it is a computer issue or something like that. After years saving money I finally was able to consider buying a new vehicle and it sounded so good not needing to work on it. It cost almost $40 000 to get my hands on this Tahoe LT and then all but trouble. And chevy dealer does not do anything to fix it. Tail pipe looks like it burns a gallon of oil between oil changes, but it did not and still does not burn any oil. It just sent unburned fuel thru tail pipe as engine was not working at the most effective way and biggest problem with this seemed to be intake manifold gasket leak. Believe or not but it has a lot to do with engine performance as leak changes MAP sensor reading, which is part of controlling ignition timing. Leaking intake manifold gasket also caused rough or jerking idle. I also soldered almost all wires to the pins at sensor harnesses. I believe the only one I have not done yet is the crank shaft position sensor wire harness and that is because it is not easy to get to. Starter motor has to be removed to gain access to it. My Tahoe works quite well now and I still get about 18 MPG with 77 MPH speed on highway. I have 94 000 miles on it. Last scare was coolant level dropping off but it seems to have fixed itself after I poured some Bar's leak fix in it. Arrie
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Replying to: arrie (Aug 05, 2008 3:40 pm) I dropped the tahoe off this morning and showed the tech guys how my ac fan speed will go up and down even when parked. They called and said they can't figure it out so they are gonna replace the control head. Well see if it works. |
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Replying to: arrie (Jul 21, 2008 8:28 am) |
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Replying to: treedog (Aug 27, 2008 6:53 pm) Regards.
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Replying to: natale (Aug 28, 2008 3:09 am) Basically, we were looking at at least $1500 in repairs to possibly fix the issue on a truck that's worth $5000 and needs new plugs and wires and new tires. $3000 total. I just can't do that right now. So, DH can suffer his 2.5 mile commute w/o AC for a few more weeks. Good luck figuring out the issue. I'll check back to see if anyone does find a resolution. The guy who did most of the work for me thinks the tensioner is a piece of crap and Chevy should have made it heavier. FWIW.
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Replying to: waltherchic (Aug 28, 2008 4:22 am) |
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