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Vans & Minivans Chevrolet Uplander Chevy Uplander/Pontiac Montana SV6/Saturn Relay/Buick Terraza
2868 messages, Last post on Nov 28, 2009 at 9:31 PM
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Replying to: natenbeckie (Oct 15, 2009 10:50 am) natenbeckie I thought more about your "after 15,000 miles my trans fluid was burnt to a crisp" statement. As a suggestion, do investigate the following troubleshooting ideas: A - Follow the van's current ATF fluid cooling lines and ensure one of them isn't crushed or kinked. And, their piping flow seems to be smooth. Less plumbing elbows, the better. And if one needs elbows around sharp corners, then ensure its a "smooth turn" more then 3" bend elbow as well. And if necessary, replace the factory steel lines (that seem to have too many little bends) with new rubber lines - lines rated for ATF. And, route the new rubber lines in better flow locations. When it comes to fluid flow, less resistance around corners the better. Using replacement piping with larger size "inside" ID is good thing as well. B - Ensure your mechanic installed your existing LPD aux cooler properly. For my wife's 09 van, I took the ATF line out of the "top" of the main rain and re-routed it into the newly installed 5,000 lbs aux cooler. From ATF aux cooler back to the transmission. Thus, ensuring flow is also in the "main rad" as well. For a few pictures, surf: http://i178.photobucket.com/albums/w251/Spike99-Pictures/Montana%20Van/Main-RadT- - - - - - ophose-4.jpg http://i178.photobucket.com/albums/w251/Spike99-Pictures/Montana%20Van/AuxTransC- - - - - - ooler-Lookingdowngrill.jpg http://i178.photobucket.com/albums/w251/Spike99-Pictures/Montana%20Van/AuxTransC- - - - - - ooler-UpperSupport-2.jpg http://i178.photobucket.com/albums/w251/Spike99-Pictures/Montana%20Van/AuxTransC- - - - - - ooler-UpperSupport-1.jpg http://i178.photobucket.com/albums/w251/Spike99-Pictures/Montana%20Van/Main-RadT- - - - - - ophose-1.jpg http://i178.photobucket.com/albums/w251/Spike99-Pictures/Montana%20Van/Hosesinfr- - - - - - ontgrillarea-4.jpg While confirming how to install an aux cooler in my wife's van, I read about a shop that put the transmission's line into the ATF aux cooler rad and back out (and completely bi-passed the van's main rad). OUCH!!!! Definately the wrong install method. For your van's ATF aux cooler install, do ensure its installed properly as well. re: Using both main rad "along with" optional ATF aux cooler rad. For proper cooling, both RADs are needed. C - Install the proper sized LPD aux cooler. To me, the sizing of ATF aux cooler must be for an attached 3,500 lbs trailer (as minimum). If one lives in hilly region, hotter climate, does lots of stop/go traffic and/or often loaded with more weight of 2 people, then use ATF aux cooler sized for attached 5,000 lbs trailer. For example: http://www.bulkpart.com/Merchant2/merchant.mvc?Screen=PROD&Store_Code=2&Product_- - - - - - Code=OC-1678&Category_Code=hayden-transaver&Product_Count=2 D - Do ensure the ATF "flow rate" is ok as well. This can be done by pulling off the transmission rubber lines and sticking both rubber ends into a clean 1 gallon container. Have someone else start the engine, let idle and put into "D" gear, and keep the other foot firmly on its brake pedal (along with emergency brake on). While in "D" gear and idling, ATF oil should spray out of "one" re-routed rubber lines. I cannot remember the exact flow rate but it should be around "minium" 1 gallon per minute. Or was the 3 gallons per minute (????). If your van's oil line don't flow this fast, its internal ATF pump is shot (and needs to be replaced). For exact flow rate (for your van), do "double check" with your local GM mechanic. They have minimum ATF flow rate specs in their Montana Service Manuals. Hope these troubleshooting ideas help your van.... .
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Replying to: natenbeckie (Oct 15, 2009 10:50 am) About the rotors...do you feel the need to replace all four? My issues always seem to be with the front pulsating. Can you put aftermarket (better) rotors up front and leave the GM OEM ones in the back? Thanks, Bill
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| I believe we had the same problem, replacing the fronts with non-cheap rotors stopped the pulsing problem. I think due to mileage we've had them all replaced by now (at a non-GM shop) and haven't had a recurrence. | |
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Replying to: bsrice (Feb 25, 2008 1:56 pm) |
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Replying to: spike99 (Oct 17, 2009 9:09 am) The lines are not kinked. I checked the line flow and its fine. This isn't the first one I have seen like this and my buddy's 07' Impala SS was the same way with the 4T65E-HD. This is another case of GM design and engineering being flawed. In fact, I went over the 30,000 mile fluid service interval on my IS300 (45,000) and I just did a flush on it this past weekend. The fluid was still red. Not the bright translucent red Toyota T-IV is out of the can but it was without a doubt still red. My SV6 on the other hand is showing more hues of brown than red at this point after roughly 32,000 on the fluid with the LPD on it (I installed it at the same time I did the flush). The 3.9 was a much better engine for this van all-around. I wish I had at least waited for it. Better yet, I wish I would have kept my Mazda MPV. |
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Replying to: uplanderguy (Oct 22, 2009 2:02 am) If you look, you will notice the rear pads wear equally as fast as the front, if not faster. I don't know how they have the brake proportioning set up on this thing, but it's heavy on the rear. This is the 2nd set of pads that were put on at the same time as the fronts (first set were the original pads) that have worn as much on the rear as the front. I thought maybe the rear calipers were sticking but they aren't. It's just how it is. |
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Replying to: sv6regal (Mar 19, 2008 7:02 am) |
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So my ABS and TCS lights have started coming on again more and more frequently lately (nearly every time I drive it now). Tonight when I got it home I left it running in the driveway (since it clears the codes when you turn the key off - what a genius idea) and plugged in to it and got a "C0035 - LF wheel speed circuit malfunction." I did a quick Google search and up popped TSB 08-05-25-004. This TSB seems to cover every GM model made in the past 5 years from Vettes to GMC trucks to Caddys. Wonderful GM. So you have a faulty wiring setup on the ABS sensors on all of your late model cars and trucks and you don't do anything about except release a TSB. And shame on the NHTSA for not mandating a recall because the ABS system isn't considered a mandatory safety system. This issue is listed with the NHTSA BTW. Google that TSB...you'll see. Now I am going to have to spend hours of my time tracking down phantom wiring issues with a broken leg and spend money on a replacement harness more than likely. Thanks for the kick in the nards again GM! |
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