Last post on Jun 21, 2010 at 4:34 PM
You are in the Pontiac Montana
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Pontiac Montana, Pontiac Montana SV6, Van
#69 of 78 Re: piece of crap [meechellla]
Jul 30, 2012 (5:27 am)
I have read a lot of problems since I posted my problem a couple of years ago.
I have a 1999 Montana and the transmission problem of hard shifting sometimes is still there. I have run this Montana with no other major problem for over 260,000 miles and still going. I have had excellent mileage all the while.
#70 of 78 Transmission problems?
Nov 18, 2012 (8:00 pm)
I just bought a used 2003 Pontiac Montana. It has around 135,000. Everything runs great however I have noticed a little problem with the transmission. It's kinda mysterious. I changed the fluid and filter when I first got it. It was pretty black. Presumably had not been changed ever. Not copius amounts of 'gray sludge' on the magnet. Not more than one woudl expect after 135,000 miles. Now here is the problem. When the car is first started up. Doesn't matter car temperature, outdoor temperature, or any other condition that I can think of. But when you back up for the first time after starting it and then put it into drive, it seems to slip. Or almost have that peeling out on gravel feeling to it. But then drives fine the rest of the trip. If you put it in park then reverse then drive to try it again it does not do it. However, if you shut the car off and do those steps again, it will happen. Only on the first reverse then drive sequence after startup. Any ideas? Kinda of a wierd problem. Or maybe not and someone knows what is causing this. I feel that it is electrical or something where it only happens once after startup. I would appreciate the help. Thanks in advance.
#71 of 78 Re: Transmission problems? [airthumper]
Nov 24, 2012 (7:42 pm)
I have a 03 Montana also. Transmission has some major slips. Had the entire thing extensively cleaned this past spring. I am looking at having it re-built this spring. According to my mechanic, there are several original parts, that now have 'replacements'. In his words...Pontiac found a problem, and fixed the repair parts. But left we owners in the cold on having them installed. I had a problem with the transmission not wanting to 'adjust', after slow downs to turn a corner, way back in 04. The dealer then applied a software update to the computer. Seemed to help for about 6 months. The only other real problems I've had were having to replace the master switch for the front windows (did that myself), and I now need to replace the master switch for the power locks and also the headlight housings. But when I compare my Montana, to my ex's Blazer and all the repair costs he's had...I'll take my Montana any day!
But I do feel that Pontiac should do something in regards to the transmission problems and the headlights. They did have a TSB issued on the headlights...but it was never turned into a recall.
#72 of 78 2001 Montana
Sep 20, 2013 (6:38 pm)
Hey guys, I have a 2001 Montana, it has 149,000 miles on it. The van runs great until the transmission gets up to standard temperature, and then there is a major skip that persists when its about to shift into 4th gear. Then once it starts it will also skip slightly anytime you lighten or even completely let off of the throttle. has anybody else encountered these issues? and if so, what did you find out about it?
#73 of 78 Transmission/Air Conditioning Problem
Jun 21, 2010 (4:34 pm)
#74 of 78 Transmission/Air Conditioning Problem
Jun 20, 2010 (7:14 am)
I have a 2000 Pontiac Montana with 150K miles on it. The problem is that when I've had the air on for 20 min or so, the transmission slips. "Clunk"s from gear to gear, and doesn't get better when you turn the air off. Only gets better when engine has been allowed to cool somewhat. Can anyone help me?
#75 of 78 Re: Transmission/Air Conditioning Problem [dustinian]
Jun 20, 2010 (9:13 pm)
Most likely your a/c on has nothing to do with the noises that occur after the engine is warm, only to make it warm up faster. Using the 'Mechanic's Guide to Consumer Noises" , A clunking from gear to gear could be motor mounts. A good visual check while someone shifts from park to drive, and be sure to try reverse too. While brakes applied, in drive, a small amount of accel to load the engine up could see if the engine/tranny is twisting to 'bump' the frame somewhere.
#76 of 78 Re: Transmission/Air Conditioning Problem [dustinian]
Jun 21, 2010 (10:10 am)
The 4T65E transmission (used with many GM 3.4 to 3.9 L engines) is average quality built. Its electronic shift based (compred to mechical shift based) and tends to run very hot. The hotter it runs, the higher the risk of problems. Even for no trailer hitch GM mini-vans, my transmission specialist recommends addition of ATF aux LPD design cooler. To him and his experience with the 4T65E transmission, GM should include ATF aux cooler with their minimum factory build. Especially if one lives in hotter climate and/or hilly regions (and don't exceed 2 passanger hauling). These transmisisons run hot and the heat creates damage.
Based on clunking sounds, it sounds like a professional needs to replace a few individual parts and/or perform a performance re-build to it. To learn more about this specific transmission and its "common" known failures, surf entire contents of: http://www.tripleedgeperformance.com/4T65E_Transmission_Info.php
After transmission is fixed (individual part replacements and/or total re-buid with a performance kit), I'd install an ATF aux cooler in your van as well. Install LPD design rated for attached 5,000 lbs trailer. Thus, making it run cooler - even for non-towing and non-hauling driving conditions.
For my wife's Montana van, I installed http://www.transmissioncoolers.us/Merchant2/merchant.mvc?Screen=PROD&Product_Cod- - - - - - e=1678&Category_Code=hayden-transaver-cooler&Product_Count=2
For my wife's van and its better then factor ATF cooling system, it's been running great since installing this larger then needed ATF aux cooler.
Hope this helps...
#77 of 78 Re: Transmission/Air Conditioning Problem [spike99]
Jun 21, 2010 (11:46 am)
Thanks! Have any details you would like to share on how you installed it? Where you put the cooler, how you mounted it then most importantly what steps you took to actually hook it up and what parts you required? (item numbers you ordered and where you got them)? Only if you are willing... there certainly are alot of readers looking at this - the montana's a notorious for these problems... I might just attempt this summer to follow your lead if you are willing to share to the novice. Thanks.
#78 of 78 Re: Transmission/Air Conditioning Problem [mail]
Jun 21, 2010 (4:34 pm)
I bought a Hayden brand LPD (Low Pressure Drop) cooler at my local NAPA Auto Parts store. I hear Tru-Cool LPD brand is the best. Was told that Hayden brand is a "less expensive" clone of Tru-Cool LPD brand. re: http://www.makcotransmissionparts.com/OC-1678.html
For its install, I never liked the idea of sucking an ATF cooler against the AC rad using those plastic fasteners. Steel on steel with vibration worries me. Thus, I first installed 2 x vertical "L" braces in front of our van's AC Rad. Simply cut and use slude hammer to flatten out both "L" bracing ends. Used self tapping screws with thread lock juice on their threads.
For pictures of Hayden LPD aux cooler install in my wife's van, surf:
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/Aux-Coole- - r-Tophose.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-LowerSupport-1.jpg
http://i178.photobucket.com/albums/w251/Spike99-Pictures/Montana%20Van/Main-RadT- - ophose-2.jpg
For its main RAD connection (at its top rad position), I removed its factory "L" pipe, installed a brass fitting and new "L" 90 degree elbow. Obtained these items from my local NAPA store as well. Remember that ATF flow is: from tranny, to main rad, to aux cooler, then back to tranny.
For front grill rubber tube hoses, I tool my steel cutters and made the factory round hole into a large square shape. This round hole is located under battery box (on my wife's van). Enlarging his factory front grill round hole took longer time then mounting the aux rad in the front grill area. For its ATF rated rubber lines and their "touch points", I slide large 1" rubber tube around them. Thus, adding more "wear" protection around the rubber hoses. re: http://i178.photobucket.com/albums/w251/Spike99-Pictures/Montana%20Van/Hosesinfr- - ontgrillarea-1.jpg
This worked on my wife's 09 Montana van. Will work on your GM mini-van as well...