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I have a GMC 7500 with an automatic Allison trany. It will not go in reverse when the air temp gets cold.

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Usually it's because the filter is clogged up. Takes a lot of line pressure and volume to operate the reverse servos.

pull the pan and change the filter and fluid. You should find CRUD in the screen. I can't use the word P**P

Posted on Nov 12, 2014

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I have a 6.5l diesel gmc the trany works fine in forward but not in Reverse


Check the fluid level with the motor running and at running temp. Level and if there are metal shavings. If level is good and no shavings then may just need a tranny flush.

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Reverse Gear does not work, Can this be repaired ? or replaced? So I do not use reverse.


This is very common, the reverse gears blows out, the reverse gear and some bushings need replacing, many trany shops wont do it, they rather sell you another trany, we had a retired vw tech that would repair them for us all you did was remove the trany, but anyway it can be repaired the parts cost about 150.00 then the rest is labor,

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Transmission Fluid Capacity?


I will assume you have already drained the trany. You could have measure the fuid out and replaced all but a quart. Estimate what you took out minus a quart and run the trany through all the gears. let is set and measure what you need. Even simpler, get the manual for the unit and look up maintenace.

Jun 20, 2010 | 2002 GMC Sierra 2500HD

1 Answer

After backing out of driveway, doesnt want to go into drive. seems to happen more when its cold


Just by your question I am assuming that it is an automatic trany. Probably a domestic car with about 90+ miles on it.

However, even though I have ESP could you please provide mre details

Isuspect though you need to add trany fluid. Probably an AC-DELCO GM Borg-Warner. if s you neen a reverse clutch band adjustment

Feb 01, 2010 | 2002 Chrysler 300M

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How to troubleshoot automatic transmission of my isuzu automatic transmission


check the fluid. if your having issues thats about all you can do. This is when experience will be able to recommend a fix.

Nov 08, 2009 | 1992 Isuzu Trooper

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My 2008 GMC Yukon Denali blows cold air out from under the dash when the A/C is on. Pretty much freezes your right leg and foot when you drive on a warm day. It's equipped with automatic climate control,...


It was designed that way to keep the electronic's cool in the center control such as the radio ECT. You can control the temp if it get's to cold or have it to blow on the defrost setting (windshild) that may help. Good luck and hope this helps. 

Jun 29, 2009 | 2007 GMC Yukon Denali

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2002 GMC Yukon front A/C blowing warm air


Here is a TSB (Technical Service Bulletin) for your vehicle for loss of temp control.
File In Section: 01 - HVAC
Bulletin No.: 01-01-39-007
TECHNICAL
Subject:
Loss Of HVAC System Mode and/or Temperature Control 

(Reroute Wiring Harness)
Models
1999-2002 Chevrolet and GMC C/K Pickup Models (Silverado and Sierra) 1999-2002 Chevrolet and GMC C/K Utility Models (Avalanche, Suburban, Tahoe, Yukon, Yukon XL, Denali) 2001 GMC Sierra C3
2002 GMC Sierra Denali
2002 Cadillac Escalade, Escalade EXT
Some customers may comment that they cannot control the HVAC system modes and/or the temperature. These concerns may be intermittent.
Cause
There may be poor terminal contact and/or bent terminals in connectors C206 (RPO C68 automatic HVAC controls) or C296 (RPO C60 manual HVAC controls). Excessive tension on the wires due to the wiring harness being miss routed in the instrument panel carrier may cause these conditions.

If the warranty campaign is over i am sure they can or may have in the system on how to correct the problem.
Good luck and hope this helps, keep me posted if you need help on to the repair procedure.


May 26, 2009 | 2002 GMC Yukon Denali

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