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Blazer Jimmy 4WD Questions

76 messages,  Last post on Aug 04, 2008 at 8:04 PM

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#16 of 76 Re: 2003 Chevy Blazer - SAME 4wd problems too! [watertank] by repairdog Feb 03, 2007 (4:19 am)
Replying to: watertank (Feb 02, 2007 3:27 pm) I looked back and never saw if this was a 3 or 4 button dash switch - 4 is Autotrac case. If it went into 4Lo then the front axle coupler worked. 3 button np233 case the encoder steps once to 4HI and sends vac to front actuator via a 3 port vac switch on the case and engages the front drive shaft. Steps again for 4Lo.   Autotrac np 236 case is different and front driveshaft always on. For 4Hi you have a firewall solenoid that the TCCM energizes to supply vac to the front actuator and the encoder only steps for 4LO.   Would look at TCCM,dash switch, 3port or firewall solenoid (by type) or a cut wire/loose connector. First I hope they tried to reset the TCCM by removing power for 30 minutes.
#17 of 76 2004 Blazer 4wd problem by 2004blazer Feb 08, 2007 (2:46 pm)
Sounds like the same problem I am having with my 2004 Blazer. It will go into 2 hi and 4 low the lights will blink but WILL NOT go into 4 hi. Chevy dealership stated that I had to put it on the computer to find out what the exact problem is. ANYBODY KNOW WHAT IT IS AND HOW I CAN FIX IT WITHOUT SPENDING A FORTUNE ?
#18 of 76 Re: 2003 Chevy Blazer recurring 4wd problem [johnnyd69] by grose67 Jul 25, 2007 (9:38 am)
Replying to: johnnyd69 (Dec 08, 2006 9:36 am) I had the type of issue happen on my 95 Blazer. What I found was a kink in the vacum line. Once that was fixed, the 4 wheel drive worked great and has ever since. That was two years ago.
#20 of 76 2001 Blazer 4wd problem by ericsf71 Feb 08, 2007 (12:09 pm)
I'm sure this topic has been discussed on the boards before, but I could not find anything about it. I have a 2001 Chevy Blazer that I've never had a problem with until recently. In the past snowstorm I put it into 4 wheel drive (3 buttons on dashboard) and everything was fine. But when I tried to put it back into 2, it would only blink a few times but go back into 4hi. After turning the car off and back on it eventually went back into 2wd. Now when I try to put it into 4wd, low or hi, I can't. The buttons don't blink, I don't hear any noises or anything. The only way i get anything out of the buttons is if i put it into neutral, in which 4hi and low will blink 2 times but then remain in 2wd. Any ideas on what the problem could be? Could i fix it myself or do i have to take it to a dealer and how much could it cost to fix? Thanks Replies to this message: repairdog (Feb 10, 2007 5:41 am)
#21 of 76 2004 Blazer 4wd maybe same as 2001 Blazer prob. by 2004blazer Feb 08, 2007 (2:45 pm)
Sounds like the same problem I am having with my 2004 Blazer. It will go into 2 hi and 4 low the lights will blink but WILL NOT go into 4 hi. Chevy dealership stated that I had to put it on the computer to find out what the exact problem is. ANYBODY KNOW WHAT IT IS AND HOW I CAN FIX IT WITHOUT SPENDING A FORTUNE ?
#22 of 76 Re: 2001 Blazer 4wd problem [ericsf71] by repairdog Feb 10, 2007 (5:41 am)
Replying to: ericsf71 (Feb 08, 2007 12:09 pm) Check the vac lines under hood and to the reserior drivers side fender. Then 3 port vac switch on transfer case. Then encoder motor must steps once for 4Hi and 2nd time for 4Lo. Then TCCM computer must see all sensors response good. Pull battery power for 30 min and see if TCCM resets. There are many posts on all these found with a search.
#24 of 76 4WD Problems by sandman7 Feb 18, 2007 (12:09 am)
93 chevy s10 Blazer 4wd hi lo switch not working checked accumulator fine replaced 3way ball switch on TC. I can get my 4wd switch to work fine as long as the truck is in neutral it will go into 4wd low-high and back to 2wd. Didnt realize it would work in neutral until after working on truck i realized i was stuck in 4wd high but the light on dash didn't indicate anything got to trying anything to get it out and discovered it worked in neutral. Any advice? Replies to this message: repairdog (Feb 18, 2007 4:27 am)
#25 of 76 Re: 4WD Problems [sandman7] by repairdog Feb 18, 2007 (4:27 am)
Replying to: sandman7 (Feb 18, 2007 12:09 am) N is the only position you can go to 4 Lo in - always was. As for 4Hi the encoder motor probably has rust or crap on it and is hanging up - remove and inspect/replace as necessary. Th edash switch sends a voltage to the TCCM to tell it what to be in and if the lights out thats probably bad or connector to the TCCM dirty. Believe on yours its behind the center console/ashtray area.

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