Last post on Jul 16, 2013 at 4:58 PM
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#2561 of 3676 97 Jimmy - No speedo, won't shift, ABS light
Aug 01, 2006 (7:47 pm)
Freaky thing. 1997 GMC Jimmy SLT 4WD 130K was running fine. Parked for 5 days and then encountered this problem. Starts fine. Idles fine. No warning lights. Put in Drive and get about a hundred feet but won't shift thru the gears (stuck in 2nd?), speedometer not working and the ABS light comes on. Turn the car off. No warning lights and the process repeats.
Could this be a problem with the speed sensor? If yes, where is it located, what does it look like, and how do I fix it?
Thanks in advance!
#2562 of 3676 Front Axle clicking/griding
Aug 01, 2006 (11:02 pm)
I found the problem to the clicking in the front axle. It turns out the vac. actuator under the battery tray was being engaged for some reason. It was causeing the cable to the diff. to be pulled in 2HI. I disconnected the cable from the actuator and there is no more clicking. Would the vac. switch be the cause of all this trouble? I can't find any vac. diagrams in a repair manual. Any help with this would be greatly appreciated
#2563 of 3676 Re: Front Axle clicking/griding [3521bytrade]
Aug 02, 2006 (1:27 am)
If vac is applied to the actuator then the coupler should be engaged - if you simply pulled the vac line to it from the intake it should have uncoupled. Look on the firewall and you should have a small solenoid that controls the vac down to the actuator - when 4Hi on the output side should have no vac and when 4wd on Hi/Lo/Auto (if you have 4 button) the vac should be on to the actuator. Also if not the small $15 solenoid then on to removing battery power for 30 minutes and see if the TCCM (4wd computer) resets.
#2564 of 3676 Re: 97 Jimmy - No speedo, won't shift, ABS light [pro1600]
Aug 02, 2006 (1:33 am)
To be sure need an ABS scanner to read the code (s).
Each front wheel hub has a speed sensor and then one in the transfer case for the rears. The front sensors sense as square cogs/gears go by - you can unbolt the 2 sensor torx head bolts and see the cogs and check if all there and also see if the sensor wire is intact and a connector about 2' up on the frame (for replacing the sensor that comes with the wire pigtail). The no speedo seems to point more toward electrical and 97 is known for a faulty ignition module in the steering column (not the key/tumbler) and many posts on it and it causes many strange problems - most power goes thru it or is activated thru it.
#2565 of 3676 Blazer/Jimmy A/C Blows Hot Air Blend Door
Aug 02, 2006 (11:35 am)
Thanks again, Repairdog. I appreciate your time.
Nothing changed, unfortunately. I tried the RDO/BATT fuse a few times, and then I moved on to other fuses in hopes that something would reset or cycle. I've tried everything but the ECM fuses, which I'll pull and replace tonight.
The monkeying did confirm that the A/C works, apparently, because it blows cold air until the engine warms up. Then it becomes a blast furnace inside.
Does anyone know where the blend motor is buried in the heater box? I see that there's a "cut here for service" knockout on top of the heater box, under the hood. I thought maybe I could rig the blend door with a coathanger or something--anything to avoid tearing the whole vehicle apart while it's 100 degrees outside, not to mention the cost.
#2566 of 3676 Re: Blazer/Jimmy A/C Blows Hot Air Blend Door [stuntman12]
Aug 02, 2006 (12:36 pm)
Pull the glove box open (bend the piece in to get it to drop all the way down) and you will see it on the top of the box - inside the cab - believ you can remove the 2 screws that hold it on and the other in rear is not a screw but a small bump to position it - as I've read on this but not done this one myself. Info online if you look for blazer heater blend motor. It has a plastic drive gear that may strip.
#2567 of 3676 GM Climate Control Hot Air from A/C
Aug 02, 2006 (12:47 pm)
I'll take another look behind the glove box. When I looked the first time, I saw only the two vacuum actuators for the vents, and they work.
#2568 of 3676 Blazer Air conditioning cold-hot-cold
Aug 02, 2006 (4:07 pm)
The air conditioner in my 1998 Blazer all of a sudden stopped working at the beginning of the season. I checked the freon and it was where it was supposed to be. Suddenly it started working again. Now it's developed a mind of it's own. It will blow cold air for a while and suddenly stop and start blowing hot air. Then after a period of time it will start to blow cool air again. Anyone have any ideas?
#2569 of 3676 Re: Blazer Air conditioning cold-hot-cold [efk4755]
Aug 03, 2006 (1:56 am)
Could be the pressure switch, a loose connector (internal the pins can make/break contact) on the pressure switch or right behind the compressor, incorrect 134 level, belt slipping, comp clutch problems, etc. Also if auto climate control an electric blend motor that controls a door to keep the temp at the selected temp - you would have actual temp degrees marked on the control. Possible controls probems also. A vac line from underhood drivers side so check that the line from the intake to the reservior is intact and not rotted out 5/32" small and 7/32" larger.
I check the main things then off to the AC shop which has the correct gauges and tools. Most compressors go around 80-100k if that long - some do better but not in hot climates.
#2570 of 3676 What is wrong with my Blazer?
Aug 03, 2006 (7:44 pm)
I have a 2000 Blazer 4 wheel drive with 126,000 miles. When I go into reverse and apply the brake, the front end would shimmy and shake. It would almost be a grinding feeling. It does not have a problem going forward and braking forward. It drives in reverse normally. It only comes up while braking in reverse. I know it is not the brakes because I just changed them along with the rotors on both sides. I took the tire off and inspect them. It seems to be in good working order. Can somebody tell what is wrong?