Chevy Blazer 4wd Transmission Problems

Question:
My Blazer has push-button 4WD. During normal driving the 2-Hi indicator is lit. However in recent weeks I've noticed that this light in the dash is going off for short periods of time. It eventually comes back on but I'm worried there may be a problem with my transmission or control module. Any ideas what might be causing this? Thanks so much for your help! 1999 Chevy Blazer. Engine size 4.6 liter. Rebuilt transfer case installed in 2007.

Answer:
Well, first off. This would not be a transmission problem. This is only related to the 4 wheel drive Transfer case. There are three common failures. Listed below from most common and inexpensive, to the most expensive...

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1. The actual 4 wheel drive switch in the dash is bad. If the lights are acting up but there is no change in the truck actually being in 2wd or 4wd, then most times it is a faulty switch. This can be purchased anyhere and is quite cheap.

2. The transfer case control module (TCCM) is acting up. This can also cause this lighting problem. It is located under the passenger side of then dash. Have had a few go bad, and also a few go bad because they got water in the electrical connector. Unplug the module and look for green corrosion on the terminals. After repalcement it would need to be programmed.

3. The "Encoder Motor". This usually causes a problem when trying to shift in and out of 4 wheel high or low. A faulty encoder would cause it to not change gears and would also set computer codes in the module. This part is a little more expensive and tricky to replace. The prolem could also just be the sensor on the motor. Electrical testing would be needed to determine that.

Question:
I recently sent in a question but I'm not sure with all the other ones your all getting if you either over looked it or it didn't go through. Anyways, I have the 4L60e transmission in my 1993 Chevy Blazer and its not working very well. I am wondering if there is another transmission that will bolt up to my 4.3L? Someone I know has one out of a 1987 Blazer but I think it is a 2.8L V6 instead of the 4.3L. The bellhousing looks to be similar but was wondering from your experience with transmissions and GM cars if it or another one would bolt up? 1993 Chevy S-10 Blazer Engine 4.3L Vortec. Changed transmission fluid and filter.

Answer:
The older Blazer transmission would not work. Totally different animal. This is not electrnically controlled. You might be able to make it work but you ould need to add a throttle valve cable and bracket and vacuum source for the moduator since your tryck does not use these. Any 4l60-E transmission 4wd will work from a similar truck. Best is to go to the dealer with the VIN number of your truck, and get the part number of the transmission and have them print out the list of years, makes, models that part numbers also goes in. Then you would have a list of vehicles with this transmission. A junkyard can also tell you this information.

1996 chevy blazer. Question = Hot air is coming from the vents when driving even when the power to the heater is off. It is not a lot but the faster I drive the more flow there is.

Answer:
Airflow is normal. The vent system is calibrated to have a certain amount of outside air come in to the cabin. This is a safety feature and mandated by the federal government. Turn the temperature to the coolest setting to get outside air temp. If there is still hot air then the temperature blend door may be stuck and is directing all air through the ehter core..


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