HI Guy and Ladys. I have a 2000 Chevy Blazer 2wd LT. I have code po401 and i have replaced the EGR and need to clean the tubeing that is below it ,I have tryed Carb cleaner and the code came back. so does anyone have any place to get a small brush to clean this?the second thing is the heat and ac go on and off all the time . heat then click then cool then click then cool. theclick is the door motor behind the glove box. if i change it is there anything that can also make this happen?and last my on star wont work. the green light comes on but if you push any of the buttons nothing happens. if you have any info for me on any of this pleas chime in. thanks for al of your help garry.

 

If P0401 is the ONLY Diagnostic Trouble Code, (DTC) retrieved, follow this flow chart:

https://blazerforum.com/forum/diagno...plained-38683/

If other DTC's are present, they must be diagnosed and repaired first.

 

thanks my tube going to the maniflod is no putting out any thing but the intake is sucking like a shop vac. i am going to try and get a brush to push down the tube and clean it out ,as two cans of carb cleaner hasnt gotten it yet.