| ID | Status | Date | Year | Make | Model | Transmission Type | A/C Controls | Public/Private |
|---|---|---|---|---|---|---|---|---|
| #15537 | Closed | 2004 | Chevy | Suburban | public |
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I have a 2004 Suburban Z71 4wd automatic HVAC system problem. The original problem I went after was the common hot air on the passenger side issue. I bought 3 new actuators part number 604-106 which it said is a replacement for the (3) 52402588 actuators on the passenger side. I figured if I was already in there I would just replace all 3. I put the new ones in and did the recalibration procedure… “put it in auto mode, pull fuse, wait 2 min, replace fuse, start/run for 2 min, turn off for 10-30 seconds.” Everything worked except for the recirculation door that closed and never cycled through its range. I performed the recal procedure more times and unhooked battery, waited longer, pulled the side panel AC fuse, idled 5 minutes, drove over 45 mph, etc. Nothing works. I then questioned if the actuators were even the issue so I did the 9 volt battery re-center method on the ones I took out and then just plugged them into the truck hanging free to watch them go through the range calibration. They all work except for the recirculate actuator that always closes and wont reopen. I can use the 9 volt battery to operate the old and new actuators perfectly, its just when its plugged into the wiring that it closes and wont open. I removed the automatic control panel and looked it over inside and out. Aside from most of the backlight bulbs not working it all looked brand new. My next approach was going to check the wiring and check voltage, which is when I found your website. Any ideas? |
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It would be best to use the correct scan tool at this point to continue diagnostics. I understand that most people don’t have access to these tools and will make some other recommendations. Since you understand how te actuators work you will want to use the information in the following article to move the stuck actuator back and forth. Check the position signal circuit with a voltmeter to see if it responds properly. You can also monitor the command signal circuit. Test the command signal during and after the recalibration process. Since you will be jumping to it to move the actuator you will not need to test during that operation. Write down the position signal voltage at the fully open and fully closed positions. I will see if I can take those voltage readings and convert them into command counts. What may be happening is a software issue. You may notice wear (compression or missing pieces) in the foam surface on the fresh air door. GM did not allow for that wear in the original software and if the actuator travels beyond its design limits the control panel can no longer move the actuator. The only way to find out if it has updated software is to use a compatible scan tool and check the software version.
https://sparkys-answers.com/2013/08/2003-chevrolet-silverado-hvac-actuator.html |