03 Trailblazer Cluster Problems

[Volphin]

Hi everyone, new here...

I'm trying to fix my brother's 03 Trailblazer for him. I'm pretty handy with a wrench, but am very unfamiliar with this TB platform.

Here are the issues I need to tackle.

1) Voltmeter is inoperative and points straight down. Oil pressure is pegged at max.
I have been reading here that these may be the stepper motors within the cluster.
Are these easy to replace? Anyone have a link to the procedure?

2) Funny thudding noises coming from the upper dash when changing airflow modes on the HVAC.
From reading here, I learned that it is most likely a mode door actuator, and have found a procedure.
How do you know what part number you need and where to you guys get your parts?

Thanks!

V

 

[The_Roadie]

Many issues have already been covered by our How-to articles.

1) GMTNation - How to change a stepper motor

2) I've been posting this graphic for years. Parts can be obtained at your local parts stores using the GM number and their look-up software, or Ebay, Rockauto, Amazon, or for GM-only parts, one of the discount GM parts distribution channels like parts4chevys.com or gmpartsdirect.com

 

[Volphin]

Many issues have already been covered by our How-to articles.

1) GMTNation - How to change a stepper motor

2) I've been posting this graphic for years. Parts can be obtained at your local parts stores using the GM number and their look-up software, or Ebay, Rockauto, Amazon, or for GM-only parts, one of the discount GM parts distribution channels like parts4chevys.com or gmpartsdirect.com

Thanks Roadie. I have removed the cluster and parts are on the way. The oil pressure sending unit is probably shot for the oil gauge inconsistency, and will be changing it as well.

I also have the lower dash disassembled and unplugged the mode door actuator. Just for giggles I tried swiching modes while it was unplugged. I still get that odd thudding noise. Could it be another one? Or is the airflow itself flapping the door making the noise?

Thanks!

V

 

[Volphin]

Thanks for the assist Roadie! Cluster is out and I am waiting on parts.

I now have access to the HVAC actuators as well.

I was pretty sure it was the mode actuator... but now I'm not so sure. I unplugged it and the noise was still present. Could it be the defrost actuator instead? Or is the fan airflow flapping around a disconnected door? (Highly unlikely as the modes are changing...)??