Jump to content
Sign in to follow this  
bulldogfan

A/C Explosion!

Recommended Posts

Have an 07 mack with the APADS controller.

A/c works perfectly, until you come to a stop. Then the problem starts.

The engine fan is not coming on. Therefore the high side pressure skyrockets, until the drier pressure relief valve opens.

Wow, what a racket that makes!   So, I replaced the high side pressure switch and the relay mounted to the apads box.

No, difference.    So, my question is do these boxes fail?   Also, the orange wire coming out of controller is the fan wire. I am not getting any voltage on this wire, even when high side pressure is over 400 psi?    What tells the fan to come on?  I can get fan to engage if I disconnect the relay, of some of the other connectors nearby.        So...............

Share this post


Link to post
Share on other sites

I don't know anything about the APADS, but I figured the compressor would kick off before the pressure got that high.

Share this post


Link to post
Share on other sites

Same on APADS experience but could be solved by connecting the high pressure sensor to a separate relay to switch the fan. A kind of a lame customizing but would fix the problem.


Никогда не бывает слишком много грузовиков! leversole 11.2012

Share this post


Link to post
Share on other sites
Posted (edited)

https://www.indexsensors.com/pdfs/apads_faqs.pdf

 

The boxes do fail

Section D is fan control info  about diagnosing the box

Gives diagnostics, blink codes and such.

Edited by 41chevy

“Life’s journey is not to arrive at the grave safely, in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘Holy shit, what a ride!’”

P.T.CHESHIRE

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this  

  • Recently Browsing   0 members

    No registered users viewing this page.

×
×
  • Create New...

Important Information

We have placed cookies on your device to help customize your user experience here on BMT. You can adjust your cookie settings to your preferences if you like, otherwise we'll assume that you're okay to continue.