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I need some assistance with an A/C system for a mack 2008


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i need some help! I need to know about how the electronic system of a mack 2008 Works, I have not being able to get the fan clutch to work whenever I turn the A/C on. Every time I turn the A/C on, the A/C system pressure goes all the way up to 300psi because of the fan cluth not working, I will appreciate any type of advice.

thanks in advance.

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Do you have an APADS on this truck? What is the ambient air temp? Does the A/C blow cold? Could be the high pressure fan switch with or without APADS. if you have APADS could still be the high pressure fan switch or the APADS unit its self. The best way is to use VCADS and monitor the high pressure fan switch.

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