Zeuz Posted August 7, 2022 Share Posted August 7, 2022 Have a 2011 mack with a MP8. The ac was cooling while u was moving on the highway.but idling it won't cool blows hot..it just went out today doesn't cool at all..the engine fan comes on at 205 degrees but i don't hear it coming on while idle..i wired the high pressure switch straight but u hear it click at the fan but it won't engage .it's a cool logic cooling fan ..wondering if it's the ac or the cooling fan or both..thanks Quote Link to comment https://www.bigmacktrucks.com/topic/70241-cooling-fan/ Share on other sites More sharing options...
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