Mr Large Posted November 22, 2019 Share Posted November 22, 2019 Air from the engine compartment is entering the cab, cold in winter/hit in summer. Where would I start? Are there any common failures and how would I best access the firewall ? Quote Link to comment https://www.bigmacktrucks.com/topic/59921-ch613-cold-air-leaking-through-firewall/ Share on other sites More sharing options...
alex g Posted November 22, 2019 Share Posted November 22, 2019 Check boot on steering shaft 1 Quote Link to comment https://www.bigmacktrucks.com/topic/59921-ch613-cold-air-leaking-through-firewall/#findComment-436456 Share on other sites More sharing options...
Mr Large Posted November 23, 2019 Author Share Posted November 23, 2019 Well, I guess I should have been more specific. I was only thinking about the section behind the center console as the fire wall. Air is flowing from behind the center console and seems concentrated on the floor and behind what I assume is the hvac manifold/fresh air intake located on the passenger side of the console. I've looked from both compartments, using a light source and looking for any rays shining through until other side. No luck. Quote Link to comment https://www.bigmacktrucks.com/topic/59921-ch613-cold-air-leaking-through-firewall/#findComment-436474 Share on other sites More sharing options...
alex g Posted November 23, 2019 Share Posted November 23, 2019 Sounds like you have a flap stuck open in your heater. When you run heat controls can you hear anything moving inside? Quote Link to comment https://www.bigmacktrucks.com/topic/59921-ch613-cold-air-leaking-through-firewall/#findComment-436477 Share on other sites More sharing options...
dexter860 Posted December 19, 2019 Share Posted December 19, 2019 mine does same thing. Quote Link to comment https://www.bigmacktrucks.com/topic/59921-ch613-cold-air-leaking-through-firewall/#findComment-438346 Share on other sites More sharing options...
880joe Posted December 19, 2019 Share Posted December 19, 2019 All my CH's do that also I was hoping someone on here had a cure for it. Quote Link to comment https://www.bigmacktrucks.com/topic/59921-ch613-cold-air-leaking-through-firewall/#findComment-438350 Share on other sites More sharing options...
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