Etu Posted October 16, 2021 Share Posted October 16, 2021 I have a “new to me” 2001 CH613 with little to no air flow from the ac vents. I cannot find any info on replacing cabin air filter or cleaning the evaporator coil. I’ve removed the cowl around the console and can see the fan but don’t know where to look next. Any advice will be greatly appreciated. Thanks Quote Link to comment https://www.bigmacktrucks.com/topic/68494-2001-ch613-cabin-ac/ Share on other sites More sharing options...
Joey Mack Posted October 16, 2021 Share Posted October 16, 2021 there isnt a filter... pull the lower center panel below the hvac controls, and loosen the plastic duct that goes into it from the right side.... what i do is, make a cardboard tube and tape it to my shop vac, then flatten the tube so it fits in the small gap you create by loosening the big plastic duct.. then suck the mud out of the a/c core.... ive done so many , i get this done in less than 30 minutes... jojo 1 Quote Link to comment https://www.bigmacktrucks.com/topic/68494-2001-ch613-cabin-ac/#findComment-481450 Share on other sites More sharing options...
Etu Posted October 17, 2021 Author Share Posted October 17, 2021 Thank you. I'll do that. Quote Link to comment https://www.bigmacktrucks.com/topic/68494-2001-ch613-cabin-ac/#findComment-481452 Share on other sites More sharing options...
Etu Posted October 17, 2021 Author Share Posted October 17, 2021 Is there's any benefit to pull the fan to access that side of the evaporator coil? Quote Link to comment https://www.bigmacktrucks.com/topic/68494-2001-ch613-cabin-ac/#findComment-481454 Share on other sites More sharing options...
Joey Mack Posted October 17, 2021 Share Posted October 17, 2021 Isnt the fan on the left side of the evap and heater core I think it pulls air through the cores. if so, the fan assembly slides out for servicing. for some reason I cant picture it correctly in my mind.... sorry, it's been a while and don't remember. so as far as pulling the fan, only if its dirty... Jojo Quote Link to comment https://www.bigmacktrucks.com/topic/68494-2001-ch613-cabin-ac/#findComment-481475 Share on other sites More sharing options...
Etu Posted October 17, 2021 Author Share Posted October 17, 2021 Thanks. I'll report back what I find after I do what you advised. Quote Link to comment https://www.bigmacktrucks.com/topic/68494-2001-ch613-cabin-ac/#findComment-481489 Share on other sites More sharing options...
Etu Posted October 18, 2021 Author Share Posted October 18, 2021 Ok I pulled the air duct on the right side and the core was very dirty. Vacuumed it clean and also pulled the fan on left side. Used compressed air to blow through core from the fan side. When I pulled the fan there was a blue filter between the fan and the coil. Not sure what benefit of a filter on the clean side of the core. Also think the air doors are not diverting air correctly. Going to check that out before I reassemble. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/68494-2001-ch613-cabin-ac/#findComment-481518 Share on other sites More sharing options...
Vmac3 Posted October 20, 2021 Share Posted October 20, 2021 What you are speaking of is called a "Mode Box". I think you are correct in suggesting that the air direction flaps are the issue. Those were very prone to seizing. V 1 Quote Link to comment https://www.bigmacktrucks.com/topic/68494-2001-ch613-cabin-ac/#findComment-481601 Share on other sites More sharing options...
Etu Posted October 21, 2021 Author Share Posted October 21, 2021 Thanks V, after cleaning ive got much better air fłów but i cannot get The modę box to divert air to the defrost or floor. Right nów it seems to be stuck on a mix of face vents and floor. Mine has the electric switch to select mode and I'm not sure where to go from here. (Is it the switch or the mode box?) If it's the mode box how do you get to it? Quote Link to comment https://www.bigmacktrucks.com/topic/68494-2001-ch613-cabin-ac/#findComment-481674 Share on other sites More sharing options...
Joey Mack Posted October 21, 2021 Share Posted October 21, 2021 "V" may have nailed it... I/We have done a bunch of these repairs... there is a service buliten may go back to around 2002.. if you get a copy it wll guide you and provide the parts list... it's a bit of a job but the out come is good... jojo Quote Link to comment https://www.bigmacktrucks.com/topic/68494-2001-ch613-cabin-ac/#findComment-481677 Share on other sites More sharing options...
Etu Posted October 23, 2021 Author Share Posted October 23, 2021 (edited) Thanks Jojo. Where would I look for that service bulletin.. on this site? Or through Mack? thanks for the lead. I found a listing of Mack SB and I believe the one I'm looking for is SB635008 but I can't seem to access a copy. Edited October 23, 2021 by Etu Quote Link to comment https://www.bigmacktrucks.com/topic/68494-2001-ch613-cabin-ac/#findComment-481738 Share on other sites More sharing options...
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