JNabozny Posted January 26 Share Posted January 26 Does anyone have the 2 heater knobs for the 2 levers on the heater controls? Or know where I can get them? Thank you Quote Link to comment https://www.bigmacktrucks.com/topic/76354-79-r-model-heater-knobs/ Share on other sites More sharing options...
Brocky Posted January 26 Share Posted January 26 Have you tried Barry at Watts Truck??? 888-304-6225 Quote Brocky Link to comment https://www.bigmacktrucks.com/topic/76354-79-r-model-heater-knobs/#findComment-589950 Share on other sites More sharing options...
JNabozny Posted January 26 Author Share Posted January 26 I looked on the website, but I’ll call them tomorrow. Thank you Quote Link to comment https://www.bigmacktrucks.com/topic/76354-79-r-model-heater-knobs/#findComment-589953 Share on other sites More sharing options...
kscarbel2 Posted January 26 Share Posted January 26 1 hour ago, JNabozny said: Does anyone have the 2 heater knobs for the 2 levers on the heater controls? Or know where I can get them? Thank you Is the unit an Evans or Red Dot ? 1 Quote Link to comment https://www.bigmacktrucks.com/topic/76354-79-r-model-heater-knobs/#findComment-589954 Share on other sites More sharing options...
JNabozny Posted January 27 Author Share Posted January 27 On 1/25/2026 at 9:39 PM, kscarbel2 said: Is the unit an Evans or Red Dot ? That’s a great question lol. Quote Link to comment https://www.bigmacktrucks.com/topic/76354-79-r-model-heater-knobs/#findComment-590112 Share on other sites More sharing options...
kscarbel2 Posted January 27 Share Posted January 27 15 minutes ago, JNabozny said: That’s a great question lol. That's an Evans. I'm sorry, I can't remember the 2790-HVxxxxxx part-number for the slider knobs. Red Dot has a similar knob, RD544500, but of course I'd rather look up the truck by model and serial, get the 2RD heater assembly number and grab the correct 2790- knob number from that breakdown and supercede forward from there. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/76354-79-r-model-heater-knobs/#findComment-590116 Share on other sites More sharing options...
Vladislav Posted January 28 Share Posted January 28 20 hours ago, kscarbel2 said: That's an Evans. I'm sorry, I can't remember the 2790-HVxxxxxx part-number for the slider knobs. Red Dot has a similar knob, RD544500, but of course I'd rather look up the truck by model and serial, get the 2RD heater assembly number and grab the correct 2790- knob number from that breakdown and supercede forward from there. Kevin, sorry to bother. Is that RD544500 Red Dot knob fit to the temp control levers (as on the above pic) or on the small blower control lever too? Quote Никогда не бывает слишком много грузовиков! leversole 11.2012 Link to comment https://www.bigmacktrucks.com/topic/76354-79-r-model-heater-knobs/#findComment-590181 Share on other sites More sharing options...
kscarbel2 Posted January 28 Share Posted January 28 22 minutes ago, Vladislav said: Kevin, sorry to bother. Is that RD544500 Red Dot knob fit to the temp control levers (as on the above pic) or on the small blower control lever too? For example, they fit the slide levers on a Red Dot unit in an 1990 to 2000 MR. My brain remains full of part numbers, a testament to the superiority of the Mack part system (Mack numbers were not arbitrary like Volvo, rather the part number structure had meanings). But even I can not remember them all, not having used them in years. Quote Link to comment https://www.bigmacktrucks.com/topic/76354-79-r-model-heater-knobs/#findComment-590184 Share on other sites More sharing options...
Vladislav Posted January 28 Share Posted January 28 6 minutes ago, kscarbel2 said: For example, they fit the slide levers on a Red Dot unit in an 1990 to 2000 MR. My brain remains full of part numbers, a testament to the superiority of the Mack part system (Mack numbers were not arbitrary like Volvo, rather the part number structure had meanings). But even I can not remember them all, not having used them in years. Thank you. I've a few those knobs lost off RD heaters in 2 or 3 R/RD-model cabs. And fan switches too. New ones check out cheap. So seems worth to stock up before they're NLA. Yes, Volvo part numbers are blind. And long in digits to remember. I have never had a clue on the actual Mack ## meanings. Would be interesting to investigate the matter but difficult due to limited ability of the parts lists. Quote Никогда не бывает слишком много грузовиков! leversole 11.2012 Link to comment https://www.bigmacktrucks.com/topic/76354-79-r-model-heater-knobs/#findComment-590186 Share on other sites More sharing options...
JNabozny Posted Monday at 01:37 PM Author Share Posted Monday at 01:37 PM On 1/27/2026 at 6:26 PM, kscarbel2 said: That's an Evans. I'm sorry, I can't remember the 2790-HVxxxxxx part-number for the slider knobs. Red Dot has a similar knob, RD544500, but of course I'd rather look up the truck by model and serial, get the 2RD heater assembly number and grab the correct 2790- knob number from that breakdown and supercede forward from there. Thank you for the information, I appreciate it. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/76354-79-r-model-heater-knobs/#findComment-590508 Share on other sites More sharing options...
D2Denny Posted 3 hours ago Share Posted 3 hours ago Help will be on the way soon for some of these parts. I received a 3D printer for Xmas and have been learning it and cad over the last month. (The last mechanical drawing I did was 60 years ago in engineering class using a drawing board, T square, triangles, and French curves). Looked up the knob you were searching for and drew up a quickie just approximating the size and shape and printed it off. Obviously, it needs to be refined but could be done with some extra cad work that I still have to learn. Also downloaded a file and printed a Mack Bulldog (opposite a gennie long eared dog). I did design and print a Model A Ford door lock knob and door handle mounting pad for my A V8 hot rod, so am moving into a whole new world of generating your own parts at home, Quote Link to comment https://www.bigmacktrucks.com/topic/76354-79-r-model-heater-knobs/#findComment-590591 Share on other sites More sharing options...
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