68-f-model Posted September 3, 2015 Share Posted September 3, 2015 Replacing the water pump on my f model with a 237 . I pull the thermostat and head to Napa and all I get are blank stares back when they try looking it up in the books. There are no numbers on my old one to compare to. Can any of you guys recall what the part number I need is?Also possibly a part number for this hose as I am pretty sure the universal hose that was on it isn't right. Quote Link to comment https://www.bigmacktrucks.com/topic/41621-mack-thermostat-part-number/ Share on other sites More sharing options...
j hancock Posted September 3, 2015 Share Posted September 3, 2015 Six Cylinder Pre ESI Mack Part numbers215SB 164P1 155 degree215SB 164P2 170 degree215SB 164P3 180 degreeSix Cylinder ESI Extended Service215SB 165P1 155215SB 165P2 170215SB 165P3 180Don't have an OEM number for the hose.Hose looks universal and NAPA should be able to help you. They may have to order from their warehouse if both ends aren't the same diameter. Horrors... they might have to look in their hose and belt catalog. 2 Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/41621-mack-thermostat-part-number/#findComment-302463 Share on other sites More sharing options...
68-f-model Posted September 3, 2015 Author Share Posted September 3, 2015 What is the difference in the ESI and Pre ESI thermostats? Quote Link to comment https://www.bigmacktrucks.com/topic/41621-mack-thermostat-part-number/#findComment-302472 Share on other sites More sharing options...
j hancock Posted September 3, 2015 Share Posted September 3, 2015 An ESI thermostat is a smaller diameter and different design.Your thermostat is a pre-ESI by the looks of it. You should have three bolts at the thermostat housing. Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/41621-mack-thermostat-part-number/#findComment-302475 Share on other sites More sharing options...
68-f-model Posted September 3, 2015 Author Share Posted September 3, 2015 I think that the 215sb 164p3 180 degree crosses over to a NAPA 353-180 part. We shall see if I am right as they are shipping one in for me to compare. Quote Link to comment https://www.bigmacktrucks.com/topic/41621-mack-thermostat-part-number/#findComment-302480 Share on other sites More sharing options...
HarryS Posted September 3, 2015 Share Posted September 3, 2015 I have a Mack thermostat part #215 SB 164 AP3 in the box. It looks like the NAPA one pictured. I got it from Watt's for a 673 B Model and then found out my truck doesn't have a thermostat, just shutters. I can't find the invoice but will sell it cheap. Quote Link to comment https://www.bigmacktrucks.com/topic/41621-mack-thermostat-part-number/#findComment-302489 Share on other sites More sharing options...
41chevy Posted September 3, 2015 Share Posted September 3, 2015 On 9/3/2015 at 3:30 PM, HarryS said: I have a Mack thermostat part #215 SB 164 AP3 in the box. It looks like the NAPA one pictured. I got it from Watt's for a 673 B Model and then found out my truck doesn't have a thermostat, just shutters. I can't find the invoice but will sell it cheap. https://wattstruckcenter.com/shop/180-deg-thermostat Quote "OPERTUNITY IS MISSED BY MOST PEOPLE BECAUSE IT IS DRESSED IN OVERALLS AND LOOKS LIKE WORK" Thomas Edison “Life’s journey is not to arrive at the grave safely, in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘Holy shit, what a ride!’” P.T.CHESHIRE Link to comment https://www.bigmacktrucks.com/topic/41621-mack-thermostat-part-number/#findComment-302493 Share on other sites More sharing options...
HarryS Posted September 3, 2015 Share Posted September 3, 2015 That's it, thanks. I'll take $60 and mail it anywhere in US. Quote Link to comment https://www.bigmacktrucks.com/topic/41621-mack-thermostat-part-number/#findComment-302503 Share on other sites More sharing options...
Bobby j Posted September 3, 2015 Share Posted September 3, 2015 The small 's' shaped hose I just put on my b-model along with new water pump. Pai still carries the hose the part number on my receipt is Mac 8651......not sure if this is company's or pai's part number......also if anybody needs water pump pai also carries NEW not rebuilt water pumps........Bobby j. Quote Link to comment https://www.bigmacktrucks.com/topic/41621-mack-thermostat-part-number/#findComment-302517 Share on other sites More sharing options...
Full Floater Posted November 18, 2022 Share Posted November 18, 2022 Is there a particular temp that these engines "like" to run at? It's cooling system re-fresh time for me on a Canadian 235 and I want to do the thermostat while im in there. It's in a tow truck that doesn't tow max gvw loads and short trips more then long trips so im thinking a 170 or 180 degree stat 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/41621-mack-thermostat-part-number/#findComment-515430 Share on other sites More sharing options...
fjh Posted November 18, 2022 Share Posted November 18, 2022 yup agree! Quote Link to comment https://www.bigmacktrucks.com/topic/41621-mack-thermostat-part-number/#findComment-515434 Share on other sites More sharing options...
doubleclutchinweasel Posted November 18, 2022 Share Posted November 18, 2022 Diesels like a little heat. Cold diesels tend to build up crud. I think mine was a 170° thermostat, but the shutters controlled the heat from there to...I want to say...190°? I can't remember exactly. There are people on here that will remember those numbers in detail. I HAVE seen trucks with the shutters deactivated run a 180 or even 185° thermostat with no reported issues. Again, there are real pros on here that can guide you way better than I can! Quote "Eagles may soar, but weasels don't get sucked into jet engines." Link to comment https://www.bigmacktrucks.com/topic/41621-mack-thermostat-part-number/#findComment-515446 Share on other sites More sharing options...
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