Palisade41 Posted August 24, 2021 Share Posted August 24, 2021 I can't figure out how to open up the "blinds" shutters. on my radiator. They are closed and I keep overheating. No air flow going through the radiator. Can't figure out how they are actuated. Help please. Quote Link to comment https://www.bigmacktrucks.com/topic/67827-1975-mack-cf-600-radiator-blinds/ Share on other sites More sharing options...
mowerman Posted August 24, 2021 Share Posted August 24, 2021 There are two parts air activated ram on top of shutters disconnect it for now till you find parts it’s probably faulty shutter Thermostat connected to engine I try to send you photos but I am unable to good luck… bob Quote Link to comment https://www.bigmacktrucks.com/topic/67827-1975-mack-cf-600-radiator-blinds/#findComment-478840 Share on other sites More sharing options...
Freightrain Posted August 24, 2021 Share Posted August 24, 2021 They SHOULD be sprung in the open position. Any time there is NO air in the system, they should be open. No questions. The Shutterstat that is mounted in the water manifold gives the air to the shutters to close when the engine is cool. Sounds like someone swapped the spring around and has it pulling closed. 1 Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/67827-1975-mack-cf-600-radiator-blinds/#findComment-478846 Share on other sites More sharing options...
63BMack Posted August 24, 2021 Share Posted August 24, 2021 On my 72 R model it has an air valve that you can turn the air off which opens the shutters. Follow the airline from the shutterstat it should lead to a shutoff valve. Quote Link to comment https://www.bigmacktrucks.com/topic/67827-1975-mack-cf-600-radiator-blinds/#findComment-478849 Share on other sites More sharing options...
Popular Post Freightrain Posted August 25, 2021 Popular Post Share Posted August 25, 2021 The air supply should close the shutters, not open them. The default should be always open to eliminate any problems should the shutterstat fail. 3 Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/67827-1975-mack-cf-600-radiator-blinds/#findComment-478881 Share on other sites More sharing options...
mowerman Posted August 25, 2021 Share Posted August 25, 2021 Aaaaaaaaaah hell,, I didn’t even know that I’ve had my DM 27 years but they have been stuck open The entire time Truck had a small front end collision and bent the shutters I have a new set I will be using but I have seen the ram trying to close them and open them before while it was running So I’m pretty sure though shutters stat still works I don’t even know if you can still buy them… bob Quote Link to comment https://www.bigmacktrucks.com/topic/67827-1975-mack-cf-600-radiator-blinds/#findComment-478886 Share on other sites More sharing options...
Freightrain Posted August 25, 2021 Share Posted August 25, 2021 I do know if you put the air into the shutterstat backwards it will close the shutters and not exhaust the air to open them(been there). When I out the stat in the 237 I screwed up and didnt pay attention to the "in" and "out" markings. First trip out it started to overheat, so I removed the airline to the stat and they opened. That is when I realized it was plumbed wrong. I tightened the stat another 1/2 turn and the air hooked up correctly and worked fine. 2 Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/67827-1975-mack-cf-600-radiator-blinds/#findComment-478907 Share on other sites More sharing options...
85snowdog Posted August 25, 2021 Share Posted August 25, 2021 Not sure if this helps , But here is what the shutter stat looks like . And like Larry said , it has an in and out on it . I posted the box for a part #. Its a Mack # but they always seem to cross it over for me at Mack/Volvo . 1 Quote Keith Link to comment https://www.bigmacktrucks.com/topic/67827-1975-mack-cf-600-radiator-blinds/#findComment-478924 Share on other sites More sharing options...
Brocky Posted August 26, 2021 Share Posted August 26, 2021 Or look for the spring which holds them open.. Possibly broken??? Or rusted shut??? 2 Quote Brocky Link to comment https://www.bigmacktrucks.com/topic/67827-1975-mack-cf-600-radiator-blinds/#findComment-478930 Share on other sites More sharing options...
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