Crispy2k10 Posted May 24, 2017 Share Posted May 24, 2017 I have a 1992 Mack cab over truck with an E7 motor. It is used in a feed mixer to feed dairy cows daily. This truck runs hot, 200-215 on a 65 degree day. The fan is an air over electric I believe, and only blows are out the front of the truck, there is a button to change the fins so that it will pull air in but it only works for maybe 5 seconds when u push it. The fan also sits back about 2 feet from the radiator. Does anyone have any suggestions on what I should check to get this thing running cooler? We had a 80 degree day here in NY a while back and the truck wouldnt cool below 205 unless it idled for 40 minutes. Quote Link to comment https://www.bigmacktrucks.com/topic/49956-1992-mack-always-runs-hot/ Share on other sites More sharing options...
TeamsterGrrrl Posted May 24, 2017 Share Posted May 24, 2017 Is this engine in an MR chassis? Perhaps a former Postal Service tractor? Quote Link to comment https://www.bigmacktrucks.com/topic/49956-1992-mack-always-runs-hot/#findComment-370639 Share on other sites More sharing options...
Crispy2k10 Posted May 24, 2017 Author Share Posted May 24, 2017 I found out today that the truck had a Cleanfix cooling fan system on it. I contacted Cleanfix and a tech there told me that the fan was set up backwards and is not pulling air into the radiator but blowing the hot air out the front of the truck. I hope that with some more help from them that I can correct the problem soon. Quote Link to comment https://www.bigmacktrucks.com/topic/49956-1992-mack-always-runs-hot/#findComment-370646 Share on other sites More sharing options...
Okiki Olufokunbi Posted June 8, 2017 Share Posted June 8, 2017 On 5/24/2017 at 2:37 PM, Crispy2k10 said: I found out today that the truck had a Cleanfix cooling fan system on it. I contacted Cleanfix and a tech there told me that the fan was set up backwards and is not pulling air into the radiator but blowing the hot air out the front of the truck. I hope that with some more help from them that I can correct the problem soon. Did the discovery and fix solve the problem? Quote Link to comment https://www.bigmacktrucks.com/topic/49956-1992-mack-always-runs-hot/#findComment-371811 Share on other sites More sharing options...
Mack Technician Posted June 8, 2017 Share Posted June 8, 2017 Try to find a fixed (vs. variable) displacement fan. Life is too short for high tech '92. It sits back 2 feet....better have a cowl. Quote Link to comment https://www.bigmacktrucks.com/topic/49956-1992-mack-always-runs-hot/#findComment-371816 Share on other sites More sharing options...
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