David Brown Posted June 19, 2018 Share Posted June 19, 2018 Has anyone removed a radiator from a Mack CF 688 FC fire truck? It has a E6 350 Turbocharged engine. When it idles the temp range is around 180 degrees when I run it on the road the temp jumps to 230 degrees. I have check it with a IFR gun and it's correct. Coolant looks good the fan turns. It's so hot you can hardly seat in a jump seat next to the dog house. Any advise. Quote Link to comment https://www.bigmacktrucks.com/topic/53597-radiator-removal-from-a-89-mack-cf-688-fc/ Share on other sites More sharing options...
fjh Posted June 19, 2018 Share Posted June 19, 2018 Check fan the hub just cause it’s turning don’t mean it’s working Quote Link to comment https://www.bigmacktrucks.com/topic/53597-radiator-removal-from-a-89-mack-cf-688-fc/#findComment-400813 Share on other sites More sharing options...
h67st Posted June 19, 2018 Share Posted June 19, 2018 Also make sure your thermostat is good and the water pump is circulating correctly. Quote Link to comment https://www.bigmacktrucks.com/topic/53597-radiator-removal-from-a-89-mack-cf-688-fc/#findComment-400827 Share on other sites More sharing options...
RobM626 Posted June 19, 2018 Share Posted June 19, 2018 It’s probably the simplest possibility but try blowing out the fins and hosing it with water after. They rad could be plugged.That happened to a few of our trucks and they ran 20-30 degrees cooler after 1 Quote Link to comment https://www.bigmacktrucks.com/topic/53597-radiator-removal-from-a-89-mack-cf-688-fc/#findComment-400838 Share on other sites More sharing options...
Hobert62 Posted June 20, 2018 Share Posted June 20, 2018 20 hours ago, RobM626 said: It’s probably the simplest possibility but try blowing out the fins and hosing it with water after. They rad could be plugged.That happened to a few of our trucks and they ran 20-30 degrees cooler after Could be that simple, I did that to my kubota tractor about a week ago with the same result. Except I used shop air. Quote Link to comment https://www.bigmacktrucks.com/topic/53597-radiator-removal-from-a-89-mack-cf-688-fc/#findComment-400905 Share on other sites More sharing options...
RobM626 Posted June 20, 2018 Share Posted June 20, 2018 3 hours ago, Hobert62 said: Could be that simple, I did that to my kubota tractor about a week ago with the same result. Except I used shop air. Yea I use air first to blow as much as I can out so the water doesn’t make it like concrete. The best way to do it I found to be taking off intercooler so you can clean everything nice without damaging the fins Quote Link to comment https://www.bigmacktrucks.com/topic/53597-radiator-removal-from-a-89-mack-cf-688-fc/#findComment-400920 Share on other sites More sharing options...
TAB Posted August 25, 2022 Share Posted August 25, 2022 Having same issue with 81 CF 688. Did blowing out the fins resolve your overheating issue? Quote Link to comment https://www.bigmacktrucks.com/topic/53597-radiator-removal-from-a-89-mack-cf-688-fc/#findComment-507480 Share on other sites More sharing options...
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