GPWS Posted July 1, 2017 Share Posted July 1, 2017 i am have a problem with 2000 RD 690 overheating We installed new water pump and fan clutch. thermostat- ran good for a few days then it overheated We blew out radiator, inter cooler, changed all sensors on manilfold, new gauges inside the truck radiator reading 190 on top 170 on bottom when it overheats It will run fine for a few hrs then overheats and seems to overheat when we go up a hill Any input?? Quote Link to comment https://www.bigmacktrucks.com/topic/50347-overheating-issue/ Share on other sites More sharing options...
0 Lmackattack Posted July 2, 2017 Share Posted July 2, 2017 sounds like a sticking thermostat? 1 Quote Link to comment https://www.bigmacktrucks.com/topic/50347-overheating-issue/#findComment-373939 Share on other sites More sharing options...
0 stuie56 Posted July 2, 2017 Share Posted July 2, 2017 make sure the clutch fan is working. i have had a few of these fail very quickly,, at 180.00 a pop. finally eliminated it no more problems. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/50347-overheating-issue/#findComment-373953 Share on other sites More sharing options...
0 mrgumby Posted July 2, 2017 Share Posted July 2, 2017 check your upper and lower hoses I have seen them collapse internally..and drive people crazy trying to figure the over heating out..just a thought 1 Quote Link to comment https://www.bigmacktrucks.com/topic/50347-overheating-issue/#findComment-373969 Share on other sites More sharing options...
0 DJG Posted July 5, 2017 Share Posted July 5, 2017 Does it have an water type oil cooler if so check to see if that is plugged I had one once on cat motor that drove me nuts once I boiled it out it ran nice an cool Quote Link to comment https://www.bigmacktrucks.com/topic/50347-overheating-issue/#findComment-374178 Share on other sites More sharing options...
0 Mack Technician Posted July 5, 2017 Share Posted July 5, 2017 I had a Mack 6X6 DMM that overheated like that despite replacing all the usual suspects. I took the radiator to the repair shop to have it checked for congestion. They popped the tanks and attempted to rod out the core. The core had a soild center in the exact shape of the fan. It was a circle of scale occupying a round portion of the core. New core and problem fixed. Quote Link to comment https://www.bigmacktrucks.com/topic/50347-overheating-issue/#findComment-374182 Share on other sites More sharing options...
Question
GPWS
i am have a problem with 2000 RD 690 overheating
We installed new water pump and fan clutch. thermostat- ran good for a few days then it overheated
We blew out radiator, inter cooler, changed all sensors on manilfold, new gauges inside the truck
radiator reading 190 on top 170 on bottom when it overheats
It will run fine for a few hrs then overheats and seems to overheat when we go up a hill Any input??
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https://www.bigmacktrucks.com/topic/50347-overheating-issue/Share on other sites
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