TimberJack Posted January 1, 2020 Share Posted January 1, 2020 2008 Chu, first load of the morning the truck will run hot but cools right back down and after that doesn’t do it for the rest of the day. I’m getting pressure in the tank. I let the truck sit all weekend and on Monday I noticed the water was low. Well it had tons of pressure on it. Once the pressure was released the coolant level came back up. You can start the truck with coolant cap off and give it throttle and the coolant will pull way down and when you let off throttle it comes out like a volcano. cups an injectors were replaced back in June. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/60349-mp8-cooling-problem/ Share on other sites More sharing options...
fjh Posted January 1, 2020 Share Posted January 1, 2020 Have you had the egre cooler replaced at anytime? Quote Link to comment https://www.bigmacktrucks.com/topic/60349-mp8-cooling-problem/#findComment-439170 Share on other sites More sharing options...
TimberJack Posted January 1, 2020 Author Share Posted January 1, 2020 No it’s the original one. I was thinking it could probably be egr or air compressor. Quote Link to comment https://www.bigmacktrucks.com/topic/60349-mp8-cooling-problem/#findComment-439172 Share on other sites More sharing options...
fjh Posted January 1, 2020 Share Posted January 1, 2020 3 hours ago, TimberJack said: No it’s the original one. I was thinking it could probably be egr or air compressor. remove the forward tube on the EGR cooler (quick and easy check ) see if its damp in there! Before chasing the compressor ! Just my opinion! Quote Link to comment https://www.bigmacktrucks.com/topic/60349-mp8-cooling-problem/#findComment-439188 Share on other sites More sharing options...
TimberJack Posted January 2, 2020 Author Share Posted January 2, 2020 Checked the egr it’s dry. I can leave cap off tank while up is at idle an the coolant will be at the top. When you shut the truck off coolant drops below add mark. I clapped lines going to compressor still the same. Quote Link to comment https://www.bigmacktrucks.com/topic/60349-mp8-cooling-problem/#findComment-439242 Share on other sites More sharing options...
fjh Posted January 2, 2020 Share Posted January 2, 2020 (edited) 11 minutes ago, TimberJack said: Checked the egr it’s dry. I can leave cap off tank while up is at idle an the coolant will be at the top. When you shut the truck off coolant drops below add mark. I clapped lines going to compressor still the same. Kind of an odd issue !These have had water pump impeller issues before! Might be worth a stab in the dark to replace the water pump! Just a thought! Also when the cups were replaced did they do the stat?If the coolant gets contaminated by fuel it ruins All the orings on the coolant side of the engine pretty much! Edited January 2, 2020 by fjh Quote Link to comment https://www.bigmacktrucks.com/topic/60349-mp8-cooling-problem/#findComment-439244 Share on other sites More sharing options...
TimberJack Posted January 3, 2020 Author Share Posted January 3, 2020 I’m not sure if that did or not. Quote Link to comment https://www.bigmacktrucks.com/topic/60349-mp8-cooling-problem/#findComment-439284 Share on other sites More sharing options...
TimberJack Posted January 6, 2020 Author Share Posted January 6, 2020 Changed the thermostat and problem solved! Thanks FJH. Quote Link to comment https://www.bigmacktrucks.com/topic/60349-mp8-cooling-problem/#findComment-439581 Share on other sites More sharing options...
fjh Posted January 6, 2020 Share Posted January 6, 2020 14 hours ago, TimberJack said: Changed the thermostat and problem solved! Thanks FJH. GOOD JOB! Quote Link to comment https://www.bigmacktrucks.com/topic/60349-mp8-cooling-problem/#findComment-439635 Share on other sites More sharing options...
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