mack88 Posted July 12, 2020 Share Posted July 12, 2020 My 87 E6 350 was pushing coolant out the over flow tube replaced air compressor last winter had heads redone with injectors i can let it idle all day wont do it but just when driving it its not much but enough to dampen the front wheel axle on the one side where the tube hangs down from the rad any where else air can enter the cooling system does have air shutters and air conditioning. Quote Link to comment https://www.bigmacktrucks.com/topic/63277-coolant-pressure/ Share on other sites More sharing options...
1965 Posted July 12, 2020 Share Posted July 12, 2020 Have you checked radiator cap? Does it have coolant recovery tank? If it doesn’t your water level will not be completely full to rim. Quote Link to comment https://www.bigmacktrucks.com/topic/63277-coolant-pressure/#findComment-455689 Share on other sites More sharing options...
mack88 Posted July 12, 2020 Author Share Posted July 12, 2020 yes new rad cap no recovery tank Quote Link to comment https://www.bigmacktrucks.com/topic/63277-coolant-pressure/#findComment-455690 Share on other sites More sharing options...
1965 Posted July 12, 2020 Share Posted July 12, 2020 Not saying you don’t have problem but water level will be down couple inches from rim, it will puke out until it gets right. only way I know to check system is to take belts off water pump, remove thermostat & fill water to highest water level. Crank and see if you have bubbles. If so you can put something in between water manifold to make them separate & see what head and same with compressor. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/63277-coolant-pressure/#findComment-455692 Share on other sites More sharing options...
Mack Technician Posted July 12, 2020 Share Posted July 12, 2020 And tell Santa you want a confined space monitor for the “Christmas in July” party. A sniffer wand that reads the presence of combustion gases. Quote Link to comment https://www.bigmacktrucks.com/topic/63277-coolant-pressure/#findComment-455696 Share on other sites More sharing options...
mack88 Posted July 12, 2020 Author Share Posted July 12, 2020 heads were were done and came back with no cracks valves were good coolant is down 1in. or so from neck bit of a head scratcher my other 350 E6 when heads were leaking it spit wet black soot out the exhaust but this one has never done that no coolant in the oil ive had it running and dont see bubbles in the rad. Quote Link to comment https://www.bigmacktrucks.com/topic/63277-coolant-pressure/#findComment-455704 Share on other sites More sharing options...
1965 Posted July 12, 2020 Share Posted July 12, 2020 (edited) Nothing wrong run it, see if it clears up is low coolant light on? Edited July 12, 2020 by 1965 Quote Link to comment https://www.bigmacktrucks.com/topic/63277-coolant-pressure/#findComment-455705 Share on other sites More sharing options...
mack88 Posted July 12, 2020 Author Share Posted July 12, 2020 no low coolant light isn't on thanks for all your guys advise. Quote Link to comment https://www.bigmacktrucks.com/topic/63277-coolant-pressure/#findComment-455711 Share on other sites More sharing options...
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