remevmb Posted May 6, 2013 Share Posted May 6, 2013 Has anyone had a problem with their Champ overheating? Mine gets the header tank of the Rad very hot, but the bottom hose is only just off cold. I've changed the thermostat for a known good one, but still the same. The temp guage reads full temp. but there is no sign of boiling. Can you remove the thermostat and run without? Any suggestions please. Quote Link to comment Share on other sites More sharing options...
griff66 Posted May 6, 2013 Share Posted May 6, 2013 is system pressurising ? Quote Link to comment Share on other sites More sharing options...
arcot1751 Posted May 6, 2013 Share Posted May 6, 2013 If the top hose is hot and bottom hose is cold, it seems like there could be either an air lock and/or the water is not circulating. One thing to try is remove the thermostat and starting the engine afterwards you should see the water moving in the top of the rad when you rev the engine. Is the water pump actually turning I once looked at an engine that ran but got hot virtually straight away, turned out the fan belt was so loose it was slipping as the actual water pump was seized solid ! Very unlikely I know but it did happen, the fan belt finally failed. :red: To get rid of air locks try slackening the hose clips and bleeding the air out of each one then retightening the clips. The rad could be blocked so try back flushing it by running a hose through it the opposite way to normal flow, keep the hose running until the water is running clear, again this is easier done without the thermostat in place. Using an air line blow out the rad matrix from the inside out ie. opposite to normal air flow. The impellers in water pumps can gradually break up and so will then not shift the volume of water they should. All in all it is a question of working your way through things the clue is probably the hoses being different temperatures this does point to a circulation problem so thermostat, air locks, pump are all worth checking. Good luck. Quote Link to comment Share on other sites More sharing options...
antar Posted May 6, 2013 Share Posted May 6, 2013 As stated in the above reply I have actually seen a Champ water pump impeller that had completely eroded away, hence no flow through the system. Quote Link to comment Share on other sites More sharing options...
Pete Ashby Posted May 7, 2013 Share Posted May 7, 2013 (edited) After you check that your pump is functioning a full cooling system flush would be useful. As an aside be very careful if you blow the rad fins through with compressed air it will clean out dust and debris however don't use too much pressure or you may damage the tubes and fins. From what you describe I'm not sure that clogged fins are your problem as this condition would lead to general heating of both top and bottom tanks (assuming the pump is operational) as a result of inefficient heat exchange. As another aside removing a thermostat from a cooling system is never really the answer to a cooling problem it just hides the real issue for a while longer. Pete Edited May 7, 2013 by Pete Ashby Quote Link to comment Share on other sites More sharing options...
remevmb Posted May 9, 2013 Author Share Posted May 9, 2013 Thanks for the response. I'll give your suggestions a try and let you know how it goes. Quote Link to comment Share on other sites More sharing options...
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