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I changed the track on my 04 700 RMK. Put on a tunnel extension so I had to drain the coolant. The only other thing I did was clean the exhaust valves. I filled it with coolant, bleed the system, the rear heat exchanger is getting hot, no air comes out when I open the bleed screw. TKhe problem is when I come to a stop and let the machine idle, the rpm stays at about 3500. Is this something I should be concerned about? Should I adjust the idle to where it should be? thanks.