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AlexIII 03-23-2005, 04:37 PM HELP...I have replaced the heads and the thing was running fine sat for about a month and now the thing doesn't like to stay below 220 Criusing at 65. If you stay at thirty it is great. That is with teh truck empty. I just replaced the coolant, thermostat, and fan clutch just to be sure. Still same problem any ideas. Now i am getting codes 78 92 97 McRay 03-23-2005, 05:16 PM Have you tried a mechanical temperature gauge to see true temp. Does temp change with heater no or off ,is fan belt slipping or Water hose weak sucking shut causing higher than normal temp. guybb3 03-24-2005, 08:08 AM Head gaskets correct ones? quantum mechanic 03-24-2005, 08:18 AM DTC 78 is boost range code. 92 is cylinder balance fault #2 97 ic cylinder balance fault #7 Are you sure those heads were good, they appear to be leaking pressure on two cylinders. | ||