I recently changed the heater core in the blazer. Also replaced the thermostat and heater hoses. Before the change the gauge would read 200-210 and stay steady. Now the gauge will go to 240 and does not blow hot air at all. If I feel the heater hoses, they are cool, the upper hose sounds like air is in the system, the lower hose is warm but not unbearable. I am wondering if I might have a blown head gasket on the exhaust side. I tried the block tester but had to put it in the overflow tank not the radiator as I do not have the adapter. When testing this is remained blue but still think it needs to go in the radiator not coolant tank.
have the same problem?
Saturday, March 6th, 2010 AT 12:42 PM