heat trouble????

[cwilkie]

I am having the same problem. The supply hose goes from the intake to the bottom of the heater core. The top heater core hose goes to the radiator. I replaced the radiator and the trucks heating was great before the radiator needed to be replaced. The heater core is two years old and was installed when the 427bb was rebuilt and installed.

The water pump radiator return hose was also cool until I drilled two small holes in the 190f thermostat. The top radiator supply hose is also warm after a few minutes.

It seems like nothing is going to the heater core. When I squeeze both heater core hoses with the radiator cap off the coolant goes up and down. I ran the truck brief with the heater core return hose off and it was flowing strong. I am going to buy another 190 stat tomorrow and try this again. Any pointers will be appreciated.