I have a 2008 Tacoma v 6 auto with 63 k on it , I live in nj and this truck just came from Hawaii , the issue i have is there is no heat at idle , when you drive it gets heat . As of this posting the following things have been tried
1 The heater core has been replaced.
2 The t stat has been replaced .
3 The cooling system was eveacuated with a vacume coolant machine to rule out the system being air bound
When its running at idle at operating temperature the upper heater core hose is nice and hot but the lower return hose is bearly warm , rev the engine and they bith get hot . Any suggetions ? thanks Jim