Where is your other heater hose connected? If it's at the water pump, there will be very little or no flow through the heater core. If it's at the cylinder head, using the port in the upper thermostat housing will create a huge volume of coolant which bypasses the thermostat, resulting in slow engine warmup.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!