I HAVE A 316 1988 CARBURRETTER MODEL. THE BOTTOM HOSE TO THE THERMOSTAT REMAINS COLD EVEN THOUGH THE TOP 2 ARE HOT. THIS IS A NEW THERMOSTAT. CAN ANYONE GIVE ME ADVICE FOR A HOME REPAIR IF POSSIBLE. I HAVE BEEN TOLD TO LOOK AT THE HEATER MATRIX AND WATER PUMP. WHERE ARE THEY! AND HOW CAN I TEST THEM. I HAVE REPLACED 2 BLOWN HOSES SINCE THIS PROBLEM STARTED. ANY HELP WILL BE APPRECIATED, THANKS....