I´ve noticed at least three different kinds of heater valves (may be more). Need a four connection type (motor in and out, heater in and out) for the open system. If you have the four connection type, did you get the in and out mixed up/heater side, motor side? If your sure it´s hooked up right, crack the line from the thermostat at the heater valve and check for air. Same with the top heater hose at the valve, with the valve under vacume (just crack it a little, don´t want to spray coolant every where). Be careful at the valve, they break. When you changed the thermo, did you use the OEM style gasket, if the gasket is covering the heater hose outlet, it ain´t gonna work. Is there vacume at the heater valve line, with the heater in heat position. Is your heater plugged? Did you back flush it?
I´ve gotten so when I have the cooling system drained, I grab an extra piece of heater hose, hook it up to the heater inlet, put a pan under the motor and blow. After the coolant comes out, you can tell pretty quick, if it´s restricted, can´t hardly blow through there, a clean heater will offer very little resistance.
No comment about my methods, only works with cars. :lickout:
I´m out of breath and ideas.
