If I recall correctly, there is no flow valve (open system).... heat is controlled via heater flaps in the
Heater Box Assembly... missing foam on the blend doors can cause "no heat" operation: (Google Search Image)
The lever should not "drop" (9 to 11 second mark)... worst case, it will be lying on the floor not doing anything.
If your engine is running hot hot... overheating, then it is probably a bad water pump.
October, 22, 2012 AT 1:49 AM
Valve should be located on heater hose line near firewall. It probably has a cable that runs from the dash heat setting to the valve. It can get stuck or the valve can get stuck. Check the cable for free motion as well as the valve. To flush the system do the same as a radiator flush with the heat setting all the way hot. Also leave it at the hot setting when refilling to avoid air in the system.
October, 25, 2012 AT 11:57 PM
Any luck finding the valve? I'd also be interested to know where it is.
October, 26, 2012 AT 9:34 AM
If you follow the heater hoses from the engine to the firewall you will find it.