So you have removed the mono valve and you always have coolant flowing to the Heater core, and you still dont have heat? What does the temp gauge show? If the coolant is getting up to temp, and the valve that stops the flow of coolant to the heater core is not there... the aux water pump could be clogged.. follow the heater lines around under the hood until you find it. I forget where its located at the moment.. Its a pump with heater hoses coming out both sides.. Maybe the pump is what you have already removed... There is a valve over near the batter that would have been my first guess.. Its just an electric solenoid that opens and closes to regulate the flow of coolant to the heater core... Sorry for the ramble I was just typing as I thought out loud.. Hope this helps.. Let us know.

Bill

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Bill

Backyard Shadetree Mechanic, 30 years running.

1987 300TD
1988 300E (sold, sniff)
1999 S320
1981 Volkswagen Rabbit Truck (Diesel)
2001 Ford Expedition
1988 Suzuki Samurai
On my list to buy: R129, for me, and a R107 for my wife.