Originally Posted by Zacharias

I would like to know too.

I have the same issue, but only after a restart (warm or hot engine). Sometimes loses heat at low speeds as well.

But after a cold start the system works fine all the time.

Originally Posted by jaybutter

Here are some photos of the brass solenoid valve that I installed in place of my mono valve. For the top connection I used a street elbow and a thread to hose barb adapter and on the bottom just an adapter. I used tie wraps to hold the valve up wrapped around the original valve mount which is a little rigged. The first photo is from the ebay listing for the valve from a seller named "duda diesel" (I'm not kidding). Seems like a fine company! Valve is brass body, buna-n rubber, 1/2", 12VDC, and normally open.