Quote:
Originally Posted by gregp1962
ROLLGUY, what do you mean when you say remove the lower section of the cartridge? I'm trying to block it open since it appears that coolant isn't flowing at higher speeds even though it isn't energized. I don't even have the electrical connection hooked up now.
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The rubber plunger that makes the seal is retained by an E clip. If you disassemble the valve, you could simply remove the plunger from the shaft.
That said, your symptoms are so classic for a bad monovalve I would not waste a lot time with further troubleshooting, especially if you find a torn diaphragm.
Quote:
Originally Posted by rocky raccoon
Simply unplugging should produce full heat.
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With a properly functioning monovalve, that is true. But with a torn diaphragm or a poor quality aftermarket valve, the increased dynamic coolant pressure at higher engine RPM will mechanically overcome the spring pressure of the valve and push the valve to the closed position. Hence, good heat at low RPM and no heat at highway speeds above at 45 mph.