chad1966, hard to believe low coolant was rendering GPs inop. Thermo sensor should be giving simple resistance value to GP controller. Unplugging sensor gives signal of max resistance, fooling the GP controller into thinking it's very cold, needing max GP time. Hot thermo sensor should give low resistance signal to GP controller, telling it no need for GP. How would low coolant level cause this?
I do strongly agree on the value of a low coolant warning lamp, would help eliminate a major factor in premature death for these engines, I plan to install on my car, here is a helpful description:
Loss of Coolant Sensor for Volvo 740/940 Cars:
http://www.brickboard.com/FAQ/700-90...olvo740940Cars