I have a Ford Escape 2014. The code is P26b7 the coolant The engine cooling system incorporates a coolant bypass solenoid valve and a coolant shutoff solenoid valve. Using these two valves, the coolant flow through the engine block can be restricted or completely stagnated. The restriction or stagnation of the coolant flow makes it possible for the engine components to warm up faster during the warm-up phase. Engine Coolant Bypass Valve | 902-055 | Water Control Dorman Products - 902-055 : Water Control Valve. This aftermarket-exclusive valve maintains a continuous flow of coolant through the engine block. Symptoms of a failed coolant bypass valve include illumination of the check engine light. This part restores optimal vehicle performance. What does a coolant bypass valve do - Answers The coolant air bleed valve is located on the top of the thermostat bypass pipe/heater pipe assembly. Close the valve once a continuous stream of coolant is expelled from the valve.