Question When an engine is started: Answers The brakes should be locked up. Warning lights should come on and then quickly turn off. The coolant temperature will decrease. The hood must be open. Explanation After a vehicle is started, the warning lights and buzzers should go out after a few seconds. If the warning signals do not turn off, there may be something wrong with the vehicle. Take a FREE Practice Test Now This questions appears in the following tests: Montana Knowledge Test Class A , South Dakota Knowledge Test Class A , District Of Columbia Knowledge Test Class B ,