Abstract: This invention is a circuit for a vehicle which will enable the engine to run, and the heater or air conditioner to operate without the key in the ignition switch by supplying power to the ignition and acessory circuits. The operation starts the vehicle, presses a switch, then removes the key. Now the engine is idling, and the heater or air condition will work, but the vehicle cannot be driven. The circuit automatically shuts off if the vehicle is put into gear. It also shuts off if the vehicle's engine overheats, or looses oil pressure. The vehicle may be driven by reinserting the key into the ignition switch and turning it to the "ON" position. The starter is disabled while the circuit is enabled, in case the operator turns the ignition switch to "START" while turning it to the "ON" position. This prevents damage to the starter and flywheel. The circuit can only be energized while the vehicle's engine is running.