Is there a diagram of the coolant system for 1994 Oldsmobile achieva?

Answer 1

I have a Haynes manual for the Achieva and no diagrams are supplied for the coolant system.  In general, most coolant systems in vehicles are similar.  Here are the key sections: 1.  Thermostat -- A water valve that closes when the engine cools to a certain point.  Its job is to hold coolant inside the engine block until the temperature rises to a certain level.  When the coolant is hot enough it moves out of the block. 2.  Water Pump -- Pushes coolant through the block and radiator systems 3.  Radiator -- The radiator provides a means for coolant to shed heat.  Coolant typically enter the radiator at the top, driven by the water pump and the exits at the bottom. 4.  Overflow Reservoir -- This is a container that provides storage space for coolant as it expands when the engine is hot.  As the engine cools and the coolant contracts, it is drawn back into the cooling system. 5.  Heater Core -- The heater core receives heated coolant from the system.  A fan blowing across coils transfers heat into the air where it is blown into the passenger compartment. 6.  Cooling Fan -- Generally this electric fan turns on when a sensor tells it the water temperature is too warm.  The electric fan improves fuel economy because it loads the engine only when it is running.  Older styles of fans were driven by the belt and pulley system, which means they turned all the time the engine was running. 7.  Coolant Cycle (in general) -- Thermostat holds coolant inside the block until it reaches a certain temperature.  Thermostat opens and coolant reaches the water pump which  pushes coolant into the top of the radiator, coolant flows from the bottom of the radiator into the engine block and the heater core.  Coolant flows through the block back to the water pump. Specific information can be provided based on the vehicle model, year and engine data. ======== Appendix. Cooling system contains also the information Engine Coolant Temperature Sensor with two contacts that located on the thermostat housing, Elecrtonic Control Module (ECM) in the salon, the radiator fan relay in the box on the fireboard and the safety cap on the reserve coolant tank. The second reference Engine Coolant Temperature Sensor on the housing body has one contact (the second contact is on the sensor body) and used for the temperature indicator on the panel. I myself, 8/29/09