However, the rule of 'hot always goes to cold' suggests putting the hot water back in to the bottom hose will actually increase cooling system effectiveness. The coolant temperature going into the bottom hose at that point MUST be below that in the main hose coming out of the radiator to give effective cooling. For most cars, the normal operating engine temperature is in a range of 195 to 220 degrees Fahrenheit, though most dashboard temperature gauges dont show. If it is put back into the bottom hose it will not work properly, if at all. The Coolant Temperature Sensor, also known as the coolant temperature switch, is an engine management system sensor used to monitor the engine coolants. If no heater or auxiliary matrix is used, plumb it into the top hose. And ALWAYS have coolant flowing out of the heater tap take-off. Perhaps it is the ECU compensating for it somehow in trimming ignition and fuel? If you are significantly increasing the power output, I strongly advise fitting one of the aforementioned two-core radiators. They will stand the limited modifications that can be made without problems. A small terminal coming out of the block itself will become visible. Peep in the middle of the pulleys at the front of the block. Use a drop light if you need better vision into the engine block. Just open the latch of the hood and hold it open. It is situated under the hood on the engine block. The exception appearing to be the fuel injected cars. Step 1: Locating the Coolant Temperature Sensor. The standard radiator can just about cope with a standard engine in most cases. In reality, effective surface area is the answer, and why the latest after-market, super-efficient two-core radiators are the best. It is possible the improvement in cooling was a product of more surface area created by the extra tubes, but the inefficient airflow through the congested radiator area reduced its ultimate effectiveness. Coolant capacity used to be the answer, hence the production of four-core radiators. No amount of tweaking the rest of the cooling system will help if there simply isn’t enough cooling capacity in the radiator.
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