Tag Archives: coolant

Cool runnings


By Steve Schaeber, MACS Technical Editor The main purpose of a thermostat is to help the cooling system regulate engine operating temperatures to within the manufacturer’s specification. This is normally done by first remaining closed to allow engine coolant to … Continue reading

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Did you know there will be a world record challenge on Monday?


Australian motoring enthusiast Rod Wade, aka the Vintage Adventurer, is preparing to set a new world record in the Ocean to Ocean Driving Challenge as he drives his 1930 Ford Model A, against the clock from New York to California. … Continue reading

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ACDelco’s guidelines for replacing engine coolant


Under what conditions should you replace a vehicle’s engine coolant? After vehicle service repairs when a heater core, radiator or water pump was replaced, a check of the thermostat, hoses and coolant should be performed. The coolant may need to be replaced due to corrosion, contamination, or insufficient inhibitor levels. Continue reading

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Coolant questions asked and answered


In a previous MACS blog post we discussed Seven reasons why coolants may fail at low mileage. That post led to several interesting questions from Richard in New Zealand, who explained he was “not a mechanic and seeking honest advice.” To answer his specific questions, we submitted them to MACS member Dr. David Turcotte, Zerex Director at the Valvoline Company.

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Ford goes orange


The Ford owners’ and enthusiasts forums on the Internet are awash in questions and discussions of Ford Motor Company’s recently-announced gradual changeover to a standard coolant for all their engines. Some owners are concerned that their favorite car company has crossed over to “the dark side” and adopted General Motors Dex-Cool, a sure sign of an automotive apocalypse. Continue reading

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Service professional’s procedures for drain fill and bleed


Before draining the coolant, warm up the vehicle until the thermostat opens. Shut the engine off and place a pan under the radiator drain (the petcock) to catch the old coolant. Turning the petcock to loosen it will allow coolant to drain from the radiator. Once the coolant stops flowing, the pressure from the system has been released and you can remove the radiator cap to allow the coolant to drain completely.

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Why pressure test an engine cooling system?


Pressure testing is used to check for leaks in the cooling system and to test the radiator cap. Continue reading

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How to test for electrolysis


According to MACS member Spectra Premium Industries, a North American manufacturer of many aftermarket A/C and engine cooling system parts, testing for electrolysis is a simple task. Use a digital volt ohms meter (DVOM). Set your meter to DC volts. With the engine off, hook the negative lead from the meter to the negative post of the battery. Continue reading

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How to check coolant circulation


One way to check for proper coolant circulation is to check the upper and lower radiator hoses. The upper radiator hose should be hot, around 190–200 °F. (The safest and most accurate way to get this temperature reading is with … Continue reading

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How to check the quality of your coolant


Coolant of good quality will be brightly colored. As coolant becomes old, it usually turns into a brownish, rust colored liquid. At this point the coolant is past its useful life and must be changed.

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