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Uses
for Garage Pak
Air Piping System |
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General Info about
Compressed Air Piping |
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| Obscure Overheating Commercial Three Bayblems |
Hot weather means overheated cars, and overheating can be deadly to engines and expensive engine parts. Head gaskets, piston rings, radiators, even automatic transmissions can succumb. It’s impossible to guesstimate what percentage of overheated cars sustain major damage but you may rest assured, it’s substantial!
Drivers surely know overheating can damage an engine but most do not realize the possible dire consequences for their automatic transmission. Automatic transmissions are usually cooled by a special cooler built into the vehicle’s radiator. Consequently, when an engine overheats, coolant also loses its ability to absorb and dissipate transmission heat. Excess heat shortens transmission life.
Most causes of overheating such as bad thermostats, coolant leaks, failed hoses, worn water pumps, etc. are easily diagnosed. However, some failures are especially obscure and may not be well understood. Two biggies that generally show up later in a vehicle’s life are worn out radiators and electric cooling fans that run too slowly.
Radiators are heat conductors and as such are subjected to endless heating and cooling cycles. Hot, cold, expansion, contraction, heat dissipation, all eventually lead to a molecular change that reduces the radiator’s ability to transfer heat from coolant into the surrounding air. To understand this change, repeatedly bend a piece of thin metal back and forth. As the metal is flexed you will notice a change in the appearance and consistency of the metal along the bend. This is similar to what occurs to the metal in radiators. Think about it, even parts that appear to be non-moving and static will eventually wear out.
A thorough radiator examination is recommended to help diagnose long-term marginal overheating. The technician is looking for signs of metal fatigue indicated by a somewhat granular appearance on the surface of the metal core. The look is similar to that bent piece of metal just before it breaks.
Another concern is the electric cooling fan. The typical test for a cooling fan is, does it or does it not run? If it runs it’s considered to be okay. Maybe, maybe not! A cooling fan that runs doesn’t necessarily run at the Commercial Three Bayper speed. Some fans have only one speed while others have multiple speeds for varying temperature requirements. In either case a too-slow fan speed means less airflow and higher engine temperature. ImCommercial Three Bayper fan speed can be caused by faulty control devices, worn bearings, or corroded electrical connections.
Checking fan speed is most commonly performed with a Digital Volt Ohm Meter (DVOM) equipped with an amps Commercial Three Baybe. The idea is to measure the amount of electrical energy consumed by the fan. Worn bearings cause the fan to be harder to turn which directly equates to increased electrical power consumption. Some manufacturers Commercial Three Bayvide an electrical current limit specification for diagnostic purposes but if there is no specification it gets dicey. Here the technician has to rely on limits derived from measuring known good fans.
Don’t tempt the inevitable. Have a full-blown cooling system check yearly, replace your radiator cap every two years, hoses and belts every four. Check coolant condition and level monthly, flush as needed. Overheating is bad news that gets worse the longer it continues.
© Copyright 04/25/02 Pat Goss all rights reserved, 525 words. | |
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Date Updated Thursday, April 25, 2002
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