• Why Mechanics remove car thermostats

    Posted on: September 24th, 2012 by admin 3 Comments

    Thermostat-resized-600.jpgIn modern cars, a bad thermostat can trigger the ‘check engine’ notification, it is this way because these mechanical valves now have electronic ties which make them part and parcel of your car’s entire engine management system.
    With that said, why do mechanics suggest the complete removal of these crucial components even when they are not yet bad? What I will do in this article is to give you point blank reasons why they feel it is necessary to do this, but before that, here is a brief description of how they go about removing a typical thermostat and the consequences that follow:

    As you might have noticed, radiator fans in new cars a thermostatically controlled, meaning they spin when the engine temperature requires them to (chances are that when your car is in swift motion your radiator fans don’t spin). Also, the device that switches radiator fans on or off in most cars is located within the thermostat housing, so when a typical thermostat is completely removed and not replaced, radiator fans don’t have that automatic factory on/off switch. A supposedly smart move by these mechanics to substitute for that switch is bypassing the pre-installed relays and connecting the fans directly to the battery; this can be akin to dismantling your domestic fan regulator and joining the positive and negative terminals of the wires to spin your fan. What this means is that whenever there is supply of electricity, the fan comes up; in the same manner in your car, so long the ignition is on and the battery supplies current, the radiator fans spins. With this in place, your engine can be over-cooled because water/coolant flows into the engine way too early and the continuously rotating fans are not helping matters at all. Another alarming truth is that with this arrangement in place, high voltage (12v) is being passed through low-resistance wires; you start wondering if those relays are for fancy for them to have by-passed it.

    So now back to why mechanics do this, most thermostats are made of metallic springs which are quite prone to rusting. Also, because mechanics generally discourage the use coolants (which have anti-rust properties), they would rather have the thermostat removed as ordinary water quickly kills thermostats. So to put it in plain words, the underlying understanding behind taking out a thermostat is hinged on the belief that since most cars drive around without coolants, it is equally not necessary to use thermostats which you have to keep changing over a short frame of time.
    This takes us back to the basics of taking care of your cooling system as earlier described in this article. Your car is your responsibility, take care of it.

    image credit:info.autoworksmn.com

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    3 Responses

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