Dressel's Automotive Connection vol3


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The Dressel's Automotive Connection

August 2011

This month's topic:

Valid Thru 10/2011

Air Conditioning!!

      Air conditioning was first introduced to the automobile in 1933 by a company in New York city, mostly in high end cars and limousine's.  The Packard Motor Car Company was the first to install A/C units in their production cars in 1939, due to its expense and loosing half of the trunk space, it was discontinued in 1941.  A/C systems came back to the automobile in 1954, the Nash Ambassador got the first front mounted mobile heating ventilation and air conditioning (hvac) unit as an option.  By 1960 about 20% of cars being built in the U.S. had A/C.  By 1970 over half of U.S. built cars had A/C.  Although still an option on some cars, the majority of cars built today come with A/C standard.

     A/C systems utilize the properties of a "refrigerant", in todays automobiles this is Tetrafluoroethane more commonly known as R134a.  Earlier A/C systems used Dichlorodifluoromethane, also called R12, the properties made this a better refrigerant but it is extremely damaging to the atmosphere, thus the switch was made in 1995 to R134a a safer refrigerant.

     Main components of auto A/C systems are: compressor, evaporator, condenser, condenser fan, orifice tube or expansion valve (depending on design), receiver dryer, blower unit and of course the refrigerant.  The system functions by circulating the refrigerant with the compressor, as it passes through the components the refrigerant absorbs and releases heat.

     Starting with the compressor, the compressor sucks the low pressure gas from the evaporator and sends it to the condenser as a high pressure gas, where the refrigerant condenses to a liquid and releases the heat it absorbed in the evaporator. The condenser fan blows air over the condenser to help cool the refrigerant (remove heat).  It then goes through a receiver dryer, which has a desiccant in it to remove any moisture from the refrigerant, then travels to the expansion valve or orifice tube where it turns back to low pressure and is passed through the evaporator.  As the refrigerant evaporates, it absorbs the heat from the passenger compartment (cools the air).  Then, it's back to the compressor to start the cycle over again!

     Many factors effect the performance of the A/C system.  The most common is low or no refrigerant in the system.  Some others are damaged or blocked condenser fins, improper or no blower operation, A/C compressor not functioning properly, saturated desiccant bag, and although uncommon, evaporator "freeze up" where the evaporator gets covered with ice.

     So to keep your A/C system running properly, call for an appointment for your A/C service today.  A/C system service includes: evacuate refrigerant (if any left), vacuum test system, check and clean condenser fins, install ultraviolet dye, and charge system with proper amount of refrigerant, and check output temperature at vents.

Dressel's News:

     We have been busy with repairs these past few months therefore we added a new member to our team.  Kirk Dunn started working at Dressel's on May 23rd.  He has over 21 years experience in the automotive industry and maintains a motto of "done once, done right."  We also think that it should be "Dunn once, done right," but either way his number one priority is your complete satisfaction which makes him a perfect fit here at Dressel's.

     The new tire machine and wheel balancer are here and we can now handle run-flat tires and low profile tires, as well as, tires up to 26" in diameter!

     We are now on Facebook and Twitter - make sure to follow us to keep up to date on everything Dressel's in between newsletters!

Auto Joke of the Month:

     .....And the surgeon says "try doing it with the engine running."  The mechanic responds, "the human body had been around  and the same for thousands of years, I have to keep up with new makes and models of cars every year.  Furthermore, I have to deal with my mistakes, you get to bury yours!"

Air Conditioning System Service
(regularly $166.25)
includes up to 2lbs refrigerant.

#2 Transmission Fluid Flush $109.99*
(regularly $129.99)
Special fluids extra.

Specials cannot be combined with any other offers.


dressels-crew-13SmCopyright © 2010 Dressel's Service Station LLC. All Rights Reserved.
Dressel's Service Station LLC, 161 W State St (Rt 202), Granby, MA 01033

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