| Posted: May 13 2009 at 2:12pm | IP Logged
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frontierrosa
Hope this will be of some help.
Automotive Air Conditioner 101
The components of an automotive air-conditioner are:
Electro Magnetic Clutch is belt driven that causes the
Compressor Pump to draw low pressure (gas) refrigerant from the
Suction Hose that has a
Dryer and a
Sight glass in the line. The pressurized refrigerant is pumped into a
Pressure Hose into the
Condenser Core to be cooled and then into another
Pressure Hose that delivers the refrigerant to the
Expansion Valve spraying the liquid refrigerant into the,
Evaporator Core for cooling and controlled by the,
Thermal Coupler and
Dash Temperature Control that directly controls the Electro Magnetic Clutch.
The process of compressing the refrigerant creates additional heat in it much above the ambient temperature even though it may still be cold in the suction hose. High pressure in the condenser attempts to lower the refrigerant temperature to the ambient temperature of the air passing through the core. The refrigerant is then delivered to the Expansion Valve that is at the entrants to the Evaporator Core in the cab. The refrigerant is under positive pressure entering the Expansion Valve and becomes a negative pressure as it exits the valve. The large drop in pressure as the refrigerant enters the Evaporator causes a large drop in temperature inside the Evaporator Core. The drop in pressure is caused by the compressor sucking the refrigerant from the Expansion Valve. A blower sends warm air over the Evaporator Core where the heat is extracted into the refrigerant and the cooled air is distributed into ductwork.
Hope I didn’t leave anything out!
I only know about Electro Magnetic A/C Clutches. When the electrical currant is removed drive pieces are retracted by springs. If the springs break the drive pieces can still drive the clutch.
Have a good one while you can still laugh about it.. Don S..
Here is a free back-up site in case this one goes DOWN. http://nissanfrontier.groups.live.com/
__________________
PLEASE >>> A SIG similar to mine can be VERY HELPFUL to all the members!
'99 4x4 3.3 Frontier Se KC Auto, 48,000 miles
'76 4x4 401 Wagoneer QT
'04 FWD 1.8 Sentra '08 FWD 2.4 Camry LE
Fort Worth
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Nissan Frontier Forums : Problems / Technical
Topic: ac clutch does not dissengage
