According to the gm schematic from the dealer for a 98 this should be the high pressure switch.
Gm ac compressor high pressure switch.
The switch turns the compressor clutch field coil off and on.
Acdelco 15 5687 gm original equipment air conditioning compressor high pressure cut off switch 4 4 out of 5 stars 43.
High pressure switch normally closed closes 245 psi.
On the older compressors some did have a switch in the backside sometimes 2.
Item 220.
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Acdelco gm original equipment a c clutch cycle switches are component sensors that monitor the evaporator temperature and pressure.
Signs of a failing a c pressure switch include your a c being unable.
Checker has two different hi pressure switches.
When the pressure and temperature are too low the compressor is switched off.
This switch is crucial for proper a c performance.
Item 220 420 gm harrison compressor switch black.
Acdelco 15 5378 gm original equipment air conditioning orifice tube 6 63.
Only leaking air conditioning systems have low refrigerant levels.
This will usually happen when a condenser fan fails.
An automotive air conditioner s pressure switch cycles the vehicle s compressor on and off when the refrigerant pressure falls below an acceptable level.
This protects the compressor from damage.
A high and low pressure switch.
Acdelco 15 2962 gm original equipment air conditioning clutch cycling switch 4 7 out of 5 stars 123.
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The low pressure switch is designed to shut the compressor down if the pressure becomes to low or the evaporator freezes.
The chevrolet truck uses two air conditioning pressure switches.
Refrigerant does not wear out or evaporate.
Acdelco 15 5687 gm original equipment air conditioning compressor high pressure cut off switch 20 93.
Most of the time it was just a high pressure switch which is a closed switch unless the pressure in the system goes above a set point where it opens the circuit and causes the compressor s clutch to disengage.
The a c pressure switch is mounted on both the high and low sides of your a c.
One that would fit the back of the compressor and one that would fit the supply line on the system.
This line is also switched with the ac button on the dash.
The high pressure switch is designed to shut down the compressor if the line pressure gets dangerously high.