HAC-101 Flashcard 3

Front

An A/C system becomes undercharged when: There is a leak in the system, or the system was not properly charged; The system wasn't properly evacuated, or too much refrigerant is added; The A/C compressor is not working properly; The condenser is not exchanging enough heat.

Back

There is a leak in the system, or the system was not properly charged.

Front

To perform any work on any mobile HVAC system, what kind of certification must the technician hold?

Back

EPA 609

Front

You are assigned a Repair Order. The service advisor wrote the following: "Customer states A/C not working. Check and advise". What is the first thing you should do?

Back

Verify whether the blower fan and compressor clutch are working

Front

What is the purpose of a low pressure switch, in a HVAC system?

Back

To open the A/C compressor clutch circuit, preventing the compressor from running without lubricant oil

Front

The high pressure switch of an HVAC system opens the A/C clutch circuit at which pressure?

Back

The vehicle's S.I. will have the accurate information for the car I am working on

Front

On an HVAC manifold gauge, the gauge with the blue color measures pressure on the ______ side, and the red one measures pressure at the _______ side.

Back

Low, High

Front

How do you know which port is the high side, and which is the low side on a vehicle's A/C system when the hoses are painted black?

Back

Low side has the bigger diameter port, high side has the smaller one.

Front

When conducting a leak detection test using the fluorescent dye and ultraviolet lamp method, what is recommended to do prior to start the test? Options: Thoroughly clean the HVAC system in the engine bay area, including the service ports and condenser, Wipe down the service ports and TXV / F. Orifice, Warm up the engine and set A/C to max cool, Make sure there is enough air to be cooled by the evaporator

Back

Thoroughly clean the HVAC system in the engine bay area, including the service ports and condenser

Front

What is the ideal procedure for conducting the fluorescent dye/u.v. lamp leak test on a A/C system?

Back

Thoroughly clean the A/C system, add dye to the system, set fan to max, temperature to coldest and let vehicle sit under the sun for 30 min at least.