autoacrepair1

[autoacrepair1]

How can a broken radiator fan on a car cause the air conditioning to stop working properly?

How can a broken radiator fan on a car cause the air conditioning to stop working properly?

What is the purpose of the radiator fan assembly ?

The purpose of the fan is to maintain adequate airflow through the radiator and condenser core, especially at low vehicle speeds and when the engine is idling, sitting still. The fan is used to speed up the natural draft through the radiator/condenser or create one if the vehicle isn’t moving. At high motor vehicle speeds the ram effect through…

[autoacrepair1]

My car AC compressor has blown 15 minutes after a regas/recharge. What could be the cause?

My car AC compressor has blown 15 minutes after a regas/recharge. What could be the cause?

AC compressor has blown 15 minutes after a regas/recharge.

There is a high chance the system was working with a low refrigerant charge. It was a system performing poorly, but depending on weather conditions the driver wouldn’t notice a problem with the A/C system.

After the system was charged up to full capacity a problem with some restriction on the system or a fan clutch/radiator fan assembly…

[autoacrepair1]

What do automobile engine manufacturers think about the use of oil “Stop Leak” products ? What Manufacturers think about the use of a/c “Stop Leak” ? Refrigerant must be 99% or more, pure,

[autoacrepair1]

Why would my car not blow air until after I hit a bump?

Why would my car not blow air until after I hit a bump?

Blower motor only start working after i hit a bump.

Bad blower motor brushes

Blower motor faulty pigtail

In most cases that is a sign of worn down blower motor brushes not making a good contact. In some cases the blower motor/resistor pigtail could cause erratic operation of the blower motor too.

What is a blower motor?

The blower motor is a simple squirrel cage type of fan, DC electrical motor.…

[autoacrepair1]

If your car's AC compressor needs to be replaced, what else should be replaced at the same time to avoid any other problems?

If your car’s AC compressor needs to be replaced, what else should be replaced at the same time to avoid any other problems?

What components should be replaced to avoid any other problems with the new compressor?

  Compressor

TXV(Thermal Expansion valve/FOT(Fixed Orifice Tube)

Receiver-drier / Accumulator

Seals at every connection open(O-rings /washers)

Condenser

Flush A/C lines

Balance compressor oil and A/C components replaced oil

Pull a deep vacuum

Recharge

The AC compressor should last for the entire life of the…

[autoacrepair1]

How does a car's air conditioning system know when to kick in to cool off the inside of the car? Or does it just run continuously as long as you have the AC on?

How does a car’s air conditioning system know when to kick in to cool off the inside of the car? Or does it just run continuously as long as you have the AC on?

Controlling modern air conditioning systems.

For many years, the air conditioning compressor was controlled directly from the dashboard; when the A/C button was pushed, voltage would typically travel from the control head through the evaporator switch, the protection switch and through the compressor clutch to ground.

But that changed with the advent of on-board control computers, and since the…

[autoacrepair1]

How long should an air conditioner compressor last in a car?

How long should an air conditioner compressor last in a car?

The AC compressor should last for the entire life of the car,usually 8-10 years.

System maintenance and compressor efficiency

  The compressor’s efficiency can be improved by maintaining the correct working conditions. This involves keeping the suction pressure as high as practical and the head pressure as low as practical within the design parameters.

A dirty evaporatorwill cause the suction…

[autoacrepair1]

What does this mean If a car suddenly begins to blow hot air when you turn on the A/C, then sometimes it blows cold air for a little while?

What does this mean If a car suddenly begins to blow hot air when you turn on the A/C, then sometimes it blows cold air for a little while?

We need to make sure what is the sequence of events here, because the cause could be different.

After car startup A/C blows hot then sometimes blow cold.

  A/C  Climate Control faulty

Blend door stuck

A/C Actuator motor Faulty

What does an AC actuator do?

The AC actuator moves air distribution doors to two or more positions to direct air flow for heating and A/C vents. The AC actuator is located…

[autoacrepair1]

What causes an air compressor to lock up?

What causes an air compressor to lock up?

  Auto air conditioning compressor

What causes an air compressor to lock up?

  Lack of lubrication

Cooling system poor performance

Condenser fan not working or performing poorly

A/C  system overcharged

Incorrect type of oil

Low refrigerant charge

A/C system contamination

A/C refrigerant cross contamination (Charging R-134a refrigerant into R-1234YF refrigerant.)

Inefficient condenser

Dirty…

[autoacrepair1]

What are the Symptoms of a Bad or Failing Ambient Temperature Sensor?

What are the Symptoms of a Bad or Failing Ambient Temperature Sensor?

Diagnosing a bad or failing Ambient Temperature Sensor.

The air conditioning  “AUTO MODE “ won’t  work

Inconsistent cooling or not cooling at all.

A/C compressor inoperative

Incorrect reading on temperature gauge. Usually a default negative temperature.

Thermistor.

The most common variable resistor is a thermistor.Thermistors change resistance based on…

[autoacrepair1]

What is the purpose of the cycling switch in a cycling clutch system?

What is the purpose of the cycling switch in a cycling clutch system?

The A/C cycling switch cycles the compressor clutch on and off to maintain evaporator temperatures above freezing.

Where is the clutch cycling switch located?

Thermostatic cycling switch: Some vehicles mount it in the engine compartment, near the evaporator case. Others mount theirs under the dashboard near the evaporator.

Pressure cycling switch: The A/C pressure cycling switch is…

[autoacrepair1]

How do I know if my AC clutch relay is bad?

How do I know if my AC clutch relay is bad?

What is a clutch relay?

A relay is a device that allows you to control high amperage circuit from low amperage circuit.

Automotive switches and electronics are wired to relays since they aren’t designed to handle the arcing and high current demand required in some circuits.

How a relay works

Every relay has at least two circuits running through it: a low-amperage, or CONTROL…

[autoacrepair1]

How do you diagnose an air conditioner

How do you diagnose an air conditioner

Air Flow

No air flow

Inspect blower motor

Inspect blower motor resistor

Inspect fuse

Inspect A/C climate control

Inspect connectors

Inspect harness

Inspect hvac box for

Cooling

No cooling

Inspect A/C switch

Check refrigerant level

Inspect clutch relay

Inspect PCM/BCM/ECM

Inspect A/C pressure switch

Inspect compressor clutch coil

Inspect compressor clutch

Inspect compressor clutch air gap

Inspect…

[autoacrepair1]

Auto A/C Sight Glass diagnosis.

Auto A/C Sight Glass diagnosis.

A/C SIGHT GLASS DIAGNOSIS.

A sight glass is a transparent glass tube or window installed in a tank or boiler system that allows an observer to view what is happening inside the system.

The refrigerant sight glass is normally located anywhere liquid flow exists and anywhere it can serve a purpose. When it is installed just prior to the expansion device, the technician can be assured that a…

[autoacrepair1]

Can I drive my car with a bad AC compressor?

Can I drive my car with a bad AC compressor?

The 2020 Dodge Charger Scat Pack Widebody features a best-in-class, naturally aspirated 485-horsepower from the proven 392 cubic inch HEMI® V-8 engine

Will a bad AC compressor affect the engine?

A bad compressor could affect the engine in your car. If your compressor’s pulley bearing goes bad, your engine can stall due to the stuck compressor or the serpentine belt may break affecting all the…

[autoacrepair1]

Does engine coolant affect ac performance?

Does engine coolant affect ac performance?

The 2020 Dodge Charger Scat Pack Widebody features a best-in-class, naturally aspirated 485-horsepower from the proven 392 cubic inch HEMI® V-8 engine

High coolant temperature affects A/C performance.

The engine cooling system has an indirect influence on the performance of the A/C system. High under hood temperatures can be the cause of poor A/C output.

Always verify correct operation of:

[autoacrepair1]

Why did my car AC stop blowing air ?

Why did my car AC stop blowing air ?

My car A/C stop blowing air from the vents.

Common reasons for this to happen:

A/C blower motor circuit blown fuse

Bad blower motor resistor

Blower motor shorted

Bad blower motor control switch

Poor ground connection

Poor blower motor connections

Ram air flowing through the evaporator does not provide enough air flow inside the vehicle for cooling purposes. So,…