Whenever your vehicle A/C is not blowing “cold air”, the very first thought is to dread. $ $$$ signals are moving through your mind. Your A/C is broken along with the repair will be costly. This article takes the mystery out of automotive air conditioning and functions as a primer so you can make common repairs and save MONEY on specialist repairs.
There are books and publications that include volumes of information about the topic of ac condenser repair magnolia tx. This information is often too specialized for the one to find out how to fix your auto air conditioning system.
In the nutshell, here is everything that you will need to know more about the principles of pipes so that you are able to fix your auto air conditioning system yourself.
Air conditioning is the process where air within the passenger compartment is cooled, dried, and circulated. Heat is removed from inside the car and transferred to the outside air.
All air conditioners whether, it’s an automobile A/C, household refrigerator or home HVAC, operate on the very same principles. Significantly, a liquid refrigerant is changed to a gas and back to a liquid. In case a change-of-state of this refrigerant is to take place, heat transfer needs to take place. The two (2) principles that apply to refrigerant are:
1. The refrigerant in a gaseous state collects, absorbs, and retains warmth.
2. The refrigerant in a liquid state releases that warmth.
A/C Operation and Components
For your auto A/C to blow “cold air”, R-134A refrigerant must pass and alter condition in three (3) parts, one (1) receiver-dryer, and one (1) expansion valve that makes up the closed car air conditioning system. The components of the system are:
1. Compressor – A device that pressurizes the heated refrigerant. .
2. Condenser – A radiator for refrigerant that transports the heat that has been consumed in the passenger compartment into the cooler air.
3. Evaporator – Is that a little radiator situated under dash in the passenger compartment. Liquid refrigerant entering the evaporator creates a pressure loss. The liquid refrigerant absorbs heat from the air blowing across the evaporator. It then boils and changes state to vapor before it enters the suction port of the compressor.
4. Receiver-Dryer – Is a canister that stores the liquid once the compressor is not running. It contains a desiccant that eliminates moisture from the computer system.
5. Expansion Valve – Is a metering device that controls the amount of refrigerant to the evaporator.
A/C Quick Check
A check which can readily be made to check the health of the A/C system is that the “feel check”. With engine running, turn the auto A/C control to “ON” and the blower on “high”. Take a test drive to heat the motor until the A/C system stresses stabilize. Raise the hood. With the A/C “On”, locate the huge tubing connected and routed from the breaker (low side) into the expansion valve (inlet side) of the evaporator. Next, find the small tubing that’s connected to the discharge-side of this compressor and routed to the outlet side of the evaporator. When you are feeling these two (two) lines, then you need to observe these results:
1. The low-side line should feel “cool” to the touch.
2. The high-side line should feel “warm” to the touch.
If the high-side tubing isn’t warm and the low-side isn’t trendy, additional evaluations might have to be made as the system is not doing any work. There is an internal problem; for example, a defective component or a flow on your A/C system.
Assessing A/C System
Before system temperature evaluations could be created, a checklist Ought to Be followed (below) to setup for analyzing the A/C system:
1. Set the A/C “ON-OFF” switch to “ON”.
2. Set the temperature control to “maximum cooling”.
3. Set the mill on “high” or the highest number on the controller switch.
4. Temperature inside passenger compartment ought to be stable and getting cooler.
6. All windows should be maintain the “UP” position.
Your compact car or truck has a small capacity A/C system along with a reduction of “cooling” are more noticeable than a bigger capacity automobile A/C system. If a noticeable reduction of “cooling” capability is noticed, a temperature check in the port registers should be made. This test could be produced with an instant read or electronic temperature thermometer. . The discharge air from the vents in the passenger compartment should range from 38 to 42 degrees F.
A/C System Diagnosis
Assuming that the release air evaluation measured at the vent registers is out-of-range, a system pressure evaluation will need to be produced. Professional A/C technicians join a tool known as the manifold gauge set to the “low” and “high” side support valves of the system. For one to diagnose and appear inside the A/C, it is going to be necessary to become adept in the usage of the manifold gauge set.
A manifold gauge set which is suitable for the needs can be obtained at most auto supply stores and Internet A/C instrument and provide store fronts for under $50.00. TIP: Look for a gauge set which has an integrated sight glass.
Locate the “low” and “high” side agency valves. . Connect the hoses (they’re a snap connector fit) to the service valves in the following manner:.
1. Connect the blue nozzle of the gauge set to the “low-side” service valve of the compressor.
3. The yellow hose of the gauge set is connected to a vacuum pump or a refrigerant can to add refrigerant to the system.
With the engine “OFF” and the compressor and clutch not engaged, the blue “low-side” and red “high-side” gauges should show equal readings of approximately 80 to 120psi.
Engine Running Test
TIP: A manifold gauge set with a built-in sight glass (mentioned above) will save you diagnostic time as most A/C systems don’t have a sight glass built-in that the receiver-dryer on the top side of the machine.
With this attribute, you search for bubbling refrigerant oil and refrigerant in the sight glass on the manifold. Oil moving through the glass would indicate that the compressor and clutch are all engaged. Refrigerant is being transferred from the low-side through the A/C system from the refrigeration cycle.