Question about Chrysler Town & Country
get an ecu from the junkyard and replace it. Also try shorting out the pressure sensor with a jumper wire- it sits on top of the evac/drier. If the compressor comes on, replace it.
Posted on Oct 26, 2008
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Jul 11, 2012 | Cars & Trucks
CAUTION The refrigerant used in A/C systems is an extremely cold substance. When exposed to air, it will instantly freeze any surface it comes in contact with, including your eyes. It is imperative to use eye and skin protection when working on A/C systems.
R-12 refrigerant is a chlorofluorocarbon which, when released into the atmosphere, contributes to the depletion of the ozone layer. Ozone filters out harmful radiation from the sun. Consult the laws in your area before servicing the air conditioning system. In some states it is illegal to perform repairs involving refrigerant unless the work is done by a certified technician. It is also likely that you will not be able to purchase R-12 without proof that you are properly trained and certified to work on A/C systems.
The refrigerant used in A/C systems is an extremely cold substance. When exposed to air, it will instantly freeze any surface it comes in contact with, including your eyes. Although normally non-toxic, refrigerant gas becomes highly poisonous in the presence of an open flame. One good whiff of the vapor formed by refrigerant can be fatal. Keep all forms of fire (including cigarettes) well clear of the air conditioning system. It has been established that the chemicals in R-12 (used on 1984-1993 models) contribute to the damage occurring in the upper atmosphere. 1994 models use ozone-friendly R-134a refrigerant. Under no circumstances should R-12 be allowed to enter an R-134a system, or vice versa. Never mix parts between the systems as they are not compatible. This includes O-rings and refrigerant oil. Servicing (recovery, evacuation and charging) of the A/C system, should be left to a professional certified mechanic with the proper equipment and related training.
A lot of A/C problems can be avoided by running the air conditioner at least once a week, regardless of the season. Simply let the system run for at least 5 minutes a week (even in the winter), and you'll keep the internal parts lubricated as well as preventing the hoses from hardening.
Checking For A/C Oil Leaks
Refrigerant leaks show up only as oily areas on the various components because the compressor oil is transported around the entire system along with the refrigerant. Look for oily spots on all the hoses and lines (especially on the hose and tube connections). If there are oily deposits, the system may have a leak, and you should have it checked by a qualified mechanic.
Check the A/C Compressor Belt
The compressor drive belt should be checked frequently for tension and condition. Refer to the information in this section on "Belts''.
Keep the A/C Condenser Clear
The condenser is mounted in front of the radiator (and is often mistaken for the radiator). It serves to remove heat from the air conditioning system and to cool the refrigerant. Proper air flow through the condenser is critical to the operation of the system.
Periodically inspect the front of the condenser for bent fins or foreign material (dirt, bugs, leaves, etc.). If any cooling fins are bent, straighten them carefully with needle nose pliers. You can remove any debris with a stiff bristle brush or hose.
REFRIGERANT LEVEL CHECKS
See Figures 1 and 2
Factory installed Toyota air conditioners have a sight glass for checking the refrigerant charge. The sight glass is on top of the receiver/drier which is located in the front of the engine compartment, on the right or left side of the condenser assembly (some models are in front of the condenser/some are located on side of engine compartment).
If your car is equipped with an aftermarket air conditioner, the following system check may not apply. Contact the manufacturer of the unit for instructions on system checks.
Fig. Fig. 2: Oil streaks (A), constant bubbles (B), or foam (C) are indicators that the system is low on refrigerant
See Figure 3
Generally described, this tool is a set of two gauges, a manifold and three hoses. By connecting the proper hoses to the car's system, the gauges can be used to "see'' the air conditioning system at work. Do not use the gauge set as a means for discharging the system.
Fig. Fig. 3: An example of a common manifold gauge set
DISCHARGING, EVACUATING AND CHARGING
Discharging, evacuating and charging the air conditioning system must be performed by a properly trained and certified mechanic in a facility equipped with refrigerant recovery/recycling equipment that meets SAE standards
May 07, 2012 | 1993 Toyota Tercel
STEPS TO CHARGING YOUR CARS COOLING SYSTEM:
STEP 1) Look under the hood of you car on the left side of your cars engine. There should be two stainless steel lines coming from a stainless steel cylinder to your cars compressor. The two lines have plastic dust caps on them sometimes they are blue or black. Usally the black has the larger diameter tubing that runs between the evaporator and the compressor. This will be the port that you hook the refrigerant hose up to.
STEP 2) Start your cars engine after you have secured the hose hook up to the air conditioner line port. Once the cars engine is running, turn your cars AC on to Max cool. Shake the can of coolant well. The gauge on the can of coolant should read in the blue but if it is in the green your air conditioners pressure will be between 0-25 pounds per square inch. This means you will have to add refrigerant to the compressor.
If your cars air conditioner pressure is in the blue. The system has the proper amount of refrigerant and you do not need to add. If the gauge reads in the yellow you may want to seek professional help because refrigerant is not what is wrong with the unit and is probably something more technical and most likely something that you do not want to attempt to do on your own. The red on the gauge means do not add any refrigerant at all and to seek professional help.
STEP 3) If the pressure of your air conditioning system is in the green it means it is safe to add the refrigerant. You should wait for your air conditioning compressor to switch on before squeezing the trigger to add the coolant. When the compressor switches off then release the trigger and repeat until your pressure gauge on the coolant can says that the coolant is in the proper range. If the needle on the gauge is in the top part of the blue you have successfully charged your cars air conditioning unit.
STEP 4) Release the attachment from the tubing port and replace the dust cap back in it's proper place and you are done. The cars air should be cool and your compressor should cut off and on less often. If problems persist you should consult a mechanic or someone that has experience with air conditioning systems.
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