Having problems with your 1997 Jeep Grand Cherokee ?

Air conditioning fan stopped running - 1997 Jeep Grand Cherokee

Posted / edited by AnonymousUser on : 21-01-2019

Answers :

System Inspection
\015\012 Although the A/C system should\015\012 not be serviced by the do-it-yourselfer, preventive maintenance can \015\012be practiced and A/C system inspections can be performed to help \015\012maintain the efficiency of the vehicle's A/C system. For A/C system \015\012inspection, perform the following: The easiest and often most important \015\012check for the air conditioning system consists of a visual inspection \015\012of the system components. Visually inspect the air conditioning system\015\012 for refrigerant leaks, damaged compressor clutch, abnormal compressor\015\012 drive belt tension and/or condition, plugged evaporator drain tube, \015\012blocked condenser fins, disconnected or broken wires, blown fuses, \015\012corroded connections and poor insulation.
\015\012 CHECKING FOR OIL LEAKS Refrigerant\015\012 leaks show up as oily areas on the various components because the \015\012compressor oil is transported around the entire system along with the \015\012refrigerant. Look for oily spots on all the hoses and lines, and \015\012especially on the hose and tubing connections. If there are oily \015\012deposits, the system may have a leak, and you should have it checked \015\012by a certified air conditioning specialist. \015\012
\015\012 \015\012\015\012 \015\012\015\012 \015\012\015\012 \015\012\015\012 \015\012\015\012 \015\012\015\012 \015\012Fig. 1: Run your hand \015\012along the underside of all hose connections and check for leaks. If \015\012you find a leak, have it fixed by a certified air conditioning \015\012specialist.\015\012
\015\012 check%20ac%20leak.jpg\015\012 \015\012 \015\012 \015\012 \015\012 \015\012 \015\012\015\012 \015\012\015\012 KEEPING THE CONDENSER CLEAR Periodically\015\012 inspect the front of the condenser for bent fins or foreign material \015\012(dirt, bugs, leaves, etc.). If any cooling fins are bent, straighten \015\012them carefully. You can remove any debris with a stiff bristle brush.
\015\012 \015\012\015\012 \015\012\015\012 \015\012\015\012 \015\012\015\012 \015\012\015\012 \015\012\015\012 \015\012Fig. 1: The position of the\015\012 condenser in front of the radiator makes it particularly susceptible \015\012to collecting debris. Periodically, remove the accumulated bugs, \015\012leaves and other trash from the condenser.\015\012 ac%202.gif
\015\012 \015\012 \015\012 \015\012 \015\012 \015\012\015\012 \015\012\015\012 CHECKING THE REFRIGERANT LEVEL There\015\012 are two ways to check refrigerant level. On vehicles equipped with \015\012sight glasses, checking the refrigerant level is a simple matter. Many \015\012late model vehicles, however, do not have a sight glass, and you have \015\012to check the temperature of the lines to determine the refrigerant \015\012level.
\015\012 With Sight Glass The sight\015\012 glass is normally located in the head of the receiver/drier. The \015\012receiver/drier is not hard to locate. It's a large metal cylinder that \015\012looks something like a fire extinguisher. Sometimes the sight glass is\015\012 located in one of the metal lines leading from the top of the \015\012receiver/drier. Once you've found it, wipe it clean and proceed as \015\012follows:
\015\012 \015\012\015\012 \015\012\015\012 \015\012\015\012 \015\012
  1. With the engine and the air conditioning \015\012system running, look for the flow of refrigerant through the sight \015\012glass. If the air conditioner is working properly, you'll be able to \015\012see a continuous flow of clear refrigerant through the sight glass, \015\012with perhaps an occasional bubble at very high temperatures.
  2. \015\012
  3. Cycle the air conditioner on and off to make\015\012 sure what you are seeing is clear refrigerant. Since the refrigerant \015\012is clear, it is possible to mistake a completely discharged system for\015\012 one that is fully charged. Turn the system off and watch the sight \015\012glass. If there is refrigerant in the system, you'll see bubbles \015\012during the off cycle. If you observe no bubbles when the system is \015\012running, and the airflow from the unit in the vehicle is delivering cold\015\012 air, everything is OK.
  4. \015\012
  5. If you observe bubbles in the sight glass \015\012while the system is operating, the system is low on refrigerant. Have \015\012it checked by a professional.
  6. \015\012
  7. Oil streaks in the sight glass are an \015\012indication of trouble. Most of the time, if you see oil in the sight \015\012glass, it will appear as a series of streaks, although occasionally it\015\012 may be a solid stream of oil. In either case, it means that part of \015\012the charge has been lost.
\015\012 \015\012 \015\012 \015\012\015\012 \015\012\015\012 \015\012
  1. \015\012 \015\012\015\012 \015\012\015\012 \015\012\015\012 \015\012Fig. 1: Oils streaks (A),\015\012 constant bubbles (B) or foam (C) indicate there is not enough \015\012refrigerant in the system. Occasional bubbles during the initial \015\012operation are normal. A clear sight glass indicates a proper charge of\015\012 refrigerant or no refrigerant at all, which can be determined by the \015\012presence of cold air at the outlets in the vehicle. If the glass is \015\012clouded with a milky white substance, have the receiver/dryer checked \015\012by a certified air conditioning specialist.\015\012 ac%203.jpg
    \015\012 \015\012 \015\012 \015\012
\015\012 Without Sight Glass\015\012 On vehicles that are not equipped with sight glasses, \015\012it is necessary to feel the temperature difference in the inlet and \015\012outlet lines at the receiver/drier to gauge the refrigerant level. Use\015\012 the following procedure: \015\012 \015\012
  1. Locate the receiver/drier. It \015\012will generally be up front near the condenser. It is shaped like a \015\012small fire extinguisher and will always have two lines connected to \015\012it. One line goes to the expansion valve and the other goes to the \015\012condenser.
  2. \015\012
  3. With the engine and the air \015\012conditioner running, hold a line in each hand and gauge their relative\015\012 temperatures. If they are the same approximate temperatures, the \015\012system is correctly charged.
  4. \015\012
  5. If the line from the expansion \015\012valve to the receiver/drier is a lot colder than the line from the \015\012receiver/drier to the condenser, then the system is overcharged. It \015\012should be noted that this is an extremely rare condition.
  6. \015\012
  7. If the line that leads from the \015\012receiver/drier to the condenser is a lot colder than the other line, \015\012the system is undercharged.
  8. \015\012
  9. If the system is undercharged or overcharged, have it checked by a professional air conditioning mechanic.
\015\012 \015\012\015\012 \015\012 \015\012 \015\012 \015\012 \015\012 \015\012Fig. 3: Checking the refrigerant charge if the system has no sight glass.\015\012 \015\012\015\012 \015\012ac%204.jpg
Repair Help & Product Troubleshooting for 1997 Jeep Grand Cherokee

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