INSPECTION PROCEDURE 3: When the A/C is Operating, Temperature Inside the Passenger Compartment does not Decrease (Cool Air not Emitted).: Diagnosis

WARNING: This page is about a different car, the 2005 Dodge Stratus and 2005 Chrysler Sebring. However, it is still accessible from the selected car via links, so may be relevant.

STEP 1. Check for refrigerant leaks.
Q: Is the refrigerant leaking?

YES : Repair. Then go to Step 6.

NO: Go to Step 2.

STEP 2. Check the dual pressure switch operation.

Remove the dual pressure switch connector and connect the high/low pressure side terminals located on the harness side as shown in the illustration.
Install a gauge manifold to the high-pressure side service valve of the refrigerant line. (Refer to REFILLING OF OIL IN THE A/C SYSTEM .)

When the high/low pressure sides of the dual pressure switch are at operation pressure (ON) and the resistance is less than 2 ohms between the respective terminals, then the condition is normal. If open loop, replace the switch.

DUAL PRESSURE SWITCH CHECK

ITEM	SWITCH POSITION
ITEM	OFF to ON	ON to OFF
Low-pressure side kPa (psi)	195 - 250 (28.3 - 36.2)	176 - 216 (25.5 - 31.3)
High-pressure side kPa (psi)	2,350 - 2,950 (340.9 - 427.9)	3,140 - 3,340 (455.5 - 484.5)

Q: Is the dual pressure switch operating properly?

YES : Go to Step 3.

NO: Replace the switch. Then go to Step 6.

Fig 1: Checking Dual Pressure Switch

Courtesy of DAIMLERCHRYSLER CORPORATION

STEP 3. Check the refrigerant-temperature switch operation.
When the A/C is off, check that there is less than 2 ohms between the refrigerant-temperature switch terminals.

Q: Is the circuit open loop?

YES : Replace the switch. Then go to Step 6.

NO: If less than 2 ohms, go to Step 4.

Fig 2: Checking Refrigerant-Temperature Switch
Courtesy of DAIMLERCHRYSLER CORPORATION
STEP 4. Measure the automatic compressor controller terminal voltage.
Refer to CHECK AT AUTOMATIC COMPRESSOR CONTROLLER TERMINAL .

Q: Is the automatic compressor controller terminal voltage in good condition?

YES : Go to Step 5.

NO: Replace the automatic compressor controller. Then go to Step 6.
STEP 5. Measure the engine control module < M/T >/the powertrain control module < A/T > terminal voltage.
Q: Is the voltage in good condition?

YES : Go to Step 6.

NO: Replace the ECM or PCM. Then go to Step 6.
STEP 6. Retest the system.
Q: Is the cool air discharged?

YES : The procedure is complete. (If no malfunctions are found in all steps, an intermittent malfunction is suspected. Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTIONS .)

NO: Go to Step 1.