hvac

AC High Pressure Switch

for 2021 Toyota RAV4 2.5L I4 · AWD

Difficulty

Moderate

Time

30 min

Tools

Steps

This procedure covers the replacement of the AC high pressure switch on a 2019-2024 Toyota RAV4 with the 2.5L I4 gas engine, including refrigerant recovery, switch replacement, and system recharge.

Warnings

⚠️AC refrigerant must be recovered by certified personnel using approved equipment. Releasing refrigerant into the atmosphere is illegal and environmentally harmful.

⚠️AC system operates at high pressure. Do not disconnect fittings without fully recovering refrigerant first.

⚠Wear safety glasses and gloves when working with AC system components. Refrigerant contact can cause frostbite.

ℹ️2019-2021 models typically use R-134a refrigerant, while 2022+ models may use R-1234yf. Verify your system type before beginning work.

Tools required

AC refrigerant recovery machineEssential

Torque wrenchEssential

17mm wrenchEssential

10mm socket and ratchet

Vacuum pumpEssential

AC manifold gauge setEssential

Safety glassesEssential

Shop towels

Parts

AC high pressure switch × 1 — Use OEM specification
AC system O-rings × 2 — Use OEM specification

Fluids

R-134a or R-1234yf refrigerant (depending on model year)
PAG oil

Preparation

Ensure engine is off and cooled completely
Park vehicle on level surface and engage parking brake
Verify you have the correct replacement AC high pressure switch for your specific model year
Connect AC recovery machine according to manufacturer instructions

Procedure

1
Recover AC refrigerant
Using certified AC recovery equipment, connect to the high and low side service ports and completely recover all refrigerant from the system. Follow recovery machine instructions and local regulations. Record the amount of refrigerant and oil recovered for proper recharging.
2
Locate high pressure switch
Open the hood and locate the AC high pressure switch on the high pressure line near the receiver/dryer on the passenger side of the engine bay. The switch has a two-wire electrical connector and threads into the high pressure line.
3
Disconnect electrical connector
Press the release tab on the electrical connector and carefully disconnect it from the high pressure switch. Move the connector aside to provide clearance for switch removal.
4
Remove high pressure switch
Using a 17mm wrench, carefully unthread the high pressure switch from the high pressure line. Remove the switch completely and inspect the sealing O-ring. Small amounts of residual refrigerant may escape; this is normal after recovery.
5
Prepare new switch
Remove the old O-ring from the high pressure line port. Install a new O-ring onto the new high pressure switch. Lightly coat the O-ring with clean PAG oil compatible with your system refrigerant type to ensure proper sealing.
6
Install new high pressure switch
Thread the new high pressure switch into the high pressure line port by hand until fully seated. Tighten to the specified torque using a torque wrench. Do not overtighten as this may damage the O-ring seal or threads.
Torque spec
AC Line Fittings20 Nm (15 lb-ft)
7
Reconnect electrical connector
Reconnect the two-wire electrical connector to the new high pressure switch. Ensure the connector locks into place with an audible click.
8
Evacuate AC system
Connect a vacuum pump to the AC system service ports. Evacuate the system to at least 29 inches of mercury (Hg) for a minimum of 30 minutes to remove all air and moisture. Monitor for vacuum hold to verify system integrity.
9
Recharge AC system
Using the AC manifold gauge set and appropriate equipment, recharge the system with the correct type and amount of refrigerant as specified on the underhood label. Add the amount of PAG oil that was removed during recovery. For 2.5L I4 FWD models, typical capacity is approximately 17-19 oz of refrigerant, but always verify with the vehicle-specific label.
10
Test high pressure switch operation
Start the engine and turn the AC system to MAX cooling with the blower on high. Allow the system to run for 5-10 minutes. Monitor system pressures with the gauge set. The high pressure switch should allow compressor operation when pressures are within normal range (typically 200-250 psi on high side at idle).

Reassembly

No disassembly was required beyond the switch itself
Ensure all electrical connections are secure and properly routed
Close hood after verifying proper AC operation

Verification

Start engine and activate AC system to verify compressor engages and disengages properly
Verify cold air is being produced from cabin vents
Check for refrigerant leaks around the new high pressure switch using an electronic leak detector
Monitor AC system pressures to ensure they remain within normal operating range
Verify no warning lights are illuminated on the instrument cluster
Test AC system operation at various blower speeds and temperature settings