hvac

AC Hose - High Side

for 2021 Toyota Camry 2.5L I4 · FWD

Difficulty

Moderate

Time

1.5 h

Tools

Steps

🤖AI-generated, not yet human-verified. This walkthrough was produced by AI and may contain errors. Treat it as a guide, cross-check every step and torque value against the manufacturer's service manual, and stop if anything looks unsafe. This is a moderate-risk job — take extra care.

This procedure covers the replacement of the high-side AC hose on a 2018-2024 Toyota Camry with the 2.5L I4 engine, including refrigerant recovery, hose replacement, and system recharge.

Warnings

⚠️AC refrigerant must be recovered by a certified technician using approved equipment. Releasing refrigerant into the atmosphere is illegal and harmful to the environment.

⚠️AC system operates at high pressure. Never loosen fittings while the system is pressurized.

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

ℹ️The AC system must be evacuated and recharged using professional equipment. This cannot be done properly without a vacuum pump and refrigerant recovery machine.

Tools required

AC refrigerant recovery machineEssential

Torque wrenchEssential

10mm socket and ratchetEssential

12mm wrenchEssential

14mm wrenchEssential

Refrigerant leak detectorEssential

AC manifold gauge setEssential

Vehicle lift or jack stands

PAG oil applicator or syringeEssential

O-ring pick set

Parts

AC high-side hose assembly × 1 — Use OEM specification
AC line O-rings × 4 — Use OEM specification
R-134a refrigerant × 1 — Verify system capacity on underhood label

Fluids

PAG 46 compressor oil — 0.1 qt

Preparation

Park vehicle on level surface and engage parking brake
Allow engine to cool completely if recently operated
Disconnect negative battery terminal and wait 3 minutes for airbag system to discharge
Locate the AC service ports and verify refrigerant type on underhood label (should be R-134a)
Note the refrigerant capacity from the underhood label for proper recharge amount

Procedure

1
Recover refrigerant from AC system
Connect AC recovery machine to both high and low-side service ports. Follow recovery machine instructions to completely evacuate all refrigerant from the system. Wait until recovery machine indicates system is empty and record the amount of refrigerant recovered for recharge reference.
2
Access engine compartment components
Remove the engine cover by pulling upward on the four clips. This provides access to the AC lines running from the compressor. The high-side hose runs from the compressor to the condenser at the front of the vehicle.
3
Disconnect high-side hose at compressor
Locate the high-side hose connection at the compressor on the driver's side of the engine. Using a 14mm wrench, loosen and remove the bolt securing the high-side hose to the compressor. Disconnect the hose and immediately cap both openings to prevent contamination. Remove and discard the old O-rings from the fitting.
Torque spec
AC Line Fittings20 Nm (15 lb-ft)
4
Disconnect high-side hose at condenser
Raise and support the vehicle if needed for better access. Locate where the high-side hose connects to the condenser at the front of the vehicle, typically accessed from underneath. Using a 12mm wrench, loosen and remove the bolt securing the hose to the condenser. Disconnect the hose and cap the condenser opening. Remove and discard the old O-rings.
5
Remove hose mounting brackets
The high-side hose is secured to the body or frame with one or more mounting brackets. Using a 10mm socket, remove the bolts securing these brackets. Note the routing of the old hose for proper installation of the replacement.
Torque spec
Mounting Bracket Bolts24 Nm (18 lb-ft)
6
Remove high-side hose assembly
Carefully remove the high-side hose assembly from the vehicle, taking care not to damage surrounding components. Inspect the routing path and verify the replacement hose matches the original configuration.
7
Prepare new hose assembly
Unpack the new high-side hose and verify it matches the original. Install new O-rings on both ends of the hose. Apply a thin coating of PAG 46 compressor oil to all O-rings to ensure proper sealing and prevent damage during installation. Add approximately 10ml (2 teaspoons) of fresh PAG 46 oil into the new hose to replace oil lost during service.
8
Route and position new hose
Route the new high-side hose along the same path as the original, ensuring it does not contact sharp edges or moving components. Position the hose so both end fittings align properly with their connection points at the compressor and condenser.
9
Install hose mounting brackets
Secure the hose mounting brackets to the body or frame. Torque the mounting bracket bolts to specification. Ensure the hose is properly supported and will not vibrate against other components.
Torque spec
Mounting Bracket Bolts24 Nm (18 lb-ft)
10
Connect hose at condenser
Remove the cap from the condenser fitting. Align the high-side hose with the condenser connection and install the bolt finger-tight. Verify the O-rings are properly seated, then torque the fitting bolt to specification using a torque wrench.
Torque spec
AC Line Fittings20 Nm (15 lb-ft)
11
Connect hose at compressor
Remove the cap from the compressor fitting. Align the high-side hose with the compressor connection and install the bolt finger-tight. Verify the O-rings are properly seated, then torque the fitting bolt to specification using a torque wrench.
Torque spec
AC Line Fittings20 Nm (15 lb-ft)
12
Evacuate AC system
Connect a vacuum pump to the AC service ports. Evacuate the system for a minimum of 45 minutes to remove all moisture and air. The system should hold a vacuum of at least 29 inches of mercury. After evacuation, close valves and observe for 10 minutes to verify the system holds vacuum, indicating no leaks are present.
13
Recharge AC system
Using AC recovery/recharge equipment or manifold gauges, recharge the system with the exact amount of R-134a refrigerant specified on the underhood label. Do not overcharge or undercharge the system. Follow proper refrigerant charging procedures, starting with low-side port with engine running and AC on maximum cold.
14
Leak test system
With the system fully charged, use a refrigerant leak detector to check all connection points, especially the newly installed fittings at the compressor and condenser. Check for any signs of refrigerant leakage. If leaks are detected, recover refrigerant, repair the leak, and repeat evacuation and recharge procedures.

Reassembly

Reinstall the engine cover by pressing down on all four mounting clips until fully seated
Reconnect the negative battery terminal and tighten securely
Lower the vehicle if raised

Verification

Start the engine and turn AC to maximum cold with fan on high speed
Verify cold air is blowing from all vents within 2-3 minutes of operation
Check that the compressor clutch engages and disengages properly
Verify AC pressures are within normal operating range using manifold gauges (typically 25-45 PSI low side, 200-250 PSI high side at ambient temperature)
Inspect all connections for signs of oil leakage which would indicate refrigerant leaks
Verify no unusual noises from the AC compressor or hose routing
Test AC performance over a 10-minute drive cycle to ensure consistent cooling