Checks, in order
- Compressor clutch engagementWith the engine running and A/C on max, watch the front of the compressor. The clutch plate should click in and spin. If it does not, check the fuse and relay.easy $ · under about $50
- Cabin air filter and airflowA clogged filter weakens airflow and makes the A/C feel weak. Replace it if it is dirty.easy $ · under about $50
- Condenser and fansCheck the condenser in front of the radiator for debris and bent fins. Make sure the fans run when the A/C is on.easy $ · under about $50
- Pressure and leak testHave a shop read the high and low side pressures. Low pressure points to a leak, and a dye test or electronic leak detector finds it.medium $$ · about $50 to $500
- Compressor replacementIf the compressor has failed, the system needs flushing and the receiver or drier and expansion device replaced to protect the new unit.hard $$$ · shop-level job, $500+
Applies to: 5th generation 4Runner, 2010 to 2024, with the 1GR-FE 4.0L V6 and the 5-speed automatic. Assumes the stock configuration; trim-specific items (KDSS, sunroof, A/C) are noted where they apply.
Tools and parts for these checks
Links below are affiliate links: toyotadata earns a commission from VEVOR and, as an Amazon Associate, from qualifying Amazon purchases, at no extra cost to you. Confirm fitment for your exact truck before you order.
| ITEM | USED FOR | BUY |
|---|---|---|
| A/C manifold gauge set | Reading high and low side pressures | Shop on Amazon |
| A/C UV leak detection light | Finding refrigerant leaks in systems with UV dye | Shop on Amazon |
| A/C vacuum pump and gauge set (R134a and R1234yf) | Pulling a vacuum after the system has been opened, before recharging | Shop on VEVOR |
| Digital multimeter | Voltage, ground and continuity checks | Shop on Amazon |
Other body & electrical problems on the 5th Gen 4Runner
More 5th Gen 4Runner problems
- Rust on the frame, flaking, or holes in the frame rails (Frame & Body)
- KDSS warning, fluid leak, or clunking and uneven ride on a KDSS truck (Steering & Suspension)
- Oil leak or oil smell from the front of the engine (Engine)
- Rough idle, shaking, or misfire with a flashing check engine light (Fuel & Ignition)
- Check engine light with P0171 or P0174, system too lean (Fuel & Ignition)
- Check engine light with P0420 or P0430, catalyst efficiency (Emissions)
All 16 5th Gen 4Runner symptoms in the interactive troubleshooter →
General guidance from owner experience. Confirm torque specs, fluid capacities and procedures in the factory service manual. Brakes, steering and anything structural: if in doubt, have a qualified shop inspect it before driving.