2018 Subaru Forester A/C Refrigerant & Oil Specifications
AI-generated reference. Always verify torque values, fluid capacities, intervals, and procedures against the manufacturer's service manual or OEM repair information before performing work. Repairius is not liable for damage from acting on this content without verification.
Working on this 2018 Subaru Forester? Run just this one job through Repairius.
No big switch. Write the estimate, text it for approval, and get paid on your phone. Keep everything else the way it is.
14-day free trial · credit card required · cancel anytime
Quick Answer: 2018 Subaru Forester A/C Specs
- Refrigerant Type: HFO-1234yf
- Refrigerant Charge: 15.9 oz (450g)
- PAG Oil Type: PAG 46
- PAG Oil Capacity: 3.7 fl oz (110 ml)
- Low-Side Port Location: Near the firewall on the passenger side
- High-Side Port Location: In front of the condenser
Why R-1234yf Matters
The 2018 Subaru Forester uses R-1234yf refrigerant, which has a lower global warming potential than the R-134a used in older vehicles. This change was mandated by the EPA to reduce the environmental impact of automotive A/C systems. While R-1234yf is better for the environment, it is also more expensive and requires special equipment for service. You cannot use an R-134a machine on an R-1234yf system, and vice versa.
Recharge Procedure
A proper A/C recharge is not a simple top-off. The system must be evacuated with a vacuum pump to remove any air or moisture, which can cause damage to the A/C compressor. Once the system is evacuated, the correct amount of refrigerant must be added by weight, not by pressure. Overcharging or undercharging the system can cause cooling problems and damage to the A/C components.
Common A/C Problems for This Vehicle
- Compressor Failures: The A/C compressor is the heart of the system, and it is also one of the most common failure points. The compressor can fail due to a lack of lubrication, a refrigerant leak, or an electrical problem.
- Condenser Issues: The condenser is located in front of the radiator, and it is responsible for dissipating heat from the refrigerant. The condenser can be damaged by road debris, or it can develop leaks over time.
- Evaporator Leaks: The evaporator is located inside the dashboard, and it is responsible for cooling the air that blows into the cabin. The evaporator can develop leaks, which can cause a loss of cooling and a musty smell in the cabin.
When to Call a Pro
If you are not comfortable working on your own A/C system, it is best to leave it to a professional. A certified A/C technician will have the proper equipment and training to diagnose and repair any A/C problems you may be having.
Disclaimer: The information in this article is for general informational purposes only, and it is not a substitute for the advice of a qualified professional. Always consult with a certified A/C technician before working on your own A/C system. You must be EPA 609 certified to legally purchase and handle refrigerants.
Find a certified A/C shop on Repairius.
More specs for the 2018 Subaru Forester
Oil Capacity & Filter
Capacity, weight, filter PN, drain plug torque, change interval.
Fluid Type Specs
Engine oil, coolant, ATF, diff, brake, PS, DEF — with OEM spec numbers.
Coolant Capacity & Type
Total system capacity, OEM coolant spec, flush interval, bleed tips.
Transmission Fluid & Service
Trans model, fluid spec, capacity, filter PN, service interval.
Torque Specifications
Lug nuts, drain plug, caliper, axle nut, plug, key fasteners.
Brake Pad & Rotor Specs
Pad PNs, rotor size, min thickness, caliper torque.
Tire Size & Pressure
OEM size, cold psi, bolt pattern, wheel size, TPMS.
Battery Size & Group
Group size, CCA, AGM/flooded, dimensions, reset note.
Bulb Sizes (Headlight, Tail, Fog)
Headlight, fog, tail, turn, reverse, interior.
Factory Maintenance Schedule
Service intervals by mileage, severe-duty notes, known issues.
Towing Capacity & Payload
Max tow, payload, GVWR/GCWR, hitch class by trim.
Fuse Box Diagram & Amperage
Fuse box locations, layout, amps, and what each fuse controls.
Serpentine Belt Routing & Length
Belt routing, length, rib count, OEM + aftermarket PNs.
Wheel Alignment Specifications
Camber, caster, toe ranges (front & rear), adjustability notes.
Paint Color Codes
All factory colors with paint codes, sticker location, touch-up tips.
Wiper Blade Sizes
Driver/passenger/rear blade size, attachment, OEM + cross-refs.
Spark Plug Type & Gap
Plug PN, gap, torque, interval by engine.
Transmission & Axle Gear Ratios
Trans gear ratios, axle ratios, RPO codes, tow vs MPG impact.
Key Fob Programming
DIY programming steps, FCC ID, fob PN, battery, transponder.
Same spec — other model years
Maintenance & repair guides
2018 Subaru Forester Maintenance Schedule →
Available maintenance guidance; confirm the manufacturer schedule.
Repair planning references →
Plan the scope of work; detailed procedures need configuration-matched evidence.
Browse by make
Running an auto or diesel repair shop?
Compare Repairius to the shop software you're paying for
$99.99/month (first location included), unlimited users, 14-day free trial.