Accessory Installation Guide
2022MY WRX Engine Block Heater | A091SVC010 |
Installation Instructions
Part Number: A091SVC010
Description: Engine Block Heater, WRX
Tools Required
3/8” & 1/2” Drive ratchets
Socket extension 1/2” drive (6” long)
3/8” Drive extension (3” long)
1/2” Breaker bar
14mm socket-shallow (1/2” drive)
14mm wrench
12mm wrench
E10 TorxSocket (for exhaust studs)
Adjustable pliers (large) / 12 Point Crows Foot 1 7/16” inch
Screwdriver (flat blade)
Coolant drain pan
Coolant (mixed to OE specifications)
High temperature gasket compound
NOTE: It is required that the exhaust flange gaskets and rear donut gasket be replaced . These items are sold separately.
Installation
1-1
Disconnect Negative (-) battery cable from the battery sensor terminal. Hold the battery sensor carefully when removing the 10mm nut. Remove engine under covers (if equipped) and drain the cooling system
1-2
Wedge out exhaust manifold by removing all bolt and exhaust studs as per shop manual. Take off turbocharger heat shielding to aid manifold removal. NOTE: Be careful to not damage the oil pan, heat shielding or waste gate actuator in the removal process.
1-2.1
Remove Turbocharger heat shielding to help remove manifold.
1-3
Locate 36mm threaded core plug on RH side of engine and insert 14mm hex bit into the core plug and loosen. Remove core plug and drain remaining coolant. CAUTION: Coolant may be hot. NOTE: Clearance is tight avoid damaging engine block.
1-4
Install gasket (1) and coat threads of heater body with high temperature gasket compound (2).
1-5
Install engine block heater into core plug opening and tighten with adjustable pliers or a 12 Point Crows foot (1 7/16”) until gasket is seated completely to engine block. Tighten the heater an additional 60 +/‐10 degrees to acquire a torque of 90 +/‐0.5 [N‐m] or 66 +/‐0.5 [ft‐lbs].
CAUTION: Failure to follow proper tightening procedures may allow coolant to leak onto the hot exhaust pipe and cause a fire, resulting in serious personal injury and property damage.
1-6
Plug harness into heater element. Orient orange connector towards the front by twisting the orange connector inside the heater. Inside of heater can be rotated relative to the outer body.
1-7
Using the gold high temperature wire tie provided, attach the block heater harness to the taped section of coolant line. Route harness forward towards the camshaft housing. NOTE: Ensure the harness is not pressed against the coolant line rubber hose. Harness should be curved similar to the yellow line shape shown above.
1-8
Attach the engine block heater harness with a second gold high temperature zip tie to the Turbocharger wastegate actuator harness (black harness) at the indicated white tape mark.
Note: Ensure that the block heater harness does not make contact with the engine casting or the exhaust manifold.
1-9
Attach third gold zip tie to the engine block heater harness where the tape mark meets the main vehicle ECU harness towards the passenger side of the chassis frame rail. Feed plug and harness through the side of the radiator foam directing the harness towards the front lower grille.
1-10
Attach the 4thgold wire zip tie to the engine block heater harness along the ambient temperature sensor harness. CAUTION: Ensure one of the two black sleeved portions of the engine block heater harness is the portion of the harness that is contacting the side of the metal casing of the radiator to prevent melting any harness components/wires.
1-11
Route the engine heater harness to the passenger side of the lower air intake opening. Using the male plug protector attach the male plug to the grille work.
1-12
Re-install exhaust system and engine covers (if equipped). Refill coolant.
A091SVC010
- Genuine Subaru
Engine Block Heater A091SSG001 (supersedes A091SSG000) - 2014-2018 Forester
- 2014-2016 Crosstrek Hybrid models
- 2015-2019 Outback 2.5 2015-2019 Legacy 2.5
- Warms engine coolant to promote easier starting in extreme cold. Plugs into household electrical outlet
- Engine Block Heater kit
- Genuine Subaru Part Number: A091SXC001 (Replaces A091SXC000)
- Ascent 2019 2020 2021 2022 2023 2024 2025 2026
- Warms engine coolant to promote easier starting in extreme cold conditions. Plugs into a a household electrical outlet.
- Plugs into a a household electrical outlet.
- Rapid Engine Preheating-In severe winter,this oil pan heater pad can raise the engine oil temperature to the optimal starting level in just 5 minutes.It significantly improves lubricating oil fluidity,reduces cold-start wear, and extends engine lifespan
- Smart Temperature Control Protection-Equipped with a built-in automatic constant temperature controller,our engine heater pad automatically powers off when the temperature reaches 194°F (90°C) and resumes heating when it drops below 122°F (50°C).This effectively prevents overheating risks and ensures safe use
- Self-Adhesive & Easy Installation-The back of engine block heater pad is equipped with strong Super Strong adhesive.Simply clean the metal surface,peel off the protective film,and paste it firmly.It is suitable for metal surfaces such as engine oil pans,transmissions,and fuel tanks
- Safety Usage Reminder -This engine heater pad is ONLY for use on metal surfaces.Do not stick it on plastic parts or near air inlets.Ensure the surface is clean and free of oil stains before use.It is recommended to apply high-temperature sealant around the edges to enhance adhesion (sealant not included)
- Convenient Use & Comprehensive After-Sales Service-Our block heater for diesel engine comes with a 68-inch (approximately 1.7 meters) UL-certified power cord.The plug is standard,allowing easy connection to household sockets.It is convenient to use without the need for modifications.Covered with high-grade silicone,it features oil resistance,acid resistance, water resistance,and low-temperature resistance.It adapts to various harsh environments,offering a long service life and high reliability
- Easy to Use: Clean the surface; Peel off the backing paper in brown color; apply the silicone heater pad to the surface cleaned making sure no gap or air bubbles trapped under the pad. Plug power cord into any wall outlet. Note: The engine heating pad is designed to be used on the metal surface to heat the fluid, and do not use it on any plastic surface on the engine
- Keep the Engine Warm: In every cold winter, using this heater and battery heating pad can quickly start the engine to maintain good engine oil temperature and improve engine performance. Use the silicone battery heater pad to heat up engine oil about 15 minutes. The oil temperature will be heated up to 194 degrees Fahrenheit (90 ℃), which will be easy to start your car
- Temperature Protection: When the temperature exceeds 194 F/90 C, the universal heating pad will automatically turn off. When the temperature drops to around 40 C, restart heating to avoid safe issues caused by high temperatures
- Features: Silicone rubber heating board is composed of silicone rubber and glass fiber cloth, high insulation performance, safe use. It is wear -resistant, heat -resistant, waterproof and oil -proof, not easy to be corroded, which can have a longer service life. Us standard plug, high power 120V 300w, line length 1.5m, Larger size (5.91*7.87inch), fast heating
- WIDELY USE: The silicone heater pad is widely use on RVs, campers, trailers, boats, and ships in winter, which is installed in engine oil pan, oil tank, reservoir, transmission oil pan and so on
Last update on 2026-05-27 / Affiliate links / Images from Amazon Product Advertising API
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Installation Instructions Part Number: A091SVC010 Description: Engine Block Heater, WRX (Kit Contents) Tools Required Icon Legends / Cautions Description Issue Date Page Engine Block Heater, WRX 1 9/20/2021 Subaru of America 1 / 5 : Remove/Disconnect : Install : Critical Location 1) Read all instructions before proceeding with installation. If uncomfortable performing any procedures, have installation performed by a Subaru dealer technician. 2) Take care not to damage vehicle components during removal and installation. 3) Route wiring so that it does not rub against any sharp edges. o 3/8” & 1/2” Drive rachets o Socket extension 1/2” drive (6” long) o 3/8” Drive extension (3” long) o 1/2” Breaker bar o 14mm socket- shallow (1/2” drive) o 14mm wrench o 12mm wrench o E10 Torx Socket (for exhaust studs) o Adjustable pliers (large) / 12 Point Crows Foot 1 7/16” inch o Screwdriver (flat blade) o Coolant drain pan o Coolant (mixed to OE specifications) o High temperature gasket compound o NOTE: It is required that the exhaust flange gaskets and rear donut gasket be replaced . These items are sold separately. A Block Heater Element w/ Gasket B Heater Harness with Integrated Clip C (4X) Gold High Temp Wire Ties Installation Instructions Installation Description Issue Date Page 2022 WRX Engine Block Heater 1 9/20/2021 Subaru of America 2 / 5 Disconnect Negative (-) battery cable from the battery sensor terminal. Hold the battery sensor carefully when removing the 10mm nut. Remove engine under covers (if equipped) and drain the cooling system 1-1 1-2 Locate 36mm threaded core plug on RH side of engine and insert 14mm hex bit into the core plug and loosen. Remove core plug and drain remaining coolant. CAUTION: Coolant may be hot. NOTE: Clearance is tight avoid damaging engine block. 1- 2.1 1-3 Part Number: A091SVC010 Description: Engine Block Heater, WRX Wedge out exhuast manifold by removing all bolt and ehxaust studs as per shop manual. Take off turbocharger heat shielding to aid manifold removal. NOTE: Be careful to not damage the oil pan, heat shielding or waste gate accuator in the removal process. Remove Turbocharger heat shielding to help remove manifold. Installation Instructions Installation Description Issue Date Page 2022 WRX Engine Block Heater 1 9/20/2021 Subaru of America 3 / 5 1-4 1-5 1-6 1-7 Part Number: A091SVC010 Description: Engine Block Heater, WRX Install engine block heater into core plug opening and tighten with adjustable pliers or a 12 Point Crows foot (1 7/16”) until gasket is seated completely to engine block. Tighten the heater an additional 60 +/- 10 degrees to acquire a torque of 90 +/- 0.5 [N-m] or 66 +/- 0.5 [ft-lbs]. CAUTION: Failure to follow proper tightening procedures may allow coolant to leak onto the hot exhaust pipe and cause a fire, resulting in serious personal injury and property damage. Plug harness into heater element. Orient orange connector towards the front by twisting the orange connector inside the heater. Inside of heater can be rotated relative to the outer body. Using the gold high temperature wire tie provided, attach the block heater harness to the taped section of coolant line. Route harness forward towards the camshaft housing. NOTE: Ensure the harness is not pressed against the coolant line rubber hose. Harness should be curved similar to the yellow line shape shown above. Installation Instructions Installation Description Issue Date Page 2022 WRX Engine Block Heater 1 9/20/2021 Subaru of America 4 / 5 1-8 1-9 1-10 Attach the engine block heater harness with a second gold high temperature zip tie to the Turbocharger wastegate actuator harness (black harness) at the indicated white tape mark. Note: Ensure that the block heater harness does not make contact with the engine casting or the exhaust manifold. Part Number: A091SVC010 Description: Engine Block Heater, WRX Attach third gold zip tie to the engine block heater harness where the tape mark meets the main vehicle ECU harness towards the passenger side of the chassis frame rail. Feed plug and harness through the side of the radiator foam directing the harness towards the front lower grille. 1-11 3 Attach the 4th gold wire zip tie to the engine block heater harness along the ambient temperature sensor harness. CAUTION: Ensure one of the two black sleeved portions of the engine block heater harness is the portion of the harness that is contacting the side of the metal casing of the radiator to prevent melting any harness components/wires. 4 Route the engine heater harness to the passenger side of the lower air intake opening. Using the male plug protector attach the male plug to the grille work. Installation Instructions Installation Description Issue Date Page 2022 WRX Engine Block Heater 1 9/20/2021 Subaru of America 5 / 5 1-12 1-13 1-14 Part Number: A091SVC010 Description: Engine Block Heater, WRX 1-15 Re-install exhaust system and engine covers (if equipped). Refill coolant.
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