2PCS 13500120 Relay 12V 4-Pin ISO Mini, OE# 15-51279, Compatible with Buick Lacrosse 2010-2016, Fits Chevrolet Trax 2013-2020, Fits Cadillac XT5 2017, Fits GMC Acadia 2017

13500120 12V 4-Pin Gray Multi-Purpose RelayDirect-fit replacement for OE 13500120 / ACDelco 15-51279. Used to switch power to factory systems such as the radiator cooling fan or A/C in the under-hood fuse/relay box.Key SpecificationsVoltage: 12VTerminals: 4 (male blades)Form factor: ISO 950 power mini, gray housingPrimary OE#: 13500120; Cross: ACDelco/GM Genuine Parts 15-51279Typical circuits: radiator cooling fan, A/C, accessory power (check owner’s manual)Installation & LocationMounts in the under-hood fuse/relay box (engine compartment)Disconnect battery negative before service; pull old relay straight up, seat new relay fullyAlways match by OE number and cavity chart in your vehicleFitment (verify by OE# and fuse panel chart)Buick: LaCrosse 2010–2016; Regal 2011–2015; Encore 2017–2022Chevrolet: Trax 2013–2020; Impala 2014–2016; Malibu Limited 2016 (Malibu 2014 noted in catalogs)Cadillac: XT5 2017GMC: Acadia 2017Symptoms This Relay Can AddressCooling fan fails to run or runs constantlyA/C compressor not engagingIntermittent accessory power due to stuck or weak relay contactsRelated Items (may be used in the same fuse box)Black multi-purpose relay: 135001264-terminal relay (variant in some applications): 13500114Note: Vehicle engineering changes can vary by trim/engine. For best results, confirm by OE number and your fuse/relay legend.

• Specs & OE/Interchange — 12V, 4-terminal (male blades) gray ISO 950 power mini relay; direct replacement for OE# 13500120; cross reference ACDelco/GM Genuine Parts 15-51279. Designed for fan/A/C/accessory circuits.
• Location & Function — Installs in the under-hood fuse/relay box; used to switch power to vehicle accessories (e.g., radiator cooling fan or A/C). Replace if you have inoperative fan/A/C or intermittent accessory power.
• Compatible with Buick (by year) — LaCrosse 2010-2016, Regal 2011-2015, Encore 2017-2022. (Always confirm by OE# and owner’s manual.)
• Compatible with Chevrolet (by year) — Trax 2013-2020, Impala 2014-2016, Malibu Limited 2016 (Malibu 2014 noted by catalog).
• Compatible with Cadillac & GMC — Cadillac XT5 2017; GMC Acadia 2017.
• What it can solve — Common signs include cooling fan not engaging, A/C not cycling, or accessories stuck ON/OFF due to a failing relay. Replacing restores proper switched power
• Related/Complementary parts for the same fuse box (check your vehicle’s chart) — Black multi-purpose relay 13500126 and 4-terminal relay 13500114 are often used in adjacent positions on some GM applications. (Sold separately.)