Advance Truck Parts USA 79PSL3-4 high pressure A/C switch for R134a refrigerant featuring a red connector housing and a metallic threaded base on a plain background

Advance Truck Parts USA branded studio angled overview of the high pressure air conditioning switch

Advance Truck Parts USA branded studio close-up view highlighting the 2-pin red connector housing of the A/C pressure switch

ATP 79PSL3-4 Paccar Switch Fan Override Normally Close

Name: ATP 79PSL3-4 Paccar Switch Fan Override Normally Close
Brand: Advance Truck Parts USA
SKU: W029012
Price: 24.69 USD
Availability: InStock

Advance Truck Parts USA

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Description

Key Highlights

Direct Replacement: Designed specifically for Paccar & Kenworth climate control fan override systems.
Normally Closed (N.C.): High-pressure safety cutoff engineered for R134a refrigerant systems.
12-Month Warranty: Backed by the official Advance Truck Parts USA 1-year replacement warranty.
Fast Shipping: Same-day shipping available directly from Advance Truck Parts USA.

Product Description

Ensure optimal A/C system performance and engine cooling protection with the premium 79PSL3-4 High-Pressure A/C Fan Override Switch from Advance Truck Parts USA. Built to rigid heavy-duty specifications, this switch monitors R134a refrigerant system pressure in Paccar and Kenworth commercial trucks, automatically signaling the engine fan to engage when pressure reaches critical thresholds.

Constructed from durable, corrosion-resistant materials, Advance Truck Parts USA products deliver long-lasting, dependable switching reliability under demanding highway conditions.

Technical Specifications

Part Number / SKU	79PSL3-4
Brand	Advance Truck Parts USA
Function	High-Pressure A/C Fan Override Switch
Circuit State	Normally Closed (N.C.)
Thread Size	Female M10 x 1.25 Metric Thread
Terminal Count	2-Pin Connector
Refrigerant Compatibility	R134a
Warranty	1-Year Replacement Warranty (Advance Truck Parts USA)

Vehicle Fitment & Notes

Applications: Compatible with Paccar and Kenworth heavy-duty trucks equipped with matching switch configurations.
Pigtail Harness Notice: Need a fresh connector? Browse the Advance Truck Parts USA catalog for matching 2-pin pigtail harnesses.

Note: For pigtail use , 79PSL3-4 Pigtail

Shipping information

Fast Shipping & Local Pickup

Keeping your business moving is time-sensitive. We process
and ship orders quickly to keep your downtime to a minimum.

Same-Day Shipping Cutoffs

Monday – Friday: Order by 5:30 PM ET
Saturday: Order by 11:30 AM ET

Free Local Pickup

Location: Sunrise, Florida
Ready Time: Free 1-hour warehouse pickup for in-stock items.

Overnight & Weekend Delivery

Standard Overnight: Delivered on the next business day (Monday – Friday).
Friday Overnight Orders: Delivered on Monday by default.
Saturday Delivery: If you need your order delivered on Saturday, you must select a specific "Saturday Delivery" option at checkout (subject to carrier availability).

Live Shipping Rates: Our website provides live shipping rates. Simply add the item to your cart and enter your ZIP code to instantly view all available shipping options before completing your purchase.

Next-Business-Day Delivery: Next-business-day delivery is available on many items when an overnight shipping option is selected before our daily shipping cutoff. Saturday delivery must be selected separately when available.