Kwik Performance Inc. | SKU: K10709

AC Hose Kit (88-90) OBS Chevy - GM R4 - K10709

Name: AC Hose Kit (88-90) OBS Chevy - GM R4 - K10709
Brand: Kwik Performance Inc.
SKU: K10709
Price: 295.0 USD
Availability: InStock

$295.00 USD

Shipping calculated at checkout.

Description

Upgrade your LS-swapped 1988–1990 OBS Chevy truck with a bolt-on AC hose kit engineered specifically to connect a GM R4 compressor to the factory R12 AC system. This hose kit makes it easy to bring cold air back into your classic truck without the hassle of sourcing fittings or custom crimping.

Precision Fit for 1988–1990 OBS Chevy Trucks

This kit is tailored for trucks originally equipped with R12 AC systems and a condenser that uses one male and one female connection. If your 1990 truck has two male fittings, refer to our AC Hose Kit (90–93) OBS Chevy – GM R4 – K10671.

Designed for GM R4 Compressors on LS Swaps

This kit is designed for use with the Kwik Performance AC bracket (K10623) and vertical manifold fitting kit (Kwik part number 045024). It allows you to integrate a GM R4 compressor into your LS-powered setup while maintaining compatibility with your truck's OEM AC system.

High-Quality Components & Factory-Style Routing

All hoses are pre-crimped for easy installation. Features include a durable bent hard line that routes cleanly from the condenser through the engine bay to reduce rubbing. Our hose kit also includes service ports on both suction and discharge lines, and a multi-function pressure switch. This setup mimics factory routing, improving reliability and aesthetics.

LS R4 compressor bracket:

K10623 Truck/LS3 Camaro spacing

Chevy OBS condenser guide

What's Included / Other Requirements

Hose kit includes:

#10 suction hose (1/2” ID, 1” OD)

-45 degree swivel from receiver/drier

-90 degree swivel with service port to compressor

#8 high pressure hose (13/32” ID, 29/32”OD)

-135 degree swivel with service port from compressor

-Straight swivel connects to safety switch fitting

-Safety switch fitting

-Safety switch (can be wired as binary or trinary)

-40 amp fan relay

-Bent ½” hard line with #8 male and female swivels connects to condenser

-Vertical AC manifold, Kwik part number 045024

Other requirements:

GM R4 compressor with 6-groove serpentine pulley

Installation Instructions

88-90 OBS R4 AC lines Instructions

FAQs

Q: What compressor works with this AC Hose Kit?

A: This AC Hose Kits works with the GM R4 compressor, if you have a Sanden Mini refer to our K10707, if you have the Sanden HD check out our K10708.

Q: Will this kit work with other AC brackets or compressors?
A: This kit is specifically designed to work with the Kwik Performance AC bracket (K10623) and a GM R4 compressor. Compatibility with other setups is not guaranteed. If you have questions, do not hesitate to give us a call at 417-955-1467.

Q: What if my truck has two male fittings at the condenser?
A: You'll need our AC Hose Kit (90–93) OBS Chevy – GM R4 – K10671, which is made specifically for that fitting configuration.

Q: Can I wire this kit as a binary or trinary system?
A: Yes. The included pressure switch supports both configurations and we provide wiring diagrams for each.

Q: Why do I need to wait to open the drier?
A: The drier contains desiccant that absorbs moisture. Opening it too early can reduce effectiveness. Only open it when you’re ready to pull a vacuum.

Q: Is any custom crimping or hose cutting required?
A: No. All hoses are pre-cut and pre-crimped to make installation as fast and easy as possible.

Q: What type of oil is included and what's it for?
A: A small tube of PAG oil is included to lubricate O-rings during installation. It is not for filling the compressor.

Q: Will this kit fit a small block or big block engine?
A: This specific kit is designed for LS engine swaps. We offer other kits compatible with small block or big block setups.

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