Dayco 87840 HVAC Heater Hose - Heater To Engine or Heater To Pipe

Dayco 87840 Small I.D. Heater Hose

Dayco 87840 is a Small I.D. Heater Hose built for HVAC heater circuit service on select Jeep Wrangler applications. This dual I.D. heater hose uses EPDM construction and black finish to match common underhood routing needs while maintaining the correct hose sizes for the heater-to-engine and heater-to-pipe connections.

Key Features

• EPDM heater hose construction for HVAC coolant routing
• Dual I.D. hose with 5/8 in. end 1 inside diameter and 3/4 in. end 2 inside diameter
• Black finish for a clean underhood appearance
• Meets SAE J20R3 Class D-1 and SAE J1684 Type EC specifications
• Dayco 87840 small I.D. heater hose for select Jeep Wrangler heater connections

Product Details

The Dayco Small I.D. Heater Hose line is built for applications that require precise hose sizing in heater and coolant transfer paths. Part number 87840 is a dual I.D. hose with different inside diameters at each end, making it suitable for routing between components that use 5/8-inch and 3/4-inch connections. For 1991-1995 Jeep Wrangler models, this hose is listed for heater to engine and heater to pipe positions. Dayco 87840 is also cross-referenced to ACDelco 18022L for the same application.

Common Uses

• Replacing a cracked or hardened heater hose on a Jeep Wrangler
• Restoring coolant flow between the heater circuit and engine
• Addressing leaks at heater hose connection points
• Correcting hose fitment where dual inside diameters are required
• Servicing HVAC heater hose routing on 1991-1995 Jeep Wrangler models

Installation Notes

Verify the existing hose routing and end diameters before installation. This hose is specified for heater to engine and heater to pipe locations on 1991-1995 Jeep Wrangler applications. Confirm clamp condition, inspect mating tubes for corrosion or damage, and replace any worn clamps during service if needed.

Quality Assurance

Dayco manufactures this heater hose to SAE J20R3 Class D-1 and SAE J1684 Type EC specifications, supporting consistent material and performance requirements for HVAC hose service.