Keep coolant flowing between the radiator and engine with the Gates Molded Radiator Coolant Hose 21143, a lower-position hose pre-formed to route through the factory path on a wide range of 1977-1990 GM cars. It drops in as a direct-fit replacement for applications such as the 1977-1985 Buick LeSabre [V8-5.7L], 1980-1985 Chevrolet Caprice [V8-5.7L], 1977-1984 Oldsmobile 98 [V8-5.7L], and 1977-1984 Pontiac Bonneville [V8-5.7L] — see the Buyer's Guide tab for the full 66-application list.
- EPDM construction: EPDM tube with synthetic fiber knit reinforcement and a heat-, ozone- and chemical coolant-resistant EPDM cover.
- Collapse resistance: specifically-engineered materials resist collapse under vacuum.
- Degradation resistance: engineered to resist electrochemical degradation, the leading cause of hose failure.
- Standards & range: meets the requirements of SAE 20R4, class D2 and DIN 73411, class A (except for tolerances); rated for -40°F to +257°F (-40°C to +125°C).
Molded to shape for a good fit and properly sealed connections, this lower hose replaces a cracked, swollen, or leaking original. Gates recommends installing new hose clamps whenever a new coolant hose is fitted. Do not use for fuel or oil transfer applications. Country of origin: United States. Manufacturer part number 21143.
Frequently Asked Questions
Is this an upper or lower radiator hose?
This is a lower-position molded coolant hose. It is pre-shaped to route through the factory lower path on the listed applications.
What is the hose made of?
It uses an EPDM tube, synthetic fiber knit reinforcement, and a heat-, ozone- and chemical coolant-resistant EPDM cover, and is engineered to resist electrochemical degradation.
What temperature range and standards does it meet?
It is rated from -40°F to +257°F (-40°C to +125°C) and meets the requirements of SAE 20R4, class D2 and DIN 73411, class A (except for tolerances).
Should I replace the hose clamps too?
Gates recommends installing new hose clamps each time a new coolant hose is fitted.
Which vehicles does it fit?
It fits many 1977-1990 GM cars with V8-4.3L, V8-5.0L, V8-5.7L, and V8-6.6L engines, such as the Buick LeSabre and Chevrolet Caprice — see the Buyer's Guide tab for the full list.
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