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Paccar · Cooling System
RFN5349002
In stock · ships from Knoxville
This is a threaded coolant tank filler cap used on the coolant reservoir of many Kenworth and Peterbilt heavy-duty trucks.
Confirm the part fits before you buy. Applications and interchange numbers are researched and audited per part.
Verified fitment for 17 applications
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All confirmed applications for this part number.
Kenworth
Peterbilt
Kenworth
Peterbilt
Fitment verified via multiple parts distributors. Always double-check your OEM number before purchase.
Part data verified against 5 catalog sources
Numbers this part supersedes or interchanges with. Showing 13 of 13.
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It seals the tank to maintain system pressure, which raises the boiling point of the coolant and prevents fluid loss. Replace it when the cap no longer holds pressure — symptoms can include coolant seepage, overheating, or a coolant level that drops without visible leaks.
Part Number: RFN5349002
RADIATOR FILL CAP 572.2027
Vendor: MHC Kenworth
Dealer: KP Services Crossville
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