Radiator Cap Replacement numbers

[Paul and Sue]

What would some of the radiator cap replacement numbers be for a 2004 W-22 at an auto parts store and/or Workhorse?

[DriVer]

The Workhorse part number is: RC-33. See if you can find a Delco supplier in your neighborhood. They should be able to cross reference that or you could go to a Workhorse dealer and get one from them if they have one in stock.

Most NAPAs, Advance, Carquest and Autozone stores can't cross reference the RC-33 number even though it's a Delco Part number. The specification for the cap is that it should be a 15psi cap.

[Cacti]

I thought I read on a post a while ago that the RC-33 15 psi is the cap but the GM part# is 10409635 which can be purchased at a Chevy dealer for $15.58. I wrote this on my parts list.

[EngineerMike]

You should be able to match the cap if you take it in. Important to know whether it is vented (overflow tank system) or non-vented (no overflow). Usually if vented, Vented is stamped on the cap. This is a good item to carry as a spare when your rig has a few miles and years on it, as the spring wears out & won't hold the full pressure, allowing engine temp to creep up.

[Rocky Larson]

Oemys Web Site - Workhorse Parts Cross Reference