Where is the diagnostics port on a 1986 Chevrolet P30 in particular Winnebago Chieftain?

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I believe it is inside, under the drivers side of the dash, on the firewall, close to the fuse box.
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What freon for Chevrolet p30?

It depends on the year but in most cases from 1993 and up they will use R134a freon but you can always check the VIN number with the dealer and remember that R134a freon will

Where is the fuse box on a 1983 Chevrolet p30 step van?

Hola, mi nonbre es Jorge desde Puerto rico. Estoy restaurando una guagua GMC grumman P-30 del 1983. yo necesito la caja de fusibles, debajo del dash. si alguien sabe como la p