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4x4Poet · 10-02-2005, 03:29 AM

Nope. I just went out in the dark with a flashlight to look. I did make a mistake in my post. The heater hoses come at it from ~1 ft to the pass side of the heater and hook to the side of the heater unit. The heater could be aftermarket (meaning not a factory option), but I also checked my K10 burb just now and, although it has no rear heater, it does have two ~1.5" holes in the rear metal floor at the same place as the holes thru which my K20 burb's rear heater hoses enter the "cab" on their way to the rear heater.

Perfect floor hole size for a grommet with an opening for 5/8" inch hose. I didn't look close enough to see if one hose is 3/4 and it's been years since I replaced the corroding metal "Ys" with plastic ones from NAPA, so I don't have the hose sizes down. Obviously, one must be 5/8"

Certainly, my K20 burb could have a rear heater from another burb, but why would the factory put those hose-sized holes in both my K20 and K10 burbs' floors under the 2nd seat if not for heater hoses? I still need to check the mounting bolt/nut arrangement. Rained today– and now.

10-02-2005, 03:29 AM	#6
4x4Poet Registered User Join Date: Nov 2004 Location: "Under Montana skies." Posts: 1,836	Nope. I just went out in the dark with a flashlight to look. I did make a mistake in my post. The heater hoses come at it from ~1 ft to the pass side of the heater and hook to the side of the heater unit. The heater could be aftermarket (meaning not a factory option), but I also checked my K10 burb just now and, although it has no rear heater, it does have two ~1.5" holes in the rear metal floor at the same place as the holes thru which my K20 burb's rear heater hoses enter the "cab" on their way to the rear heater. Perfect floor hole size for a grommet with an opening for 5/8" inch hose. I didn't look close enough to see if one hose is 3/4 and it's been years since I replaced the corroding metal "Ys" with plastic ones from NAPA, so I don't have the hose sizes down. Obviously, one must be 5/8" Certainly, my K20 burb could have a rear heater from another burb, but why would the factory put those hose-sized holes in both my K20 and K10 burbs' floors under the 2nd seat if not for heater hoses? I still need to check the mounting bolt/nut arrangement. Rained today– and now. __________________ '71 GMC K20 Suburban, '71 GMC K10 Suburban, '72 Chevy C10 CST Suburban, '72 Chevy K20 clunker pickup.