Tonka Man Posted October 13 Posted October 13 Excuse my ignorance, but what is that silver thing behind the rear seat of my car? It looks like maybe duct work for a rear defrost. Is that what it is? The top has a cap that looks pinched on a couple of sides like it could be removed for something. Quote
1970mcss Posted October 13 Posted October 13 The rear defroster is an option but silver tube is a breather for the fuel system, 2 Quote
Canuck Posted October 13 Posted October 13 There was a rear defogger that was an option. It was a fan that blew air at the rear window. Don’t expect it to defrost anything as it is just cold air. That canister is part of the fuel system. I believe it collects fuel vapours. 5 Quote
Tonka Man Posted October 13 Author Posted October 13 Did all of these cars have that canister? I've had the back seat out of my '70 a dozen times and I don't remember it. Quote
mon-tss Posted October 13 Posted October 13 Only California cars in 70, all in 71 and 72. Don't know if all in 70 or started sometime during the year. Quote
Tonka Man Posted October 13 Author Posted October 13 I checked my body codes and my two Astro Blue 1970 Monte's are from the Flint plant. The Cottonwood Green one is from the California plant. Quote
1970mcss Posted October 13 Posted October 13 My 70 doesn't have it. My car is a Baltimore built car. 1 Quote
Scott S. Posted October 13 Posted October 13 3 hours ago, Dtret said: My 70 SS Flint car does not have it. Neither does mine..... But I think Canadian '70's did. Different emission laws at various plants. Quote
Scott S. Posted October 13 Posted October 13 13 hours ago, Tonka Man said: Excuse my ignorance, but what is that silver thing behind the rear seat of my car? It looks like maybe duct work for a rear defrost. Is that what it is? The top has a cap that looks pinched on a couple of sides like it could be removed for something. The rear defrost was a vent and fan assembly in the trunk that fed to what looks like a floor vent on the package tray. 2 Quote
Dtret Posted October 13 Posted October 13 1 hour ago, Scott S. said: Neither does mine..... But I think Canadian '70's did. Different emission laws at various plants. All plants had to comply with fed standards. No exceptions. The gm rule was that ALL build sheets should be destroyed but the Flint plant was the only one that fully complied as best as we can tell. Quote
Dtret Posted October 13 Posted October 13 Gm actually called it a defogger because they knew it wouldn’t defrost. lol. 2 1 Quote
Dtret Posted October 13 Posted October 13 5 minutes ago, 70white402 said: My sept 69 car doesn’t have the vent. Does it have the grill on the interior side of the package tray? You have to read the response really well it’s not clear but once reading closely it is correct. I almost responded as you did. Quote
Grant MacPherson Posted October 13 Posted October 13 My 70 does not, built in California, sold in Arizona. It doesn't appear to have been removed.. Does anyone know if dealer location made a difference? Quote
Dtret Posted October 13 Posted October 13 It was an option to be ordered. Anyone could order it. But not as prevalent in the warmer states. 1 Quote
Canuck Posted October 14 Posted October 14 4 hours ago, Grant MacPherson said: My 70 does not, built in California, sold in Arizona. It doesn't appear to have been removed.. Does anyone know if dealer location made a difference? The fuel vapour canister system for 1970 would only be for cars sold from California dealers. 4 1 Quote
Tonka Man Posted October 14 Author Posted October 14 Thanks for all the info from everyone. Really interesting facts when you get down in the weeds on these cars! I replaced the gas tank on this car and it had all those extra lines going to that separator ASM unit. Quote
Scott S. Posted October 14 Posted October 14 22 hours ago, Dtret said: All plants had to comply with fed standards. No exceptions. The gm rule was that ALL build sheets should be destroyed but the Flint plant was the only one that fully complied as best as we can tell. So that's why Flint cars don't have build sheets.... Quote
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