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  1. M

    Why Did GM Route the Heater Return Hose to the Radiator on AT Equipped Trucks in the 70s-80s?

    Thanks Garageman402, you provided good insight. My toy cars are never driven in the rain so heated air for the defroster in never required. During recharge of my A/C the technition stated the air temperature is not as cold as it should be because hot water is constantly being circulated. I do...
  2. M

    Why Did GM Route the Heater Return Hose to the Radiator on AT Equipped Trucks in the 70s-80s?

    I have two cars setting next to each other. One is a totally stock 1978 Cadillac Seville and the other is a modified 1989 GMC S15 Jimmy that someone replaced the stock 4.3 V6 with a 350 ZZ4 V8 engine and the original Jimmy radiator was replaced with an aluminum radiator with the heater return...
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