1998 Plymouth Voyager "chev 3500 pcm" Questions

...chev impala. (V6) (Just purchased) When i start the engine with the remote the engine temp will come up to normal without supplying any heat to the cab. Until I get in and raise the rpm to about 1500 ...

...chev. 1500? 1500HD , 2500 or 3500???????? al in HD format too. no car told but lets do 1500 only 5.3., VIN Z automatic box. as a rule low codes are first. 140 is HO2S Circuit Insufficient Activity ...