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also-I realize this is av8--but the same thing still applies---wish I could find an edit button on hereReport it
If i do not miss my guess afte many years of experience with chevy v6 and transmission set-ups..i would bet your heater and tranny woes are tied together...their is likely a common vacuum supplky for both..look for a point where they branch off..one back to the firewall to the heater controls and one to the transmission,likely a leak or broken connection is someone about and could be anywhere along the vacuum supply route.Look closely anywhere the line touches metal and especially at the junction place.That would cause both systems to screw up..by the way the hard shift , if due to vacuum loss, will not harm the tranny ,in fact is easier on it then the smooth shift we all prefer as the smoothness is due to built in slippage which is where wear happens.But past a certain point none of us want a hard shift,and that vacuum source could well be the problem and needs fixed.Anytimne you have a harder shift appear AND hvac mess-up at same time on a chevy,,suspect that vacuum junction and /or the vacuum supply at some point along it's route.Report it
forgive my typos .. my courser is jumping everywhere today.Report it
FYI - Chevy just had a recall on the power steering pump return line.Report it
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