[stsalvage]

Looks like your heater part looks good No problems so far There is a shut off valve for the AC units ant i will picture on my 1971 Cheyenne 1/2 ton.

My grand father told me AC is for wimps.

But the heater must work if you plan on driving it off this property.

He was a man about maintenance.He told me Heaters are used for when your cold.But there used to keep your engine cool.He said the heater is the once peace you don't let it quit working you fix it

He said if your out an about and 40 miles away from home.An your truck starts to over heat turn on the heater 30 sec's is a life time for water to travel from your 270 degree's engine to your heater cools it back down to 190.

So he said You fry or the truck frys when you stop an it 100 degrees out you still fry.

Turn on the heater turn it to defroster open up your Vent wings and watch your temp gauge.All ways be a gauge water every 5-10 miles or ever 5-10 mins scan your gauges.

Did that in a 1965 3/4 ton with a trailer hauling scrap metal for 15 years.Never blew a head gasket Did get my truck Hot but always made it home.

Make sure your truck works all gauges test them ever so often.