Re: no heat in new truck
x2, did you have heat coming out the defrost? If not you could have a sticking flapper in the heater box.
Another thing, if everything else checks out, have you changed the heater core lately?
Not saying it's bad, but when I changed mine, it had an inch of old dog fur insulating it.
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'86 C-30 dually, 454/tbh400
'73 K-20 350/350/205 (sold  )
I'm kinda like duct tape- no real purpose, but handy to have around.
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