I tried to get heat today and it just has a fiant bit of heat. All the
vents blow where they should.but the temp control in the center of the
dash doesn't seem to to be letting the hot water in. Their isn't any
control valve in the heater line under the hood. The hoses go from the
block straight to the core. Does anyone know what regulates the water
flow. It was working good the last time I used it. The rad is full.
You have an system called blend air there are no valves just air doors that
direct air through
ac evap. or heater core. If these doors are not programmed properly
heating or cooling will be compromised.
I had the same problem on my 2000 GMC Sierra (v8) and what i did was removed
the two hoses that go to the firewall down to the heater core, and placed my
garden hose (cut it and clamped it) to the left outlet on the heater core
(reverse flush) and clamped about 6 foot of hose to the right inlet, just so
that all the water drained away from the motor.....then i cranked the water
hose, and flushed out the core! at first the flow of the water was weak,
but after a minute or so it flowed strong! unblocking the restriction. let
that flow for about ten minutes, then switched the hoses and flushed it in
the normal flow direction! now my heat is HOT! just pop the hood after
your at normal operating temperture and feel the hose that runs to the inlet
(right side - firewall) should be hot, as well as the left side (Outlet) if
the left side hose is cool, you may have some heater core blockage!
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