Top hose of the heater core goes to the thermostat housing. The lower hose goes the the fitting behind the A/C compressor.
they run from two points by the fan in the front by the water pump to the heater core routed along the passenger side wheelwell until they reach the heater core either hose can go on either location because a heater core exchanges heat the same no matter which direction the flow passes in it. I hooked up mine so that the hoses stayed parallel to each.
heater core is probably faulty if fan only blows cold, also check air temperature controls, vent may be stuck The heater core is basically another radiator in your vehicle that tranfers warm fluid from your engine/radiator to the inside of your vehicle. This usually means that it depends on continuous flow to work. The fluid supply line to the core could be blocked or routed incorrectly, or the core could be bad. Its possible that a previous owner had a leaking heater core and bypassed the heater core entirely (happened to me) and never told the purchaser.
it depends on the engine. on a 2.8l, the serpentine belt tensioner is below the power steering pump. pay careful attention to how the belt is routed, especially if there is no belt routing diagram under the hood (should be on the belt guard on top of the engine). release the tension from the tensioner, replace the belt, make sure you have it routed correctly, release the tensioner.
The coolant elbows are plastic elbows (one top, one bottom) that go from the tensioner assembly to the engine block. GM routed the heater core lines through the tensioner assembly (crazy design!). I found the Dorman aftermarket parts at Advance Auto Parts for about $6 for both, GM are more expensive.
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