Find the two hoses that go to the heater core, usually 3/4 in. hoses, and connect them. It's very simple.
Take both heater hoses off at the heater and the hose running from the front, attach it to the rear of the engine.
Under the driver side dash you should see a small removable panel..
Behind the dashboard, usually on the passenger side. Look in the engine compartment for the hoses that go from the engine through the firewall. Those are generally the heater hoses, which go to the heater core.
join the inlet and outlet hoses together.
Follow the heater hoses to the firewall. There should be 2. disconect them from the heater core, then insert a 5/8 hose bib and clamp them together.
Drain the water from your 1994 Chevrolet Blazer cooling system. Remove the heater core water supply hoses. Remove the heater core retaining bolts. Reverse the process to install the new heater core.
The dash must be completely removed in order to gain access to the heater box. Then the heater hoses are disconnected and the heater box is removed and opened up. That gains access to the heater core for relacement.
The dash must be completely removed in order to gain access to the heater box. Then the heater hoses are disconnected and the heater box is removed and opened up. That gains access to the heater core for relacement.
On the firewall, under the hood, you will find the inlet and outlet hoses.
take the 2 hoses off to the heater core and get a hose and flush out the core through both hose fittings on the firewall.
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