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On a late 80's to early 90's: Remove the hoses that lead to the heater - they are on the inside firewall in front of where the glove box is. Then, unbolt the plastic cover under the passenger side dash - this is a real pain, and you can expect a few nicks on your hands from getting them into awkward places, and a sore neck from trying to see what you're doing. Then unbolt the heater core itself - If memory serves, it is held on by a strap, I think. Anyway, the inlet and outlet lines breach the firewall, so you'll have to pull them towards the interior of the vehicle and down to get the core out. Then, install the new one. I didn't get all the bolts back in, but it really didn't matter. Then you reconnect the lines, turn on the engine and the heat, and top up the fluid level once the engine temperature gets hot enough to open the thermostat.
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