Good luck to you!
How do you change the heater core in a '90 Toyota Camry DX?
Disconnect battery ground cable, then discharge system refrigerant.
Disconnect refrigerant lines from cooling unit Fig. 10, capping all openings.
Remove grommets from inlet and outlet fittings.
Drain cooling system.
Disconnect heater hoses at fire wall.
Remove glove compartment and lower instrument panel cover.
Disconnect electrical connectors at pressure switch and A/C harness.
Remove heating unit and cooling unit retaining bolts and nuts.
Remove heating and cooling units as an assembly.
Remove large sectional clamp retaining heating unit to cooling unit.
Separate upper and lower heater unit case.
Remove heater core.
Reverse removal procedures to install.
Evacuate and recharge A/C system, check for leaks.
Refill cooling system with new
How do you change the heater core in a '90 Toyota Camry DX?
this one is a pretty easy one to do. it is located on the drivers side kick panel. once you expose it you will have to losen the clamps on the engine side and remove the hoses. then take the bracket off inside pull it out and replace it. watch the antifreeze inside, other then that good luck.
I've never removed one from a Toyota, but usually there is a heater box below the dash on the passenger side, where the heater core is located. You would first disconnect the inlet and outlet hoses on the opposite side of the firewall (under the hood) before you get started. On some cars you have to remove the whole heater box. You should get a $20 service manual for your car so you don't break other components upon removal.
The heater box has rods to the vent switches and usually a plug that's hooked up to the blower motor that's in the heater box.
It is not a difficult opperation, but you have to be very gentle with the new heater core upon installation, because a slight bump to either inlet or outlet port could cause another leak to the new core, and you'll notice it after it's all assembled and filled with fluid!
