Having problems with your 1998 Toyota Camry ?
Repalcing heater core - 1998 Toyota Camry
Don't replace it until you have checked it out. It might be a bad heat valve on the heater hose, the control to the valve may not be opening/closing it, there might be air in the hoses, the antifreeze level may be to low to supply the core...
Repair Help & Product Troubleshooting for 1998 Toyota Camry
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