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I also have an '89 L/C that is having heating problems. I replaced the thermostat as well and it was the same. If I stop the fan from spinning then it has absolutely no problem warming up and subsequently blowing hot air. I can only guess that water is somehow still flowing through the radiator when the thermostat is closed and causing the vehicle to not reach operating temperature. I looked up a cooling system diagram after I did the repair and it does look like there are two gaskets, but when I disassembled I never saw a second gasket or any remannats so was never concerned and just replaced the main gasket and the t-stat. The diagram shows a second gasket that goes on top of the thermostat that might possibly be critical to sealing the thermostat properly. I think I will order this part from the dealer and R&R the t-stat again. This seems like a common complaint for the L/C, can anyone else chime in and set me straight? Either way, I will report back with the results later.
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