Many simple maintenance items can be overlooked because the more pressing issues that abound with our Corvettes camouflage them. That is, until they leave us sitting along the highway. Then they become the pressing issues of the day. One item that can put you in this situation is the oil cooler that was hailed as RPO KC4. This engine oil cooler was installed on 84-91 Corvettes. It was discontinued in the 92 model year because it was deemed unnecessary with the use of synthetic oil in the LT1 engine. The oil cooler does a fine job of keeping the oil temperature lower by cooling it with engine coolant. Simple preventive maintenance can keep your oil cooler so reliable that you can almost forget its there. Follow along and well show you how to give it the TLC it deserves.
The only thing left to do is to fill the cooling system. You may find that once the thermostat opens and the coolant level drops, the Low Coolant dash light will come on. A little trick to keep this light from popping up is to run the car with the radiator cap off. Once the car gets up to operating temperature, the thermostat opens and coolant starts to flow. When you see that happen, have a friend run the engine speed up to about 1,500 rpm. The fluid level will drop in the radiator and you can add more coolant to top it off. Make sure you put the radiator cap on before your friend takes his/her foot off the accelerator, or all the water you just put in the radiator will come back out a lot hotter than when it went in.