2000 Cadillac is overheating occasionally. Any suggestions on what to check?

Cotton Top

New member
I have checked that little 3/8" line to the holding tank and it pours thru it fine. I have added regular antifreeze to the system before I knew that these vehicles use Dexcool. However I just purchased this car and do not know if the previous owners have replaced the system with regular antifreeze or not. Car seems to heat up maybe once within a 30 to 50 mile trip and right before it does the heater starts blowing cold air. However I only have to let the car sit shutoff maybe for a couple of minutes and then it's ready to go again. Any suggestions would help, thanks.
 
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