this may sound terrible but i can't find the radiator cap on my car. it is a '93 90s with the 2.8L V6. I have tried putting in coolant through the overflow tank but it seems to never go down any. the radiator fans come on and there seems to be some colant in the system, I hope. I have checked all over the radiator but can find nothing. does this car not have a preasure cap? any help would be great. thanks!