Hey guys I am having a problem with my 1994 Sentra XE. The problem is that i keep having to replenish my rad fluid it sux's and is getting to frequent. I am not sure where this fluid is going, I do not see it leaking anywhere. I cant say for sure if it is going in the engine, though I checked my oil and it looks clean (other then it needs to be changed soon). This is not the stock rad, i replaced it with a rad I got from the dealer ship (200$ not so bad). Is this a known issue with older nissans? Is something going that I am not thinking of? I am considerding getting it pressure tested, though I do not want to spend too much money to diagnose the problem if its going to cost me 500$ to fix, the car is worth that much If i am lucky. Any ideas on what to check for?