i have a 98 plymouth voyager and I did some work on the a/c system a while back. i would like to inject the die from the local auto parts store to see if there are any leaks before i take it in for a charge . the system has been charged once by someone else. is there any special precautions with using the die and how do i do it. also, how long does it take to see if there is a leak. thanks

I use a certain kind of engine flush on my 88 caddy sedan deville. The flush said to add to oil, let run for 5-10 minutes, and then drain oil and change filter, which I did. I then notice some creamy peanut butter colored-like goo inside the crankcase and on the oil cap, which I figured the flush treatment had probably lifted some dirt and other stuff up but did not actually flush it out. I added new oil and filter but now when I checked my oil the other day, my dip stick came out that same creamy peanut butter color. I was thinking that I may need to have my engine flushed at a professional GM repair shop along with a oil change. My car runs sluggish and even cuts off after running awhile, there is white smoke coming from the tailpipes and when trying to restart my car it sometimes won't start; I have to let it sit awile before trying again. I recently replaced the alternator, battery, thermostat, had radiator rodded out and as I said did the engine flush and changed oil and filter(which no doubt will have to be done again). If any one have an ideal of what's happening please give advise. :confused: