I got a '93 3.5 L ES, never flushed the coolant system since I've bought it in '98. My ignorance has caused me to just check the level and fill it from time to time. The engine has never had any over-heating issues. Always runs normal temp.
I have a Haynes manual and the procedure seems pretty basic. Any suggestions and tips? It says there are 2 drain plugs on the engine block. There is no radiator cap, so I assume you fill it in the coolant overfill tank.
The next oil change I was planning on draining, flushing, and re-filling with a 50 / 50 mixture of distilled water and coolant.
Currently it is 100% coolant, no water. I've been told 50/50 it the best option.
Last edited by mf2004champ; 03-16-2007 at 03:33 PM..
Completed the drain, flush, and re-fill. Everything went according to plan. The draincock was difficult to get loose, needed plyers, very carefully not to destroy it!
Got most of the coolant out. Surprisingly very clean. Even while flushing, very clean system. Re-filled with 50% NAPA coolant and 50 % distilled water.
The bleed valve was put to use. Wow, now I understand why these engines have it. A ton of air was coming out, until a steady stream started through the tubing. Drove it for a little, next day had to top off the coolant overflow tank to the 'cold fill line.'
I wish I did this at the beginning of winter, b/c my heater can really crank now. There is a noticable difference in the temp. of the air. It probably could be b/c it is now 50% water, not 100% coolant.