View Full Version : how to..coolant flush??????

06-06-2010, 08:17 PM
i got my ko4 on.
coolant got flushed. now i dont have nothing.
so i put dex cool for now
monday going to audi and buying g12

and how do i flush the coolant system
any pics diy.
audidiy was gay. no pics. -_-
and how much do i buy

06-06-2010, 08:38 PM
I gallon g12 mixed with 1 gallon distilled water will suffice. You would really want to get all of that dex cool out of your system, before placing in the g12.

1. drain all coolant
2. plug system back up
3. top off with regular water from the garden hose
4. turn over engine and let it idle for a while (10-15 min) with the heat blasting on full
5. turn oiff engine and drain water mixed with left over coolant
6. refill back with garden hose water and repeate process till just water is being drained out (this is when you know your system is clean)
7. after you know your system is clean, refill with g12 mixed with "distilled" water 50/50 mix
8. bleed properly and you should be set

This is how the process is done on other vehicles, but not sure if the thermostat will cause complications due to not allowing the coolant to circulate or not. It opens when the engine oil reaches a certain temp.

06-06-2010, 08:48 PM
where do i drain out of.
lowest radiator hose???

06-06-2010, 09:02 PM
That would be the easiest place. If you take out the coolant temp sensor on the lower radiator hose, then you can drain the coolant from there (be sure not to lose the o-ring). Otherwise, there is is the actual drain plug made for draining the coolant system that is to the right of the radiator (when looking at the vehicle from the front). You will more than likely need to take off the front bumper to access it, though. The coolant temp sensor on the lower radiator hose would be your easiest bet.

06-06-2010, 09:05 PM
ok thx
i will do that tomrw

06-06-2010, 09:08 PM
any pics of this ...lower radiator hose. ect sensors
so i know how it looks like and not be mistaken

06-06-2010, 09:21 PM
Here some pics of the fan switch location (it isn't a coolant temp sensor, it is a thermal fan switch). Switch is green in these photos, which is incorrect. The switch should be blue in color. This fan switch location is used on 2000 and 2001 model years. Possibly '99.5 as well. Earlier cars have the switch screwed into the radiator side tank.

From under the car:

From above, looking straight down:

You can use the power steering pump pulley (visibile in each photo) for a reference.

06-06-2010, 10:41 PM
Pull out the driver side bumper grill, you'll see a large plastic screw that accepts a flat head screw driver, loosen. Have a wide long bucket/tray under neath the drive side of your front bumper. Most coolant will drain out.

06-07-2010, 05:44 AM
walky_talky20, thanks for the info[cool]. I was wondering why the car would have 2 coolant temp sensors.