I have a MY00 S2000 that needed a coolant change. It had the green Honda Type I coolant in it. I flushed the system four times in the proper way and I still saw the drain water running a little green, but I was tired and just stuck in the Blue Honda Type II pre mixed coolant. Could something go wrong when mixing type II with a little type I? Are they completely incompatible? Should I flush again? thanks.

 

When you flushed, did you:

1) Use clean distilled water?
2) Allowed the thermostat to open?
3) Opened both vents?

As far as mixing, a LITTLE bit won't hurt. The blue part is for seal and waterpump lubrication IIRC.

 

yes I follewd the correct procedure. The first two flushes I used tap water. The last two I used distilled water. I turned the climate **** to hot, and let the engine run for 2-3 minutes each cycle. I could only tell the water was green when I poured it back into the water jugs.

 

Somehow I don't think 2-3 minutes is enough. I usually run it for 10, with a Spoon thermostat which opens even earlier. The S takes especially long to warm up.

 

well they are both ethylene glycol solutions so I suppose some mixing won't matter? Honda recommends flushing with water, and the fact that they say only 6.9qt will drain, I know that some dilusion of type II coolant is to be expected (~1 qt water).

I don't know if the thermostat opened, but I did drain from bottom of the radiator, and the tube connecting to the oil cooler. I didn't want to remove the bolt that requires 61# torque and the coolant line was at the same height.. this should drain from both sides of the system right?

 

Which bolt? There's a bleeder nipple right next to the throttle body. The other vent is the rubber cap on the heater hose on the firewall.

 

I opened the vent cap on the hose by the firewall. I also opened the bleeder nipple when draining and filling. I filled it up until the water started to come out the bleeder. I could not get it to come out the hole by the firewall.

I was referring to the bolt on the block next to the oil cooler. the helms manual says to remove this bolt to drain coolant from the block. It requires 61# of torque though and since my wrench doesn't go that high, I decided to remove the bottom coolant hose connecting to the oil cooler. This is at the same level as the bolt so it should do the same thing.

 

The coolant drain block works. I'm guessing you don't have a torque wrench available? You could always pull the thermostat cover and pull the thermostat, that always drains the block.

After filling and letting the bleeding nipple spill, tighten it. Close the radiator, and open the heater hose's rubber cap and run the motor til water comes out.