koyo radiator owners please read

[98240]

I am going to put my koyo radiator in today. I was wodering if you guys went by the fsm when you put the fluid in or if you just opened the air relief plug near the throttle body? my freind says to just open the air relief plug. The fsm says to disconnect heater hose, to take the bolt out of the block,and open air relief plug. What did you guys do

[fiznat]

I just used the relief plug when I did it, although I also had one of those "spill free" funnels which really help in limiting the amount of air that gets into the system.

Bleeding the coolant is one of the most PIA jobs there is imo. One time it'll work perfectly, and the next time you'll do it the exact same way and it'll take 3 hours to get all the air out.

I would try it with just the throttle body vent thing first, and also look into getting one of those funnels as well. Good luck!

[PapaSmurf2k3]

Its true, those funnels rock my socks.

I've bled my coolant system probably about 5 times, and most times, when you just use the bleeder screw you'll be fine. The last time I did it, the temp started to climb a little bit (on my inag. KA-T to exhaust shop run). As soon as it was slightly above normal, I juked the car left and right, and slammed the brakes a couple times, and that cleared the problem up. Functional method, or coincodence, I don't know, but it got me to the exhaust shop.

[TheOne]

spill free funnel FTW!!

those things have saved time(too bad i currently don't have 1, used to but my brother took it)

try flushing the whole system first if its a stock motor, open the bleeder screw till water comes out, close, add water as necessary and massage the top hose to try to get the air that gets stuck in it.

[Brandon93240]

I work in a body shop and constantly have front subframes and engine/transmission assemblies out. I always hook up all the hoses except one heater hose. Then I fill the radiator until coolant pours out the hose. Hook the heater hose back up, then start the car, let it run until the thermostat opens, add some coolant. Squeeze the upper hose to help relieve air pockets, and thats about it. Its always important to know the capacity of the system also, and about how much is already in the system. If its a 2 gallon system. and you've only put in one gallon and you think its full b/c you have an air pocket your going to have a recheck. Usually I deduct about 1/3 to 1/2 gallon from the capacity, and you should have to add about what is left. Been doing it the same since I've been a mechanic, and never had a problem. If you own a BMW sometimes you have to race the engine to pull coolant in if it has a auxilary surge tank.

[98240]

I put the radiator in and I was having problems bleeding it. The temp needle went up to about 75%. The I remembered to turn on the heater and the temps went down since it sucked coolant from the reserve tank. I filled the reserve tank 3 times. Then I opened the bleeder screw and nothing was happening. One of the guys seen me working on the car and said since I have a overflow or reserve tank I dont need to bleed it. He said thats what the tank is for. So I took the car for a spin and the temp needle stayed at roughly 50%. I drove it home about 15 min from my house and the temp didnt rise at all. So I guess its good. Do you guys use nismo thermastats? What is the difference between a stock thermostat and a nismo thermostat? Do you recommend the Nismo?

Thanks

[eazye2000]

I wouldn't recommend the Nismo personally.. The stock thermostat is already at 170 degrees. Which is like 20 degrees cooler than most other cars. You don't want your car to run too cool, especially for a daily driver. You wont get good gas mileage.

And again, my $.02

[Florida240sx]

I've never used the bleeder... just squeeze the hose car parked at an angle, and fill it up and start car with cap open while squeezing hose etc..... done about 6 240's and no problems....

[98240]

Thanks for all the help, everything is good to go. I havent had any overheating problems so I guess the air is out of the system.

[chandler]

I just got a new tool called an air lift that runs a vacuum on the cooling system, open the valve that sits in a jug of coolant and no air pockets, its straight up pimp, got it ogg of the cornwell truck for 107$

[xTearsFallForeverx]

I've always used the bleeder on the intake.. Never had any problems. Just make sure you open it before you put he water/af in so all the air escapes from there. After that I usually close it and run my heater for about 5 minutes then I carefully open it again to let any remaining pressure out. Don't do it fast because hot anitfreeze will shoot out like crazy.