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Bleeding cooling system..Please help

benl1981

By benl1981,
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benl1981 Grand Master

benl1981

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Just finished replacing the timing belt on my R33 rb25det and I'm having trouble bleedint he cooling system. I have undone the bleed screw and I took the radiator cap off.

I then ran the car for about 5mins. It doesn't seem to stop the bubbling and the temp hasn't moved off full cold.

I pluffed the coolant temp sensor back in. Do I have to use the bleed screw or can I just leave the radiator cap off and that will work (what I have done in other cars)

Thanks

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The Dan Grand Master

The Dan

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You need to use something like a coke bottle cut in half and hold it into the radiator filler neck, then undo the bleeder nipple (not all the way, just enough to let the air out) and fill up the coke bottle. This makes the high point up front and forces the air out through the lower area (bleeder). Do this after the thermostat has opened for best results but be careful that you don't burn yourself.

benl1981 Grand Master

benl1981

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Thanks for that. A few odd things though

1. I don't know why but the temp doesn't seem to some up above a fraction over C even after idling for about 5 mins. I thought the thermostat was ok before I did the timing belt.

2. What reading does the gauge go off a temp sensor in the block somewhere? I left the one in the radiator when I flushed it with the garden hose - could this hae wrecked it?

3. The top radiator hose is nice and warm but the bottom is quite cool

What's the go you think..?

I'll do the coke bottle thing and try not taking the screw right out

I hope I haven't damaged anything - I made sure that I filled up the block by shooting coolant/water mix through the top radiator hose. Most I've run it for is abit over 5minutes

Bl4cK32 Grand Master

Bl4cK32

Posted
Posted
1. I don't know why but the temp doesn't seem to some up above a fraction over C even after idling for about 5 mins. I thought the thermostat was ok before I did the timing belt.

I find the car warms up best when starting it then driving off for a short drive.

3. The top radiator hose is nice and warm but the bottom is quite cool

What's the go you think..?

That your radiator is working as it should :D Thats the way the water flows....

Make sure you filled the overflow bottle up too, and one last thing i do is squeeze the top hose so the waters right at the top as i screw the cap on. Then i know theres no bubbles :)

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