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Old 22-10-2008   #1
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Advice on bleeding radiator please!

Hi all,
I have recently been having problems with my 1999 fiat Bravo 1.6 HLX's temperature guage rising when in city traffic. I turn the engine off and immediately back on and the guage has reset itself to half way.

I have been advised to bleed the cooling system as I may have an airlock. I have managed to bleed the hose (under exhaust manifold) but can't seem to get water coming out of the radiator bleed screw. I have been told to fill the radiator until water comes out of the bleed screw but am unsure as to where to fill the radiator. Do I just keep filling the expansion tank or do I remove the top hose?

Any advice (or other guesses as to what it could be - thermostat, temp sensor etc) would be greatly appreciated.

Cheers,
Griff
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Old 22-10-2008   #2
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Re: Advice on bleeding radiator please!

In the past, I've struggled to get water from the radiator bleed screw but had no trouble with the bleed screws on the hoses. In my case it took a lot of 'hose squeezing' to get it to flow....
Are you sure you don't just have the typical Bravo/Brava dodgy temperature gauge connection behind the dash? In my case a thump on the dashboard top brings it back under control....
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Old 22-10-2008   #3
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Re: Advice on bleeding radiator please!

Quote Originally Posted by littleonyxguppy View Post
I turn the engine off and immediately back on and the guage has reset itself to half way.
that means your gauge is telling fibs, because it cant cool that quickly.

next time it happens bang your fist above the gauge, it should drop back down. its a common problem.
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Old 22-10-2008   #4
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Re: Advice on bleeding radiator please!

Cheers for that. I've tried thumping the dash as I've heard of this problem. Didn't do anything though! The temperature rises only when I'm doing under 30 or stopped. Although I thought the car may be overheating, it seemed a bit weird that I could turn the engine off and immediately back on, without giving it time to cool down, that the temperature guage would revert back to halfway.

After bleeding the hose it now does it less frequently which suggests I do have trapped air in there.

When you say "hose squeezing" did you just squeeze all the hoses you could see? Also, when I got a flow out of the hose bleed screw the liquid was initially pretty dirty. I let it bleed until it ran clear. What could this mean?
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Old 22-10-2008   #5
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Re: Advice on bleeding radiator please!

Cheers Jug... I'm off into the delights of Bath traffic now so it will inevitably happen again. I'll keep thumping but it hasn't seemed to work so far!!!
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Old 22-10-2008   #6
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Re: Advice on bleeding radiator please!

if thumping doesnt work then try disconnecting then reconnecting the wiring connectors behind the intrument cluster.

if that doest work try disconnecting the coolant tmep senosr (on the thermostat housing) and check its connector is rust and dirt free.

Quote Originally Posted by littleonyxguppy View Post
Also, when I got a flow out of the hose bleed screw the liquid was initially pretty dirty. I let it bleed until it ran clear. What could this mean?
its a strange one, the coolant gets mixed so regularly that it should all be the same.
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Old 22-10-2008   #7
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Re: Advice on bleeding radiator please!

With regard to squeezing the hoses - both the hoses running to the radiator worked for me. I think my airlock was in the radiator, not any of the heater hoses. Mine also ran fairly grotty coloured water at first, could be the sediment gets disturbed. I ended up emptying the system and running through a lot of water to flush, before putting in new anti-freeze. It looked like the coolant had never been changed before....
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Old 22-10-2008   #8
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Re: Advice on bleeding radiator please!

Quote Originally Posted by The Professor View Post
Mine also ran fairly grotty coloured water at first, could be the sediment gets disturbed.
I thought that may be the case. Thanks for putting my mind at rest!

I tried squeezing the hoses but still nothing out of the radiator bleed. (I only had 5 minutes before the school run so may need to do it longer!) Just to clarify should I have the engine running with the heater on to do this?

I wanted to flush the radiator as I think this is where the problem lies but can't get to the hoses to disconect them. The air inlet shroud won't come off. 1 screw comes out easily but the other 2 seem to be turning freely in the sockets. Any advice on this one before I snap the damn thing in two??!!!
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Old 22-10-2008   #9
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Re: Advice on bleeding radiator please!

Quote Originally Posted by littleonyxguppy View Post
Just to clarify should I have the engine running with the heater on to do this?
yes, otherwise it wont work.

Quote Originally Posted by littleonyxguppy View Post
the other 2 seem to be turning freely in the sockets. Any advice on this one before I snap the damn thing in two??!!!
destroy it then kill it with fire
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Old 22-10-2008   #10
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Re: Advice on bleeding radiator please!

Very tempting jug!
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