Over Heating - Alfa Romeo Forum
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(Post Link) post #1 of 11 Old 17-08-10 Thread Starter
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Over Heating

My V6 has been overheating for the past few weeks.I first noticed when the temp guage went up past 120.I let the car cool down and had to put a lot of water to fill it back up again and went home.Since then when the car gets hot it will go past 90 up towards the next segment the fans do cut in and bring in back down but it just goes back up again till the fans cut in.
I have fitted a new thermostat today but it is still does the same thing.I presume the next thing to change would be the water pump?
I have checked I have no water in the oil sytem, so can I forget it being a head gasket.
I do not have coolant leak that I can see

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What did your gauge display before the initial overheat?

When you say it keeps climbing, are you stationary, or at speed?

Does the temperature continue to climb at high speeds and drop when idling, or is it the other way round?
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(Post Link) post #3 of 11 Old 17-08-10 Thread Starter
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I have had the car since June and the gauge never went over 90,It climbs faster at speed than stationary .I have not really pushed it past 50 mph since the over heating started and kept to short distances.It has done 77k miles and is 10 years old.What concerns me is all the while the temp goes above 100 surely the water will evaporate quickly
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If it goes up quickly when pushing on, I'd say the water pump impeller is probably cracked - it's a common problem on the V6.
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That was my thought. New water pump. When was the cam belt done? If it's due, have that done at the same time.
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(Post Link) post #6 of 11 Old 17-08-10 Thread Starter
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Cam belt done according to records on 70k.I have sourced a new pump for £80 is that reasonable
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Get the Pump fitted asp, i know it's a pricey job, especially as you would be wise to have the idlers, bottom pulley and belts done but it will cook your engine when it gives up completely!

Good luck.
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I am a time served mech engineer I can fit the pump my self but will need guidance.I fitted a water pump on my old Lancia GTi so I know the pitfalls, is the pump driven form the cam belt or a belt from the alternator etc

Last edited by AlfaV6 Alan; 17-08-10 at 22:11.
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Quote:
Originally Posted by AlfaV6 Alan View Post
I am a time served mech engineer I can fit the pump my self but will need guidance.I fitted a water pump on my old Lancia so I know the pitfalls
Put a call out to your local area chaps, you might find someone with experience who will pop along to give you a hand !
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The pump is driven from the serpentine belt on the front of the engine rather than the cambelt (good design!)

This gives a very brief guide to the belt change procedure:

How to change an Alfa Romeo V6 Cam Belt

You need to get the belt off, then the cam pullies, the belt cover backplate and then you can remove the pump - it's a big old job, and you really need a couple of hundred quids worth of tools to do the job properly - I'm about to do the whole lot on my newly bought 156 V6. I got my tools from here:

Aftermarket Tools for your Alfa Romeo TwinSpark, JTS, JTD, V6 and Twin Cam Engines

I liked them because they're just the same design as the original tools.
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(Post Link) post #11 of 11 Old 30-08-10 Thread Starter
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Finally I removed the water pump and the plastic impellor was cracked.I have now fitted the new one and will finish everything else over the next few days.This exercise has been an interesting experience, not to be attempted by the faint hearted though
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