jmbillings
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 posted on 24/4/02 at 09:50 AM |
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Run-on coolant pump??
Our rad fan runs for ages after stopping, and the cause is obvious: although the fan is spinning, all it is cooling is the water in the rad- the stuff
in the engine is bubbling away merrily.
What we need is some sort of electric water pump that can circulate the water after we have switched off so the fan actually does something... I have
seen the likes of Demon Tweeks selling posh computer controlled water pumps that look like turbo's (and cost as much) but thats a bit too pricey!
Just want something small and simple that can be wired inline with the fan switch so it runs until everything is cooled down...
Any ideas?
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andya
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| posted on 25/4/02 at 07:47 PM |
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Renault use small electric pumps in R19-16v and R5 GT Turbos to do just that, relay controlled and run on after engine stopped.
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stephen_gusterson
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| posted on 4/5/02 at 09:19 PM |
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As 99.9% of road cars dont have such a run on pump, why do you think you need one?
The reason your fan runs on is that you should have connected it so it turns off when you take out the ignition key.
Also, as most fans only really come on in hot weather, or in slow or standing traffic, I wonder if your problem is actually an undersized rad or
insufficent air flow, causing the ran to actually be on when you switch off anyway.
atb
Steve
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jmbillings
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| posted on 4/5/02 at 09:28 PM |
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Nah- the fan comes on a minute or two *after* stopping the engine. The temp never gets too hot during driving, and the fan cuts in and out ok if in
traffic for a while... its just the way that it comes on after stopping suggests the water is heating up after the engine stops (due to the heat of
the block) but isn't being cooled as when the fan comes on it only cools what is in the rad. My dads old renault used to have the fan run on after
stopping, presumably same reason. Maybe its not to be worried about, but I would have thought water boiling up every time the engine is stopped is a
bad thing? Still, if every other car can cope, maybe I shouldnt worry!
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stephen_gusterson
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| posted on 8/5/02 at 09:50 PM |
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I recon its ok.
When I had my jag V12 a couple years back, a reccomended mod is to have a timer relay make a supplementary fan come on for 2 or 3 mins. This is cos
the old V12 is a shoe horn fit, and is a friggin great lump of heat containing 28 pints (yeah!) or water.
The heat soak is supposed to degrade rubber and plastic bits after a while and sometimes cause difficult starting. You dont wanna be push starting a 2
tonne automatic car.
ATB
Steve
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stephen_gusterson
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| posted on 8/5/02 at 09:51 PM |
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typo.....
Its 38 pints actually - and 20 pints of oil.
steve
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