phill54
1170cc
70 mph in second gear come on baby[F4:phillip401]
Posts: 373
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Post by phill54 on Oct 13, 2011 21:27:30 GMT 1
hey all got another problem with my mini she overheats when standing on lights and some times when driving around
i have 2 fans fitted the standard one and a electric one fitted too
water pump seams to be working too as its pumping around
also i have no heater fitted
anyone have any ideas
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ljonez
turbo
Built not bought
Posts: 3,734
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Post by ljonez on Oct 13, 2011 22:14:50 GMT 1
stuck thermostat ?
fans working against each other ?
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Post by coedy on Oct 13, 2011 22:34:56 GMT 1
sling up a photo of the engine bay for eagle eyed lawson to see if your mechanical fan is on arse backwards  ;D |
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Post by jackdaw on Oct 14, 2011 8:00:33 GMT 1
Airlock in the system?
Had a water pump once that had most of its pump blades corroded away... spinning like a goodun but not a lot of water getting pumped around! ?
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ljonez
turbo
Built not bought
Posts: 3,734
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Post by ljonez on Oct 14, 2011 8:21:07 GMT 1
Had a water pump once that had most of its pump blades corroded away... spinning like a goodun but not a lot of water getting pumped around! ? Yep had the same aswell also have had the impeller snap off the shaft |
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Post by danielc on Oct 14, 2011 13:08:11 GMT 1
Have you changed anything recently - e.g. just taken out the heater matrix, just added the second fan? This could point the way to the guilty component.
Could just be good old crud in the radiator? Worth trying before you start doing anything expensive.
If the engine is pretty ordinary (?) then a single fan should be OK in all but the most extreme circumstances - and certainly if you are moving.
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phill54
1170cc
70 mph in second gear come on baby[F4:phillip401]
Posts: 373
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Post by phill54 on Oct 14, 2011 16:23:09 GMT 1
thanks for all the help ill get a photo up asap of engine bay the car has no thermostat in it as i have no heater in the car going to check the water pump tomorrow !!!!!!!! what about head gasket could this the problem  ? but there is no oil in water !!!! i have done nothing to the engine since it has started this problem |
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Post by jackdaw on Oct 14, 2011 16:47:13 GMT 1
I've had some funny symptoms from faulty head gaskets as well in the past and it is possible that a water channel is leaking into a cylinder via a faulty head gasket, but you would be seeing steam/smoke out of the exhaust when accelerating hard and performance would be down No biggy to change the head gasket really if you have any doubts.  How is the rad water level keeping ? Are you having to top it up more often ? Any signs of water leaks under car when the engine is running? Silly question time - are your top/bottom hoses in good nick and clipped up tight |
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phill54
1170cc
70 mph in second gear come on baby[F4:phillip401]
Posts: 373
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Post by phill54 on Oct 14, 2011 17:11:06 GMT 1
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phill54
1170cc
70 mph in second gear come on baby[F4:phillip401]
Posts: 373
|
Post by phill54 on Oct 14, 2011 17:13:05 GMT 1
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phill54
1170cc
70 mph in second gear come on baby[F4:phillip401]
Posts: 373
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Post by phill54 on Oct 14, 2011 17:18:21 GMT 1
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phill54
1170cc
70 mph in second gear come on baby[F4:phillip401]
Posts: 373
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Post by phill54 on Oct 14, 2011 17:19:46 GMT 1
hey jackdaw performance is still great no leaks and its not using water all hoses tight
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Post by jackdaw on Oct 14, 2011 17:26:44 GMT 1
OK Is your electric fan running all the time or on a stat/switch? If your electric fan is fighting against the engine fan when it comes on that could be your problem ? You can easily reverse the direction of the electric fan by reversing the 2 electrical connections on the fan lead. |
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phill54
1170cc
70 mph in second gear come on baby[F4:phillip401]
Posts: 373
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Post by phill54 on Oct 14, 2011 17:37:15 GMT 1
yeah pal the electric one is on a switch i only put that on too try and solve the problem
does the engine fan look like its on the right way too you
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Post by jackdaw on Oct 14, 2011 17:43:15 GMT 1
You can only fit it the one way on the rad but you can wire it so it runs either way, if you see what I mean? The way to check correct operation is to run the engine without he lecky fan and see if air is being blown through or sucked through the rad. Then switch the lecky fan on and check that the blow or suck is increased. That will mean that the lecky fan is correct. If the blow or suck is being cancelled out (or even reversed!) then the lecky fan is wired the wrong way and needs to be reversed. Clear as mud ;D |
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phill54
1170cc
70 mph in second gear come on baby[F4:phillip401]
Posts: 373
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Post by phill54 on Oct 14, 2011 17:51:07 GMT 1
cool pal i get what u mean
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Post by dai9fxey on Oct 14, 2011 18:49:28 GMT 1
I'll have to double check, but I think the yellow fan is on back to front. If that is the case the fan won't be as efficient with blowing air through the rad. The lecky fan looks a bit close to the rad which could impede airflow as well. Could be a culminatiom of both the above factors which could be causing the overheating problems. |
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Post by danielc on Oct 14, 2011 19:02:09 GMT 1
Is the thermostat actually anything to do with having or not having a heater? I thought it just controlled the circulation of coolant through the radiator/block? You could have or not have a thermostat regardless of whether or not you have a heater?
Twin fans still seems like an extreme solution to me, what sort of radiator is it? If the engine really needs more cooling, mightn't it be simpler to put a better radiator in and take away the second fan? I always prefer a simple solution!
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Post by danielc on Oct 14, 2011 19:08:41 GMT 1
Just noticed you have no inner wings, surely that should be providing you with extra air flow. Unless your engine is a real beast I can't believe you need the two fans, unless there is some other problem with the cooling for some reason.
If it was head gadget trouble, wouldn't you expect to see nasty white gunk in the oil filler, that the typical sign?
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Post by jackdaw on Oct 14, 2011 19:36:15 GMT 1
The engine thermostat is there so that the engine warms up to temp quicker than having the water circulated from a cold start. Once the engine temp opens the engine stat water from the rad is allowed through the engine to cool as normal.
The heater is an auxiliary hot water loop for comfort inside the car only and has nothing to do with engine cooling or the engine stat (other than taking some additional heat away from the engine to inside the car).
I've had a lecky fan fitted to my 1380 from the start and while it was controlled by its own stat I never heard the fan kick in at all and never had any overheating problems.
I then managed to smash the lecky fan stat one day so I wired it up through a switch on the dash. Again tho I never needed to use it as there was still no overheating problems, even in heavy or stationary traffic.
This shows that if the cooling system is working correctly as it was designed to do, there is no need for a secondary lecky fan.
As Daisy pointed out the addition of a lecky fan can actually block some of the airflow through the rad and cause some overheating of its own by just being there.
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;D
? but there is no oil in water !!!!
