blakep82
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| posted on 6/1/11 at 06:01 PM |
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how do i know what fan switch to go for?
i've got a x20xev vauxhall engine from a 1998 astra (might have been a vectra, can't remember, the guy i got it from wa staking it out of
one to put in the other)
searching for a fan switch, there seems to be different temperature ranges for this engine in the astra 100-95 degrees, or there's a 2 speed
fan. will i need the 2 speed fan? i'll be using a ford transit radiator, would i only use the 2 speed fan switch if i had 2 fans?
also just found a 87-82 degree fan for the astra witht hat engine...
any guidance? 
think maybe settling for the middle 1 speed switch 100-95 deg is the safest option? lost
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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RazMan
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| posted on 6/1/11 at 06:19 PM |
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I would have thought that 95-100 degrees would be fine on a pressurised system - my fan is controlled by the ecu and comes on at 98 degrees. The 87-82
switch would be rather useless as the engine should be running happier in the higher temps.
The 2 speed fan is also a bit unnecessary IMO and I would keep it simple.
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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John Bonnett
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| posted on 6/1/11 at 06:19 PM |
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I'm very interested in the feedback on this question because I really do not understand why there are two switches for the same engine that
operate at such widely differing temperatures.
I'm running a three terminal switch that, through a resistor, gives half fan speed at 95 degrees and this switches to full speed at, from
memory, 101 degrees. Coming down, it switches from full to half speed at 97 and off at 92. I could have had a similar switch that operated in a
similar way from 82 degrees. My engine runs normally at between 80 and 90 degrees so the lower temperature switch would be coming on a lot of the time
at half speed.
Under normal running the fan on my set up only comes on after idling for some time or in slow moving traffic. You can watch the temperature rise and
at the pre-set temperature, the fan comes on first to half speed. This is quite acceptable and I would have thought this use would give a long fan
motor life and of course take less current which ultimately must be good for fuel economy.
However, one thing I have noticed on our Clio is that no matter what the conditions are, the temperature always stays the same. What I don't
know is whether this is brought about by a low temperature switch operating the fan on low speed for a lot of the time.
I'd be very interested in your views.
John
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britishtrident
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| posted on 6/1/11 at 06:23 PM |
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Check your thermostat temp, fan switch on temp should be well above thermostat opening temp but at least 5 to 10 degrees below the boiling point at
radiator pressure.
I would choose about 95 to 98c on 93 to 90 off .
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blakep82
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| posted on 6/1/11 at 06:45 PM |
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well, just got this one
eBay Item
if its not right, they've all got the same thread, so can change if i have to
thanks 
[Edited on 6/1/11 by blakep82]
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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RazMan
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| posted on 7/1/11 at 12:22 AM |
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That'll do you nicely
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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