Fan Problem With My Mi

[tidypug 5 2 Cars]

I took my car for its mot today after standing about for nearly a year, it passed no problems. The only thing that did go wrong was it boiled over, strange as it has never done it before. The fan came on but only at the slow speed. I've tried a search but couldn't really fnd what i'm looking for.

[tom_m 0]

if its only coming on a t slow speed it sounds like your fan switch is buggered or you've got a loose connection to the high speed side of the switch. new switch and some contact jelly 'should' solve that one

[iety2004 0]

LOL Nightmare, this might not be your problem, but here goes

 

I had a similar problem in work today which turned out to be a head gasket on a 03 astra, came in with rad leak and lack of power,

 

when trying to start it, it wouldn't catch on the first go, but the second it would, some light white smoke came out the back, hmmm might just been sitting here for a while

 

i fitted new rad, road tested it, fans came in, still went off the gauge, i mean staight away, like a tacho or sumin,took it back to the work shop, and in the back of my mind i suspected a head gasket, i let th car cool to find, i hadn't had any leaks or any came out of the expansion take, so i removed the plugs to find them fouled up with white powder and gunk, so i pressuried the cooling system to find if the head gasket had gone

 

 

I used a coolant pressure testing kit, which (if you dont know) is a kit which has many different expansion cap top whichs attach to a hand pump with a gauge, find the right attatchments and start mumping taking to around 1 bar, and wait, if you losing pressure. I'm sure you could get a garage to do this for you rather than u buying a whole kit

 

on mine, with the plugs removed, cyl 2 filled all the way up in 10 mins, so head off

 

There are many different symbtoms of a head gasket going, but these two are good examples,

 

also

 

check to see if you car is using any coolant after you have driven it, check the heater materix pipes to see if they get hot to rule out an air lock, check the condtion of the plugs, check the oil cap for mayo and the dipstick for mayo or water substance

 

didn't mean to scare you by saying you headgasket has gone, but from what i've learnt today it is possible,

 

also osrry if i rabbited on, it nice to know the answer

Edited May 10, 2006 by iety2004

[Banjo 1]

Test the 2 speeds by putting a link into the plug thats normally dangling next to the fan resistor, its the one not plugged in to anything..

Ben

Edited May 10, 2006 by Banjo

[tidypug 5 2 Cars]

well i think i can rule out a problem with the head gasket. So far i have covered a massive 10 miles with this fully stripped, skimmed and pressure tested head on this motor.

I never had this problem before so i i suppose leaving it for this long period of time could well have done it.

So what do i need to look at? just the fan switch located on the rad? or is there a variable resistor as well like in a standard 1.9?

[tom_m 0]

So what do i need to look at? just the fan switch located on the rad? or is there a variable resistor as well like in a standard 1.9?

 

well that begs the question have you changed the wiring for the fan?

 

if you've still got the standard set up its most likely you're havin problems with the switch, because it switches between two different circuits; one with a resistor in (the slow speed) and one without (the high speed) since low speed works and high doesn't we can rule out the earth point (since they have a common earth). so that leaves you bad switch or bad connections. i found with a bad connection to the switch no fan speed worked, so IMO its most likley to be a burnt out switch

 

if you've fitted wiring other than came with the 1.9 then ignore what i've said cos i'm talking about a stock 1.9 set-up

[tidypug 5 2 Cars]

ah i see, well i've put the full Mi loom in for the engine conversion so i don't know if this makes a difference to the problem. I do know that i'm using the standard 205 rad and switch so i would have thought it would be the same.

[tom_m 0]

the fan loom 'should' be a completely separate entity to the engine management loom, well it is in the 8v anyway; you can trace its route from the positive distribution box to the switch to the fan and to the earth if you take your time.

Edited May 11, 2006 by tom_m

[jackherer 543]

the fan loom 'should' be a completely separate entity to the engine management loom, well it is in the 8v anyway;

 

thats right, the fan loom stays the same when you install an mi16, its got nothing to do with the engine loom.

[Banjo 1]

Did you not see my post? You can test the 2 fan speeds by bridging the brown plug..

[tidypug 5 2 Cars]

i did yes thanks.

 

I gave her a sturn talking to and it then it fixed itself. I think it was just a bad connection to the fan switch as thats the only thing i did.

 

 

thanks again guys