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Help! My Astra is overheating.I have narrowed the fault down to a faulty cooling fan 1st speed resistor,but i can't find the offending item.Any one know where i should be looking????
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OOOOps might be important,i forgot to mention,it is a 1997 model!
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I remember when I bought my second hand Astra 1.7TD [Izuzu]the heater fan did'nt work at all , it was a device that looked alot like a balast resist thingy! on older cars . I replaced it and the heater worked on all speeds and contiues to do so. It was situated under the bonnet , just passed the middle towards the passenger side where the wipers are situated. Not on the engine side of the bulk head. Hope this helps.
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I *think* buddha is refering to the radiator fan, rather than the blower fan for the passenger compartment.
Perhaps he can clarify?
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Sorry for any misunderstanding,but yes,i was referring to the radiator fan!!! I am told that it probably looks like a ballast/ceramic resistor,and my unfriendly,totally unhelpful local Vauxhall dealer,said it resides on the fan cowling.Well i have looked and looked and looked and it definately is not there!Any other ideas? I am getting desperate!
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I would also be interested in how buddha has diagnosed the fault as the resistor, and how he knows that his car is so equipped.
How many wires go to the radiator fan switch?
number_cruncher
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Hi cruncher,thanks for the interest.Anyway,the radiator thermo switch has three wires,one of which goes to earth,the other two,when earthed,actuate separate relays,located in a box in the engine compartment, on the bulkhead.One of these relays made the fan work at full pelt,the other did nothing.The one that did nothing is the first relay to actuate as the engine gets warmer.I checked it for juice,but none getting to it,fed by fuse 26 which is juiced in and out.Fuse 26,according to the Autodata 2004 CD is radiator fan(resistor).The vauxhall TIS CD,which is a nightmare to use(must be doing it wrong),was no help at all,but did mention that fuse 26 is an item to be fitted FOC,should customer complain of overheating.The relay it feeds has thinner guage power wires than the other one,so i am guessing that the resistor is somewhere between the relay and the fuse.My local Vauxhall dealer,reckons it is probably mounted on the fan shroud,but then he has also denied it's existence for the past couple of days!!! I have replaced the thermo switch(£35),and double checked both relays,all AOK.
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A lot of these Astra T/ds were wired for 2 speed cooling fans but only had single speed system fitted.The resistor is fitted either on fan cowling or down near battery support frame.You can activate the fan to operate at first temp setting by changing the wires around at thermo switch or relay box at bulkhead.
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Hi laughing budda,
I think the advice given by elekie&a/c doctor represents a very good way to fix this problem. The slow speed fan setting is just a nicety to reduce the noise made by the fan.
One other thing to look for is that sometimes these circuits aren't connected up properly from new - it *should* be picked up at PDI time, but some are missed. :-)
number_cruncher
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Switching the wires at the relays sounds like a good fix,but that fan is very noisy!!Anyway,it is bugging me now,and if i have to take the car to pieces,bolt by bolt,wire by damn wire,i will eventually find the resistor or whatever magical bit of tomfoolery Vauxhall came up with to supply that reduced voltage!!!
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Hi, interested to know if you solved your problem. I too have an astra with fan problem.Fan kicks in at over a 100 on full but not the lower speed. I have a voltage of about 9.5v at the fan but this does not operate the fan
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good way to fix this problem. The slow speed fan setting is just a nicety to reduce the noise made by the fan.
In a diesel? Wow, those fans must be loud to be heard over the engine noise ;o)
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Agreed - the only time I've ever heard my cooling fan on my Xsara 1.9TD come on was after a 20 minute ascent of a steep, slippery, unpaved hill that had a 1/4 gradient most of the way up. Got to the top with the temp needle just under the red, and left it idling for 10 minutes to cool down.
Temperature dropped remarkable quickly once the fan kicked in though, it was very noticeable from outside the car, but couldn't be heard inside.
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