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Model specific boards => Golf mk3 => Topic started by: VWstevo on 01 March 2010, 08:17

Title: My Fan Stayed On All Night On My Gti Mk3 8v
Post by: VWstevo on 01 March 2010, 08:17
Hi Again

Ok, either someone drove my car before going to my car this morning or somethings not right lol.

When i went to my car this morning my fan was on. It must have stayed on all night or since 7pm until 8am this morning. What would make the fan stay on all this time. Strange.

Cheers Guys.
Title: Re: My Fan Stayed On All Night On My Gti Mk3 8v
Post by: DrewGTI on 01 March 2010, 08:38
Hi mate, I had the same problem on my old gti.
It turned out it was a little black unit that sits under your coolant bottle.
Water had came out the overflow and damaged that and the plug that
goes into it.

Worth checking that for any damage bud.
Title: Re: My Fan Stayed On All Night On My Gti Mk3 8v
Post by: VWstevo on 01 March 2010, 08:44
Hi mate, I had the same problem on my old gti.
It turned out it was a little black unit that sits under your coolant bottle.
Water had came out the overflow and damaged that and the plug that
goes into it.

Worth checking that for any damage bud.
[/quote


Cheers matey, will check it out.
Title: Re: My Fan Stayed On All Night On My Gti Mk3 8v
Post by: VWstevo on 01 March 2010, 19:02
Hi Again

Ok, either someone drove my car before going to my car this morning or somethings not right lol.

When i went to my car this morning my fan was on. It must have stayed on all night or since 7pm until 8am this morning. What would make the fan stay on all this time. Strange.

Cheers Guys.

Found out the water pump might be on it's way out or packed up. The header tank was pushing the coolant out of the over flow due to the engine getting too hot and the water pump not working correctly. Would this cause the fan to come on and stay on longer than usual, except all nite though lol.
Title: Re: My Fan Stayed On All Night On My Gti Mk3 8v
Post by: DrewGTI on 01 March 2010, 19:30
Did you check that little black unit?
Title: Re: My Fan Stayed On All Night On My Gti Mk3 8v
Post by: Wayne on 01 March 2010, 19:37
If it is staying on then I would suggest a wiring or switch problem.
Title: Re: My Fan Stayed On All Night On My Gti Mk3 8v
Post by: VWstevo on 01 March 2010, 19:40
Did you check that little black unit?

Hi Drew

I did have a look at it and yeh the water from the over flow from the header tank was pissing water all over it. It's a TW*T to get off or do you have to take the bottle of to get to the top of it. What did you do with your mate to fix the problem. Thanks.
Title: Re: My Fan Stayed On All Night On My Gti Mk3 8v
Post by: DrewGTI on 01 March 2010, 19:48
the water from the over flow messedthe unit up, blown the fuse you see at the top but also form the look of it got into the unit and also rusted the plug. . . swaped the unit that only bolts to the coolant bottle by two bolts then had to cut off my plug (yours could be ok) and wire ina new one. fiwed the fan staying on which was got as it used to flatten my battery!

reason for my overflow was the head was on its way out mate....
Title: Re: My Fan Stayed On All Night On My Gti Mk3 8v
Post by: bobbito on 01 March 2010, 19:49
Good luck with this because mine did this just after all that snow. Turns out the water pump packed in which was caused by the weather and a head gasket gone. Have a look down the black tube which runs over the timing belt cover. I looked at mine a few times on the dipstick and under oil filler cap. Then when I found out what it was and started stripping the head that pipe was full of yellow mayonaise. I had Replaced the fan control unit under the expansion tank, the temp guage and the fan swith on rad befor I found out it was a head gasket too.  
Title: Re: My Fan Stayed On All Night On My Gti Mk3 8v
Post by: VWstevo on 01 March 2010, 19:54
Good luck with this because mine did this just after all that snow. Turns out the water pump packed in which was caused by the weather and a head gasket gone. Have a look down the black tube which runs over the timing belt cover. I looked at mine a few times on the dipstick and under oil filler cap. Then when I found out what it was and started stripping the head that pipe was full of yellow mayonaise. I had Replaced the fan control unit under the expansion tank, the temp guage and the fan swith on rad befor I found out it was a head gasket too.  

Yeh just had new head gasket fitted and timing belt etc. It's just started to do it 2 days ago, i think the water pump is on it's way out as the water is making it's way out of the expansion tank through the overflow onto the switch below. It's not the head gasket so i think the pump as gone or going causing the water to get too hot in the engine and the water pump is not kicking in. Where did you get the new box from with the fuse etc. Thanks.
Title: Re: My Fan Stayed On All Night On My Gti Mk3 8v
Post by: DrewGTI on 01 March 2010, 20:11
local breakers for like £15!

make sure if you replace it its the right engine code.  :smiley:
Title: Re: My Fan Stayed On All Night On My Gti Mk3 8v
Post by: VWstevo on 01 March 2010, 20:19
local breakers for like £15!

make sure if you replace it its the right engine code.  :smiley:

If i get one of another golf gti mk3 same year or 1995/6 will that be ok do you think. Just that there's one in a srap yard near me.
Title: Re: My Fan Stayed On All Night On My Gti Mk3 8v
Post by: bobbito on 01 March 2010, 21:18
It's likely to be the same but there about 4 different types with the same part number but differnt last letter. I paid a tenner private breaking. If you go to get it take a size 28 (I think) ring spanner or adjustable grips and pocket the temp swith off the rad in front of the battery as these can die to. Also a new expansion tank cap too. Ive seen the seals go which don't allow the system to pressurise = expansion take violetly loses water.
Title: Re: My Fan Stayed On All Night On My Gti Mk3 8v
Post by: VWstevo on 03 March 2010, 21:04
Good luck with this because mine did this just after all that snow. Turns out the water pump packed in which was caused by the weather and a head gasket gone. Have a look down the black tube which runs over the timing belt cover. I looked at mine a few times on the dipstick and under oil filler cap. Then when I found out what it was and started stripping the head that pipe was full of yellow mayonaise. I had Replaced the fan control unit under the expansion tank, the temp guage and the fan swith on rad befor I found out it was a head gasket too.  

Yeh just had new head gasket fitted and timing belt etc. It's just started to do it 2 days ago, i think the water pump is on it's way out as the water is making it's way out of the expansion tank through the overflow onto the switch below. It's not the head gasket so i think the pump as gone or going causing the water to get too hot in the engine and the water pump is not kicking in. Where did you get the new box from with the fuse etc. Thanks.

Hey guys

Sorted he fan issue out. I took the box off underneath the expansion tank and shuck all the water out of it, Dries it with the hairdryer lol and put it all back together and now it's fine hehe, hope it lasts
Title: Re: My Fan Stayed On All Night On My Gti Mk3 8v
Post by: bobbito on 03 March 2010, 21:10
Tenner says I'd doesn't. Nothing is ever that easy on a mk3  :rolleyes:
Title: Re: My Fan Stayed On All Night On My Gti Mk3 8v
Post by: VWstevo on 03 March 2010, 21:15
Tenner says I'd doesn't. Nothing is ever that easy on a mk3  :rolleyes:

lol. don't say that Bob, i've changed that many parts on my golf I could have built 1 from scratch dude.
Title: Re: My Fan Stayed On All Night On My Gti Mk3 8v
Post by: spunkymonkey on 03 March 2010, 21:32
The battery must have been proper flat when you got to it!  :smiley:
Title: Re: My Fan Stayed On All Night On My Gti Mk3 8v
Post by: VWstevo on 03 March 2010, 21:36
The battery must have been proper flat when you got to it!  :smiley:

I took the fuse out spunky at the side of the box. Took the tank off and ding dan doo there she was, owt else goes wrong mate , cliff he we come lol.

Only joking spent a few k on it ow with the LPG gas conversion and all the new parts and parts i've changed. Just need new ays and respray and she back to it' original glory. hehe.