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T4 overheating
amazer - December 10th, 2003 at 01:39 PM

Anyone had a problem with a 2.5 T4 randomly overheating? Will be fine for a week then overheat, then fine. New thermostat didnt help. Drilling a hole in thermostat didnt work. Auto electrician has checked it over and found nothing.

amazer - December 10th, 2003 at 01:40 PM

Sorry this should be in tech I guess. Someone will have to move for me.

modulus - December 10th, 2003 at 02:21 PM

I've got no experience with these, but understand that you have to bleed the cooling with the front end jacked way up, at least on ramps, preferably higher. Failure to bleed 100% can lead to random overheating...

hth

Andy - December 10th, 2003 at 02:49 PM

T2.5 is the T3 with an air cooled motor.
By overheating, is it on a gauge, or are there sides affects that make you say it's overheating?
Strange if it's random????

Bizarre - December 10th, 2003 at 03:07 PM

I had a Falcon that had a stuffed clutch on the cooling fan. It would slip or not engauge properly and although to look at it, it was spinning it just had no static as suck and was not pulling air over the radiator

Andy - think he means a new T4 kombi

modulus - December 10th, 2003 at 04:42 PM

I read this as a T4 with a 2.5 litre; either the peetrol or the TDI, but, hey I could be wrong...

Guy_H - December 10th, 2003 at 09:00 PM

Man its sad when nobody knows what a T4 2.5 is...:(:)

1 - check the T'stat - already done!
2 - Fan switch operation, is the fan switch cutting in (dual speed) at the desired temp?
3 - workshop time - impellers can spin on worn waterpumps.... Call us (or any competent watercooled VW mech from there)

Cheers

11CAB - December 10th, 2003 at 10:28 PM

Check the fuses that operate the fans they are in a small black box on the passenger side in the engine bay near the battery......they can crack and not always make contact.
Hope this helps

amazer - December 11th, 2003 at 11:52 AM

Yes its a 5 cylinder 2.5 litre petrol engined T4. Not a type 4.

Will check out fuses and see what happens.

Baja Wes - December 11th, 2003 at 12:31 PM

is the gauge saying it's overheating, or is fluid just overflowing the bottle.

With my V6 I had a weird problem where the water level in the expansion tank would go up and down all over the place. One minute empty, then overflowing, then empty, then overflowing, all on the same trip!

The temp gauge was also doing weird things, normal, a little hot, normal.

It ended up being just the radiator cap. sometimes it would hold pressure and sometimes it wouldn't. The seal in the cap dried up and went a bit hard when I had the car apart.