OverHeating

[ullevi]

I have had the problem of overheating on my Golf for the last few weeks and have put it into the garage on 2 occasions to have this sorted. It is a MK5 1.4 with 38,000 miles on the clock.

1st visit they replaced the water pump as they said there was a hole in it and then did the cam belts at the same time which they said would remedy the problem. This failed to sort the problem but did stop the leaking coolant. They also replaced the thermostat as they said the piece that broke of the water pump had gone through the thermostat.

I then put it back to the garage after it was still overheating after short runs and long runs and they said one of the relays had been boiled which they assured me was a common problem.

I was away for the weekend and after a long run i thought i would leave the car running whilst it was stationery and the heat just kept going up until the red light came on again.

What advice could anyone gove me on this problem??

[AlanD]

Are you losing coolant or are the coolant levels staying normal but just not circulating properly thus overheating the car?

[ullevi]

At the start it was losing coolant all the time but now it seems to be holding the coolant but still overheating, as i have said they have replaced the water pump, thermostat and a bolied sensor.

[AlanD]

I had issues with my coolant. I was losing coolant at the flange where it enters the system. Have a quick read of this thread, might be of use.

http://www.golfgtiforum.co.uk/index.php?topic=100997.0

[ullevi]

They have done a pressure test on the car and said it is not leaking anywhere

Seems to be something small but annoying not getting it fixed!!

[AlanD]

If the pressure test came out fine that implies there is no leak or blockage in the system. Ummmmmmmmmmmmmmmm

[ullevi]

Exactly

They have run it on the computer as well and say that there are no problems showing up with that either, the one problem it showed was the boiled sensor and they fixed that, a real head scratcher

[ub7rm]

Presumably the pressure test was a static test which wouldn't have shown up any blockages - the pressure would just merrily push against the blockage.

I'd bet that there are bit of that water pump in your system somewhere causing you grief.  Wouldn't take much to block the rad...

Are your fans kicking in properly albeit not helping the situation?

[ullevi]

The piece of water pump he showed me that had come of looked like a big bit but could well be that is the problem.

The temp seems to rise if stuck in traffic, if on a long run it seems to be fine on the long run but as soon as you stop in traffic the temp will start to rise and if the jam is big enough it rises to 130 degrees everytime!!

The coolant seems fine now and settled at a steady level, I marked it with a pen last week and it seems to be fine.

If there is a blockage how would the gargae find out where it is?

The fans seem to kick in fine at all times

[ub7rm]

It would be very difficult to find, I guess trying to dislodge it by taking components apart and pushing water at high pressure through them would be one way.

Another thought is that its not beyond the realms of possibility that they fitted a duff pump.