anyone had trouble with overheating?

[rsnoble]

I have been haveing problems with my car cutting out, it started a couple of weeks ago after i gave it a bit of welly and sat in trafic for about 15 min, i let it call down and ot restarted!!

today iv been out makeing sure there is no air locks all wires were ok, i let the car idle and the fans kicked in i left it idleing for around 20 min and the fans were going all the time,

i took it for a hard drive after and let it idle after and the temp gauge went off the scale again!!

iv checked head gasket as well

has anyone got any ideas as its staring to p*ss me off
the rad seem hot all over,

i have twin fans as well both are working
i havnt got a temp switch in rad or the pipe going to rad
has anyone had problems with flow ie, the water pump?

any help or check would be great

thanks

[BobE]

Sounds to me like the thermostat might be jammed partially shut restricting the water flow - worth looking at if you`ve eliminated other possible causes.

[rsnoble]

apart from the pump that is only other thing i can think of, i may try and get it out and see, seem funny it doent overhead on normal driveing?

[joust]

Above around 20mph the fans are for all intent and purpose redundant AFAIK and actually restrict flow. I do belive most of the race cars don't have a fan.

To that end look at the thermostat or there must be something wrong with your pump?

J

[rsnoble]

I think im going to hav too get the thermostate off and see if it is opening fully, everything seem to piont to that, i gues if it was the pump it would over heat all of the time,

thanks lads

[mr2turbo300]

The factory changed my pump a few years ago and they had the part in stock, so perhaps not as uncommon as you might think.
(Mine's a 3 though so I guess the P/N would be different.)
Regards,
Rob.

Edited by mr2turbo300 on Sunday 30th August 15:28

[Jim O.]

If you haven't already, you might try cleaning out your radiator, especially between the A/C condensor and the radiator core. Also, remove the fan shroud to clean the top of the radiator.

Otherwise, it kind of sounds like a water pump to me - works well enough to circulate water at higher RPMs, like when you're flogging it, but not well enough to circulate enough water at idle...

Edited by Jim O. on Monday 31st August 06:26

[art411y]

was at a show yesterday and the mondeo st owners club were there.i asked about common problems with the motor after highish miles .it seems the water pump has plastic veins that over time and distance do shred the veins.they have a firm that manufactures metal veined pumps to get over this problem..not sure if the pump in the noble is the same though

[rsnoble]

You may be on to something there, vw have the same problems, from factory they are plastic and the vains break off the patern part water pump are metal, next question has anyone got any idea of how hard they are to fit or change?

it could well be the vaines

[art411y]

never taken one off but looked at it when the ecu was upgraded.thought at the time looks quite easy to do

[rsnoble]

i may have it out and see if the vaines are missing, be intresting to know