overheating but no heating

[logoman]

Tonight my S1's temperature rose quickly to 110, and the heating failed to blow any warm air.
I parked, went for a meal with the Mrs and 3 hours later drove home, this time everything normal - temp 87 and nice and cosy.

any ideas as to what's playing up?

[ptp170]

Sounds like a change of thermostat maybe required...I'm not sure whether the heatermatrix is 'pre' or 'post' thermostat....but if it is 'post' then it ovbiously was wedged shut when the engine overheated as the water was prevented from flowing to the main radiator and to the heater matrix (thus no hot air + 110C).

On cooling down it has freed itself again and everything is a-ok once more.

Wouldn't recommend you drive it until it is replaced in case you warp your head (head gasket failure etc)



Then again I could be completely wrong if anyone else has any ideas?!?!??!

Edited by ptp170 on Monday 22 October 21:58

Edited by ptp170 on Monday 22 October 21:58

[Gooby]

There is air in the system, it needs bleeding.








either that or early onset of HGF

[porteouz]

Even with the thermostat closed the water still goes through your heater matrix, Could just need to bleed the system, had that problem with my old car. If there is an air block which by the sounds of it there is it can stop your heater working properly. Bleed the system and see how you get on

[miro]

my corolla had the same symptons engine overheating and no hot air. it turned out that the heater matrix had cracked and piddled all the coolant into the passenger footwell oh joy... hope its something simple

[ptp170]

porteouz said:

Even with the thermostat closed the water still goes through your heater matrix, Could just need to bleed the system, had that problem with my old car. If there is an air block which by the sounds of it there is it can stop your heater working properly. Bleed the system and see how you get on

So the matrix is 'pre' thermostat....has the water level dropped recently?? If so then air may have entered that way!

[logoman]

I'll check the waterlevel.
Is bleeding the system easy?

[Gooby]

logoman said:

I'll check the waterlevel.
Is bleeding the system easy?

Um... nope.

[ptp170]

This may help

http://wiki.seloc.org/a/Bleed_the_cooling_system 

[porteouz]

Gooby said:

logoman said:

I'll check the waterlevel.
Is bleeding the system easy?

Um... nope.

Its not as easy as say changing a wheel but i wuoldnt say it was hard, time consuming and fiddily. That guide posted is pretty good