944 nearly overheating ?

[interloper]

My car has a new and not very amusing trait basicaly the fan doesnt cut in to cool the engine until the temp guage needle hits the red line. Anyone else had this ? Is it the thermostat not opening soon enough or is it the fan switch not triggering the fan soon enough ?

Thanks in advance

Steve.

[dontlift]

should be faily simple to diagnose via heat in the pipes to / from the rad if the car is run stationary from cold until everything kicks in. although you may need to keep the bonnet down and rev it a little to get the temperature up initially as mine tends to run fairly cold anyway.

[bif]

Recently had the same thing, there is a sensor on the radiator which "tells" the fan to cut in and secondly the relay in the fuse box had become defective.
Mobile mechanic I use "9 Eleven Mobile" replaced sensor and I`ve ordered the relay
Hope this helps Barry

[larryG]

I've had the same on the 924. Think its the sensor but can't budge it so might have to get new rad as well.
Co-incidentally, my fuse/relay box was recently trashed while in the garage for servicing: car was left out, leaves under bonnet, rain filled battery compartment = water in the cockpit. The garage noticed something was funny when all the lights stopped working but maybe it damaged the relay as well ?
Larry
(P.S. thanks to dontlift for the earlier tip about sourcing a rad)

>> Edited by larryG on Thursday 7th August 15:30

[ninemeister]

Erm, rain goes into the battery tray all the time, so leaves or no leaves, the bottom line is water on fusebox = hole under battery. So, irrespective of the actions ofyour garage you have a more serious problem than leaves!

[larryG]

Yes, but when the battery tray is full it tends to pour into the car via the heater/air inlet.
This was never a problem as I used to take the battery out all the time as I had charging problems and was therefore always noticing and clearing out the junk. Since the charging problem was fixed (another story) I check it less often and on more than one occasion have opened the bonnet to find water almost level with the top of the battery or gone round a sharp corner and had water pour in onto my feet !

[ninemeister]

LarryG,

Now you're just telling everyone how dilligent an owner you are, I'd quit whilst you're still ahead!

[interloper]

Cheers chaps I've picked up a switch/sensor unit and a new relay. Will fit over the weekend, fingers crossed !