Slight Over Heating....

[skott]

Ok guys, out bush the otherday and was working my 96 disco 3.9 petrol pretty hard, I looked at the temp gauge and she started to get hot, like just over half. I pulled over and she started to steam and lost about 0.5 of a litre out of the overflow tank. The question I want to know is... Should the Thermo fans for the air con come on even if the air con isnt on? or does the clutch fan do all the work?

I never have problems just cruizing around town and on normal country roads, the temp always stays at half... I have had a full radiator service and a top overhaul in the last 6 months....

One other question! I have a waterfall sound behind my dash which I think may be a sign of a blocked heater core? would I correct and can this affect the temperture?

 

[skott]

I'm not losing any coolant from hoses or using any water? Clutch fan seems to be working fine! I;m thinking the heater core maybe the problem? or if not maybe faulty thermostat/water pump, would it be a correct assumption to take it to a lr mechanic to sort it out? otherwise I was thinking of changing temp sender and coolant temp sensor and thermostat! Seemed it only overheated whilst working hard!

 

[joey]

The sound you are getting is normally cause by either low Antifreeze level or the heater core may be clogged.

The A/C fans will only kick on the the T-Stat says you have become hot. Unless the fans either a) don't work, or b) the relay isn't working correctly.