My Discovery TDI300 started overheating yesterday when doing sensible motorway speed - hardly a hot day!!!
I had the heaters on full blast to try and warm the inside up but it was just blowing out cold air, and temp gauge got very high. I was about to pull over when all of a sudden warm air came out of hearters and temp gauge went straight down. Fine for rest of journey. Then a couple of hours later when driving somewhere else same thing happened. Any ideas?
I know nothing about the 300tdi, but sounds exactly like a stuck (now unstuck!) thermostat to me. Although I thought the heater is normally on the "engine side" of the thermostat so the heater should have had hot water. So now I'm not so sure....
Andrew
In news: snipped-for-privacy@k78g2000cwa.googlegroups.com, Ga wibbled :
Short of water?
Surely if it was short of water then it would just keep overheating??
I tend to think that it may be more along the lines of thermostat (or something else) sticking as Andrew said because all of a sudden hot air comes from heaters and tem gauge rapidly drops back down.
In news: snipped-for-privacy@v45g2000cwv.googlegroups.com, Ga wibbled :
Not necessarily, you can get a nice little airlock in the heater matrix, while the engine/radiator is full.
Check the strength of your antifreeze.
I also thought about an airlock just after I posted about sticky thermostat. I reckon its one or the other.
Or of course a blockage caused by ????
Andrew
Air lock. Bleed carefully and try again.
Er, why?
On or around 9 Feb 2007 02:30:56 -0800, "Ga" enlightened us thusly:
Coolant level low, check it pronto and watch it like a hawk.
It could be a gasket (such as the water pump or the P gasket or the thermostat housing, or it could be an early sign of head gasket going.
On or around Fri, 09 Feb 2007 11:43:50 GMT, "GbH" enlightened us thusly:
the 300 TDi is very prone to this if the coolant level is low. It only needs to be down an inch or so.
On or around Fri, 9 Feb 2007 17:11:40 -0000, "Rich B" enlightened us thusly:
could've been frozen somewhere.
If he'd just started, maybe - but if he's "doing a sensible motorway speed" I wouldn't have thought it likely an engine would develop a slush block unless he was driving in Siberia.
Are there any mods to monitor the coolant level that you know of?
On or around Sat, 10 Feb 2007 06:57:18 +0000, Graham Bowers enlightened us thusly:
erm... dunno. The sierra has a little float switch in the tank. I'm not sure if any of the RR classic/disco I family have 'em. in theory, it's not hard to do...
PRC7925 Water Level Sensor/Cap - Expansion Bottle - RRC from GA
fits the plastic expansion tanks (ESR63) fitted to most non-V8 Discovery I's, later Range Rover Classics, and Tdi Defenders.
Obvioulsy you'd have to wire up a light yourself.
The slight snag is they are £38.77 inc VAT each...... (ouch)
Richard
We've been here before. The plastic tank can take the float switch from the P38(?).
Thanks I popped up to Beamends this morning and came away with such a device. Cheers Graham
On or around Sat, 10 Feb 2007 13:06:10 +0000, beamendsltd enlightened us thusly:
IME the V8 discos have the same plastic tank.
I bet there's an unused coolant warning light position on the dash, too :-)
I'd never thought of that...........
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