Vehicle & Technical > Discovery

Broke down today

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cardiff_gareth:
Hi guys,
Just to add to the 'to do' list I broke down on motorway today.
I knew something wasn't right as I had no heat coming through the heaters, even when playing with the heat settings. Then the temperature gauge went up high. Stopped straight away and turned off engine to avoid cooking it. After about 5 mins, started back up and off I went but only got a bit further down the M4 until she went into 'hot' territory so stopped again. Left it about 10 mins then restarted and went to limp into services as they were about 2 mins away from my location. As I get into services heat resumed and temperature came back down again  
Do you think dodgy thermostat or air lock in the system  
What would be your course of action. Disco is used daily so can't have it laid up on drive  
If an air lock can it be bled and what is the best way to do this  

DOHHHHHHHHHHHHHHHHHHHHHH

Range Rover Blues:
Quite possibly an air lock but you need to be sure.

So start by checking if it's used any water, low coolant could itself cause an airlock.

cardiff_gareth:
it was ok as I topped it up about 3 weeks ago as low. I just plonked the pre mixed coolent into the header tank. Will re-check tomorrow. If its low is there a way to bleed the system ?

Range Rover Blues:
If it's a V8 then depending on year there will be a brass plug on the pipes at the top of the negine.  Fill it here to avoid air locks (see, even Rover knew this would happen).

On a TDi I'm not as sure.

What I like to do is fill it right up whilst cold, then run the engine and as it warms up water will be forced out, so I open each fillerplug just a little to let the air out.

I also find that fresh water can sometimes produce air from no-where, so I use boiled water in the header tank, the boiling forces the air out.

stageonesimmo:
If its a 300 TDi.  When its properly cold - first thing in the morning.  To check the coolant leave the expansion tank cap on and undo the filler plug on the top of the thermostat housing - it SHOULD be full, if its not fill it till it is - don't worry about the level it will stay put as long as you leave the lid on.  Then with the plug back in, check and remember the level - if its too low top it up a bit and remember where it was (I use the seam of the expansion tank as a gauge as I cant for the life of me see the daft 'X' shaped thing in the tank) then drive it as normal and see what happens......

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