james read
New Member
Hi my disco 300tdi 1996 is overheating and the heating is only blowing cold can anyone advise me on what's coursing this I'm not a mechanic so layman's terms please
julianf
Well-Known Member
Air lock is the #1 thing to ensure against -
If the heater is only blowing cold, there is no flow through the head (as the heater matrix is in series with the head) This could be for various reasons, but the easy one to make sure of is that the pump isnt air locked.
First thing to do is cut the top off a 2ltr coke bottle, to make a large funnel.
Loosen the bleed screw on the top of the thermostat housing (google 300tdi bleed screw if you need to)
Start the engine, and then hold the coke bottle funnel tight into the headder tank, and fill it with water, so as the level is way above evreything else in the engine bay. When air stops comming out of the bleed screw, get a friend to nip it up whilst you still have the coke bottle full.
Leave the headder tank top off whilst you bring the engine up to warm. With luck, the pipe that comes out of the head will now get warm. If it does not then you have other issues, but the above is the very first thing to try.
If this works, suck some water out of the headder tank (syringe etc) to bring it to the correct level, and youre done.
If the heater is only blowing cold, there is no flow through the head (as the heater matrix is in series with the head) This could be for various reasons, but the easy one to make sure of is that the pump isnt air locked.
First thing to do is cut the top off a 2ltr coke bottle, to make a large funnel.
Loosen the bleed screw on the top of the thermostat housing (google 300tdi bleed screw if you need to)
Start the engine, and then hold the coke bottle funnel tight into the headder tank, and fill it with water, so as the level is way above evreything else in the engine bay. When air stops comming out of the bleed screw, get a friend to nip it up whilst you still have the coke bottle full.
Leave the headder tank top off whilst you bring the engine up to warm. With luck, the pipe that comes out of the head will now get warm. If it does not then you have other issues, but the above is the very first thing to try.
If this works, suck some water out of the headder tank (syringe etc) to bring it to the correct level, and youre done.
james read
New Member
Thanks for advice I've found the problem heater matrix was leaking bypassed that but still overheating. So I think it's time to delve deeper so off with her head turns out head bolts some tight some loose hence gasket fail water sitting on pistons. Some idiot has tryed doing a job and chucked it back together
Attachments
james read
New Member
Marmaduke
Well-Known Member
There's no way you could have that much water in the pistons without doing some very serious damage if you had the engine running.... Did you drain the block fully before you removed the head using the bolt on the side of the block by the exhaust manifold? That amount of fluid would have caused the engine to seize and bend the con rods
Marmaduke
Well-Known Member
That looks OK to re use to me, I would recommend scraping any crap off with a stanley blade or similar before worrying about a re skim
