2.5n/a overheating

RobMOD90 · Aug 28, 2013

Any ideas

My ex MOD 2.5n/a overheating, I have fitted new thermostat - new water pump - new temp sensor in cyl head - have removed rad and flushed out system with hosepipe and put back with new coolant. Still overheating though. The radiator though appears to be working as the top hose is very hot and the bottom hose feels just warm.
Not sure what else to try?

Cheers Rob

SmileySteve · Aug 28, 2013

Possibly blown head gasket, or worse still cracked head (cast iron so probably ok as good robust motor)

take it theres no obvious leaks.
Also make sure heaters turned on too for a while, get water flow through the whole system helps clear air locks.
Make sure expansion tank cap has a good seal on it too as if it doesnt hold pressure it will overheat and lose water.

RobMOD90 · Aug 29, 2013

Cheers looks like I will have to take the head off then.
Have tried with heater on and expansion cap seals well.

Oldseadog · Aug 29, 2013

Taking the head off should be the last resort!

Do you have any oil in the water or water in the oil?

Are you losing any coolant?

Have you flushed your heater matrix and made sure that there are no air locks?

Have you tried your new stat in a pan of hot water? Even the new ones can be faulty!

OK so if you want to make a big job out of it, then go ahead and start with the head ... otherwise go through the simple stuff first!

RobMOD90 · Aug 29, 2013

No oil in water and the oil, looks fine.
It has been running hot for a long while now and there has never been any loss of coolant but I do only use for short journeys.
I have not flushed out the heater matrix though so will give that a go and also test the thermostat.
Cheers

nrgserv · Aug 29, 2013

is it running hot to the extent its boiling and pushing steam from the header tank?
or just running hot according to the gauge?

RobMOD90 · Aug 30, 2013

Just hot according to the gauge the needle goes past the red as far as it can go.
The hose leaving the radiator at the bottom feels just warm so no steam from header tank, the hose from the engine to top of rad though feels very hot.

landowner · Aug 30, 2013

RobMOD90 said:
Just hot according to the gauge the needle goes past the red as far as it can go.
The hose leaving the radiator at the bottom feels just warm so no steam from header tank, the hose from the engine to top of rad though feels very hot.

try swapping wires with fuel gauge to test gauge. if not then sender unit faulty

2.5n/a overheating

RobMOD90

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SmileySteve

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landowner

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