Coolant issue.

[francophile1947]

Was your alarm fitted before you had the head replaced (and did it work before)? Let's hope it's not a newly fitted alarm with the screw too high in the tank

[mikelamb]

The alarm was fitted before and I have checked the position of the screws. It all looks fine. I wish it was that to be honest, can't help but fear the worst on this one!
Strangely though, the alarm was sounding when I jumped into the van after work, but when I looked in the expansion tank there was enough coolant in there. Could that be to do with the pressure in the system ?
After I opened the bottle the alarm was ok.

[widdowson2008]

Why did you change the head in the first place? Cooked?

[haydn callow]

when you opened the bottle the pressure was released and the level of coolant would rise a little and shut the alarm up.

Your alarm is working as it should.....when the level of coolant drops below the top (sensor) screw then the alarm will sound...
The fact is you are losing coolant some how......and the alarm is bringing this to your attention.

I never had to add any coolant to my recently sold Bongo in 3 years.

[haydn callow]

It's very difficult to judge the coolant level in the tank by looking down the filler hole.....much better to "dip" it or relie on the coolant alarm...

[mikelamb]

Thanks Haydn, I thought it would be due to the pressure being released, allowing the coolant to rise.
Hopefully I have a leak somewhere. She is going back to the Garage to get checked out soon.
Mike.

[mikelamb]

Why did you change the head in the first place? Cooked?

Yes.

[widdowson2008]

Why did you change the head in the first place? Cooked?

Yes.

Did you change the stat at the same time?
Reason for asking is that a cooked stat CAN get stuck in the open position - this would explain the cool running.

[The Great Pretender]

Is it pressure? I'm inclined to think that the problem could be caused by a vacuum due to a faulty valve in the header tank cap.

[mikelamb]

Is it pressure? I'm inclined to think that the problem could be caused by a vacuum due to a faulty valve in the header tank cap.

Thanks. Could this be the problem? How is the cap meant to work ?

[haydn callow]

TGP....if that was the case...would the pressure not equalize via the radiator cap.....???....just a thought

[widdowson2008]

I'll try again.
Did you change the stat when the head was changed?

[mikelamb]

I'll try again.
Did you change the stat when the head was changed?

Hi Steve,

New head with gaskets, new thermostat, coolant flush, engine flush, engine oil, oil filter, antifreeze, and new radiator.

Mike.

[widdowson2008]

I'll try again.
Did you change the stat when the head was changed?

Hi Steve,

New head with gaskets, new thermostat, coolant flush, engine flush, engine oil, oil filter, antifreeze, and new radiator.

Mike.

Eliminates stat faults then.

[missfixit70]

TGP....if that was the case...would the pressure not equalize via the radiator cap.....???....just a thought

Rad cap shouldn't vent, that's why the pattern part rad vents should be blocked off, doesn't matter what cap is on there either, as long as the top seal seals.