Overheating/Pressure build up problen

gforcegraham · Oct 10, 2012

Hi all need help?????????

After 10 miles my 1.8 dumps its water? so far the HG has been done, new expansion bottle & cap and yesterday new thermostat & housing.

Been on a run and its done it again and when i felt the bottom hose it was cold, the 2 fans where running but rad felt cold so checked but not blocked. No signs of oil in water or water in oil.

Any suggestion

Graham

WLJayne · Oct 10, 2012

When you say it dumps its water what exactly are you saying? Is the water leaking? Problems like this may be multifaceted, I only solved mine by replacing all of the hosework and intalling an simple loop system with an electric water pump. The whole cooling system in the K series is a bit naff and benefits from attention. But that was just me being adventurous, I'm sure yours won't need such drastic measures.

Will.

Diesel Do · Oct 10, 2012

gforcegraham said:
Hi all need help?????????

After 10 miles my 1.8 dumps its water? so far the HG has been done, new expansion bottle & cap and yesterday new thermostat & housing.

Been on a run and its done it again and when i felt the bottom hose it was cold, the 2 fans where running but rad felt cold so checked but not blocked. No signs of oil in water or water in oil.

Any suggestion

Graham

Try bleeding it properly! How old is it? Where's the thermostat? Does the rad get hot before it dumps it? Does the heater get hot? Is the thermostat opening? Bit more info needed

DD

Nodge68 · Oct 10, 2012

WLJayne said:
The whole cooling system in the K series is a bit naff and benefits from attention. measures.

Will.

Your are so rite. Quite who and why thought it would be clever to put the stat on the cold side of the rad is beyond me. A lot of the lotus guys use a normal pre-rad stat on there K series engines !!

The Mad Hat Man · Oct 10, 2012

It was done to reduce thermal shock. It just seemed to have caused bigger problems.

Diesel Do · Oct 10, 2012

Like all Freelanders being slagged off

DD

The Mad Hat Man · Oct 10, 2012

Justifiably

Nodge68 · Oct 10, 2012

The Mad Hat Man said:
It was done to reduce thermal shock. It just seemed to have caused bigger problems.

I fail to see the logic!! There is more thermal shock suddenly dumping over cooled water into an over hot engine?? It's miles better to allow the engine to heat up and slowly bleed it's hot water swapping it with cooler water from the rad?

The Mad Hat Man · Oct 10, 2012

The logic was....
On an overcooled system, having the thermostat on the engine output... The thermostat would open, pushing very cold water from the rad into a hot injun. By putting the thermostat on the return side, the coolant temp could be better controlled. Unfortunately this meant that the injun could boil before the thermostat opened

.

Hence that's why it is possible to have a cooked injun and " the temperature gauge never rise above midway"

Nodge68 · Oct 10, 2012

The Mad Hat Man said:
The logic was....
On an overcooled system, having the thermostat on the engine output... The thermostat would open, pushing very cold water from the rad into a hot injun. By putting the thermostat on the return side, the coolant temp could be better controlled. Unfortunately this meant that the injun could boil before the thermostat opened .

Hence that's why it is possible to have a cooked injun and " the temperature gauge never rise above midway"

You would have thought the designers might have thought it would cause reliability problems long and not so long term? The sudden cooling is compounded by the engines light weight too. I think engine mass is the only thing stopping the KV6 going down the same HGF route as it weighs twice as much as the 4 pot!!

The Mad Hat Man · Oct 10, 2012

Nodge68 said:
You would have thought the designers might have thought it would cause reliability problems long and not so long term? The sudden cooling is compounded by the engines light weight too. I think engine mass is the only thing stopping the KV6 going down the same HGF route as it weighs twice as much as the 4 pot!!

But it does!
The KV6, it can be argued is as bad as the 1.8. It is the same basic design, the rear bank of the V is against the bulkhead and therefore gets little or no air cooling and the thermostat is hidden in the V and regularly cracks, loosing coolant where it can't be seen, until you remove the covers to replace the, by then fried, heads

.

Do not be complacent. Sequential HGF is likely on the KV6!

Diesel Do · Oct 10, 2012

You really are a depressing chap!

DD

Diesel Do · Oct 10, 2012

Did I mention my 1.8 still hasn't blowed up

DD

The Mad Hat Man · Oct 10, 2012

Diesel Do said:
You really are a depressing chap!

DD

I wyd prefer "realistic"

Diesel Do · Oct 10, 2012

They're great

very reliable a long as you don't drive em

DD

gforcegraham · Oct 10, 2012

Hi what i mean by dumped is the water blows out through expansion bottle cap, both are new, the thermostat is in a plastic Y junction, again its new. ive blown through the rad and thats clear.The heater blows hot when driving then cold when at idle.

Graham

The Mad Hat Man · Oct 10, 2012

Diesel Do said:
Did I mention my 1.8 still hasn't blowed up

DD

I accept that. There are some good (lucky?) ones out there. If it goes wrong you have the skills to fix it. I've never said " don't buy one", only go into it with your eyes open. It is prone to HGF. Either be prepared to fix it or have deep pockets. For you it is fine, for a mum with kids, the doozils are better options.

Diesel Do · Oct 10, 2012

gforcegraham said:
Hi what i mean by dumped is the water blows out through expansion bottle cap, both are new, the thermostat is in a plastic Y junction, again its new. ive blown through the rad and thats clear.The heater blows hot when driving then cold when at idle.

Graham

Heater shouldn't be cold at idle! Except when engine cold of course, I'd start with leading it properly and take it from there, have you used the two bleed points?

DD

gforcegraham · Oct 10, 2012

Hi DD 2 bleed points? only used the 1 on the heater pipe

Graham

Nodge68 · Oct 10, 2012

The Mad Hat Man said:
But it does!
The KV6, it can be argued is as bad as the 1.8. It is the same basic design, the rear bank of the V is against the bulkhead and therefore gets little or no air cooling and the thermostat is hidden in the V and regularly cracks, loosing coolant where it can't be seen, until you remove the covers to replace the, by then fried, heads .

Do not be complacent. Sequential HGF is likely on the KV6!

The KV6 is more reliable than the 4 pot but complacency will kill it!! I don't think many just die on there own though, it's normally a water leak that causes an air lock!! Oddly it's more reliable in an MG ZS than any other Rover??

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