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Houston, we have a problem !

MRGT

MRGT

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Popped into town for some bread this morning and on way home temp gauge shot up into the red, managed to nurse it home and popped the bonnet. Engine very hot, but rad fan not running. Top of rad still cold, no heat from heater in car. I am going to assume the thermostat on the water pump has given up would this be correct, or is it something else ?
 
Why no heat from the heater though??? Does it have any coolant it?? I know it may sound silly but you should still get hot aor from the heater. It is usually a get out of jail card to drive home using the heater matrix as a surrogate radiator.
 

Just been out and checked it again now its cooled down, It looks to have lost some coolant, but not much, took about a litre to bring it back to its normal level, so its lost some somewhere.My only other thought is that the water pump has gone, I sincerely hope not given they are £200 [&o]
 
When something similar happened to me on the M11 some years ago (when I had the 944S) it turned out to be a hose low down at the back of the engine that had split - I think it was a heater hose. AA man managed to "southern engineer" a fix from something he had in the back of his van!
 
it could be one of several possibilities .
Thermostat could be jammed shut or blocked,
Air lock
The lining of a coolant hose could have collapsed internally
Radiator could be blocked with sludge (unlikely )
impellor has come off the waterpump shaft
waterpump belt broke or loose

It sounds like the water is being prevented from circulating up through the radiator which would leave the rad stat cold and the fan won't switch on.Might there be a valve anywhere preventing coolant flow just before the thermostat?
I have a schematic somewhere of the coolant flow I'll see if I can find it and post it.
yep here it is below from the Clarkes Garage website
 
There is no valve Nick it comes straight out of the block. My money is on a weeping pipe due to the loss of coolant and no heat from the heater. The heater matrix is pretty top of the system so a loss will affect it. An incorrectly bled engine will suffer from poor heating for example.
 
ORIGINAL: robwright

There is no valve Nick it comes straight out of the block. My money is on a weeping pipe due to the loss of coolant and no heat from the heater. The heater matrix is pretty top of the system so a loss will affect it. An incorrectly bled engine will suffer from poor heating for example.
Click to expand...

i thought that the thermostat circulates coolant through a bypass hose into the head until operating temperature is reached ?
My money is on the thermostat or an airlock( probably in the heater circuit as you say it is top of the system. If the hot coolant isn't circulating through the heater circuit then its like an airlock due to water loss as you say
 
Not with the post the way it is at the minute [:mad:] Still waiting on my new header tank cap from Max Schenker that was posted on the 4th!!!! Which reminds me when I fit it I am going to try and butcher the old one into a pressure bleeding jobby. MRGT you may need this. I wll pimp it out anyone that wants it for P&P [:)]
 

Well I tried to get it to the garage this morning, temp gauge shot up within a mile or so of leaving the house. Definitely looks as though coolant not circulating and no sign of anything dripping from underneath. Got on to green flag who relayed me to the garage. Just waiting for the dreaded phone call now :(

Howard
 
Sounds very like the symptoms I had with my S2 when the water pump impeller dropped off the shaft.

I'm with Nick's diagnostic thinking. Hopefully it will be a failed thermostat, which is cheap and easy (although a fiddle) to change.

Brace yourself if it is a waterpump. New pump + someone else changing it ... ouch. (Although it will be a great opportunity to have the belts changed as well!)


Oli.
 

ORIGINAL: MRGT


Well I tried to get it to the garage this morning, temp gauge shot up within a mile or so of leaving the house. Definitely looks as though coolant not circulating and no sign of anything dripping from underneath. Got on to green flag who relayed me to the garage. Just waiting for the dreaded phone call now :(

Howard
Click to expand...


When the impeler disintegrated on my Mondeo water pump I was able to drive through town for a couple of miles to the garage without the temperature getting near the red line. I did early in the morning so that I didn't have to sit in traffic.

The temperature gauge on my 944 is complete cack, it will regularly go straight off of the top of the scale and then suddenly go back to normal. On somedays it doesn't work at all and then it will be fine for months on end. The fan comes on when it needs to so I know that it is the gauge.
 

Oli, good point about the belts, they are due in around 5000 miles, so would make sense to get them done at the same time (if it is the pump)

Howard
 
Howard,

For your sake I hope it isn't the pump, but if it is then that silver lining may be fairly large; changing the belts is at least 80% of the work of changing the waterpump, and hence the only extra cost you would be facing would be that of the pump itself ... OK, that's not cheap, but it could be a chunk worse. And changing the pump is one of things that may be recommended every other belt change anyway.

(My pump went about 800 miles after the belts were changed ... the wrong way 'round entirely.)

If you do end up changing the pump then make sure you (or your garage) shops around for the best price. I got mine from a German eBay supplier for around £175, delivered. (Called 911teile, should you want to contact them.) This was less than a third of the OPC price. Yes, less than a third. I did type that right.

Keep us posted with the result.


Oli.
 


Bad news chaps, its the waterpump thats failed [:mad:]
Still at least it hasn't blown the head gasket, and the belts were due in approx 5000 miles anyway [8|]

Howard
 
I feel the best part of a thousand pounds about to drift its way in the direction of a garage here [:(]

ouch

Mas
 
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