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Neil26111
Hi guys new here and need help/advice. I have a 53 reg zetec s tdci 130 that started to overheat a few weeks ago. I thought the water pump had gone again but it was only changed 2 months ago, anyway I checked water level and that was bang on not used a drop in the 2 months since I changed the pump, checked pump and that's working so I changed the stat but that didn't help. If I leave it running on the drive it gets to half way on the temp gauge in about 10 mins and just sits there, as soon as I drive it the temp gauge shoots off into the red and I lose power, I am not getting any warm air through the blowers in the car either, when it overheats the fan cuts in and the stat is open as the pipe after the stat is warm but the header tank only gets Luke warm. I have found a water pipe coming out the bulk head just where the cat is and that's stone cold so I'm wondering if the heater matrix is blocked? Also the rad doesn't get warm but I have checked flow through it and that's ok as well, one person has said the head gaskets gone but there are no signs, no water in oil or oil in water. Also if the head gasket had gone I would have thought I would still get warm air through the vents in the car?
Has anyone got any ideas as what to do next? I have just got some wynns coolant system flush to see if that clears anything if not I'm stuck.
Please help
Thanks
mick85
I say ur heater matrix is blocked ur spot on now i say at some stage someone put rad weld in
Neil26111
Trying it today so hopefully will sort it. If not how hard are they to change?
Will let you know what happens
Thanks
FOCA

The heater matrix is a pain to change

 

1st thing you should know is the temprature sensor for the ECU and the temp gauge is on the metal of the head, it reads the head temp even if the water runs dry

 

2nd thing is that if the heater matrix gets blocked the water can still circulate round the system when the main thermostat opens - it is an alternative route  

 

Double check the system is bled and has no air locks, it is difficult to bleed and the correct procedure must be used (i forget what it is exactly but its a lot of hassle ) 

 

Did you fit a brand new waterpump? was the gasket between the pump and plock put in the right way? the pump is driven from a pully off the camshaft through the power steering pump - were the splines ok on that?

 

As a temporary measure - take the main thermostat out and run the car, see what happens

 

the main thermostat is at the end of the head, near the battery, its housing  is held on by 3 bolts,there is another, smaller  thermostat for the oil cooler coming off the waterpump housing  

Neil26111
I took the main stat out to run it without it in but water just ran out quickly, I have tested that stat and it's fine. If there was an air lock surely the problem would have appeared before and not after 2 months and a thousand miles?
I did fit a brand new water pump but the gasket to the head was torn so I used some gasket seal as well. There are no leaks around it.
I have removed the bleed screw on the pump and water rises out of that so presume it's working, I haven't check the shaft/blades yet as it's a pain to remove them but that might be where to go next?
FOCA

I took the main stat out to run it without it in but water just ran out quickly, I have tested that stat and it's fine. If there was an air lock surely the problem would have appeared before and not after 2 months and a thousand miles?
I did fit a brand new water pump but the gasket to the head was torn so I used some gasket seal as well. There are no leaks around it.
I have removed the bleed screw on the pump and water rises out of that so presume it's working, I haven't check the shaft/blades yet as it's a pain to remove them but that might be where to go next?

 

 

it depends - if its lower than the resovoir it may syphon out even if the pump is kaput

 

An option is to leave the waterpump on, with its shaft/ blades mounted, and just remove the plastic side cover  

 

Alternatively, you could somehow check that the water is circulating,   



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