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Discussion Starter #1
Just had heater matrix changed but now the temp gauge doesn't rise at all when driving but will rise just below 70 when stood idling for a decent amount of time the hot air coming from the heater is Luke warm, when I check the water the level it's ok but the pipes seem to have too much pressure in them so I'm having to release the pressure by un screwing the cap as I don't want a blown pipe etc. No air lock according to garage, can anyone help there must be a reason why temp isn't rising, the garage just said it was ok but I think different.
 

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Sounds like thermostat is stuck open although can't see why the matrix change would have caused that but maybe just coincidence. It's normal for hoses to pressurise and they won't blow as your pressure cap will release at 13psi approx.
 

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Maybe the Matrix change dislodged some crud which has now caught in the thermostat holding it open My temp gauge only rises to 70 at the moment but it does blow toasty hot air only time I have seen it at 90 with the fan on was in a traffic jam in the summer
 

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Discussion Starter #4
Ok thanks for that I'll look into it, I bought the van with the matrix been by passed so not really sure why previous owner dI'd this as he was very vague on the information. I will get the stat looked at and if I have no joy I'll be asking for help again lol, cheers guy's.
 

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the stat sets the engine max temp,the rad is there to dump excess heat,the heater matrix runs off the pumped water circulating the engine,so runs at whatever temp the stat is allowing to make the engine run at...
if you don't get the engine getting warm enough it probably needs a new stat(it might have one too cool fitted? ie 74 degrees?)
neil
 

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Discussion Starter #8
When I replaced the stat in my van I soon found out it didn't have one in in the first place which I can now make sense of poor mpg and engine not getting up to temp, so the matrix had been by passed and the stat had been taken out! Previous owner obviously had overheating problems? But now I've sorted them issue's I've run it fir a few day's I've noticed the water level go down slightly and make the light come on the dash, I've put a new cap on header tank and what's happening now is the cap is releasing pressure and I'm presuming that's where the waters going too, could this be an early sign of head gasket going or could there be something a bit more simple? Yet again garage saying just run it and they think it's fine but I know it just isn't quite right. I know bits about engine's but not loads.
 

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I have an e7 which leaks water out of the cap and brings the light on about 1 or 2 times a week. it takes very little water to top it up so I have just let it go to see what develops. funny thing is this bus does about 500 miles a week and has been running like this for months and it has not got any worse. Ive also replaced the cap, thermostat and the 2 radiators, temp when running is normal but it still builds a little pressure.
 

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Discussion Starter #11
I might just wait and see what happens, I've only run it a few day's, so see what happens I just didn't want to cause more damage somewhere. Thanks
 

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Diesels DO NOT mix oil and water when head gasket goes they pressurise the water system AND the heater goes cold.

My guess is the engine was already overheated and burst the heater matrix or vice versa

Its irrelevant though as if its pressurising then its most likely needing a head gasket if you don't sort it out the heater will burst again.

You need a new garage :)
 

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I NEVER skim heads as I don't believe it is necessary but some always skim heads if it has got hot enough to need a skim then its probably best to replace as it may also be weakened enough to crack soon.

I just prepare by hand with emery and a flat face but im old school
 

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Diesels DO NOT mix oil and water when head gasket goes they pressurise the water system AND the heater goes cold
Certainly the old pushrod Peugeot diesels would. As did Perkins, Vauxhall, Oldsmobile, Ford, and plenty of truck diesels.
If a gasket fails between a water gallery and either the crankcase or a cylinder then water can enter the crankcase.

Roger.
 
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