mydisco1

mydisco1

Member
Hi Guys,
My three year old 200tdi disco into my 90 conversion is getting bloody hot! Well the engine and top hose is!
Steve Parker sender for conversion checked by replacement.
Stat checked by replacement.
Lekky fan comes on when Kenlow sensor in top hose tells it to, i have wired it to a light to show me when it comes on in cab, fan does a great blo job, lol But their is no hot water in the radiator to cool so fan runs forever!
Freezing rad core, Rad re-cored at time of conversion, bottom hose freezing, expansion tank same, no bubbles when run until quite warm in the expansion tank.
There is no air trapped in system.
What do you think guys? your thoughts would be much appreciated.

My theory is no circulation, ei Pump! someone (please tell me i am wrong) before i cook my head gasket!
 
Last edited:
which engine was it originally ?

are the engine and stat matched ?

borrow a ir thermometor and measure the temperature of the hoses ?

have you seen the waterpump out of the engine ? highly doubt you have broken that its a big lump of steel to break.

Maybe a blockage or airlock somewhere is plausable ? describe how you fill the system? - i do recall my rad being a **** to get the fluid to circulate into it even with the bleed cap out - think i took the top hose off and filled it that way first.

and as BB says stick the stat in a pot with a thermometor and check out when it actually opens.
 
blue beasty
I will be well ****ed off if the new stat is fkd, ill cook it for mi tea and see.

top drive
N/A taxi lump.
Got a Steve Parker one to match my gauge.
An ir thermometor wont measure Jack on rad core, bottom hose, and expansion tank, there's no heat to measure!
Yea i have seen it out when i changed it on my first Disco about 100k ago.
Always fill em through expansion tank slowly until it comes out of mi brass plug on top of rad, always done it this way.
And by the way i have owned one that the impellor came off, the previous owner used a cheap aftermarket part and ran on just water, their is antifreeze in my vehicles all year round as its a lubricant aswell!

Thanks for your input so far guys :(
 
You seem to have covered all the bases. Last thing I'd try is to run it without a thermostat. If the rad and bottom hose are still freezing, it points to the pump.
 
mydisco1 said:
Hi Guys,
My three year old 200tdi disco into my 90 conversion is getting bloody hot! Well the engine and top hose is!
Steve Parker sender for conversion checked by replacement.
Stat checked by replacement.
Lekky fan comes on when Kenlow sensor in top hose tells it to, i have wired it to a light to show me when it comes on in cab, fan does a great blo job, lol But their is no hot water in the radiator to cool so fan runs forever!
Freezing rad core, Rad re-cored at time of conversion, bottom hose freezing, expansion tank same, no bubbles when run until quite warm in the expansion tank.
There is no air trapped in system.
What do you think guys? your thoughts would be much appreciated.

My theory is no circulation, ei Pump! someone (please tell me i am wrong) before i cook my head gasket!
Click to expand...
Sounds like the pump is not either turning correctly to deliver the correct water pressure or it's even siezed not giving you circulation that's why your not experiencing air in the system
 
TazDevil said:
Sounds like the pump is not either turning correctly to deliver the correct water pressure or it's even siezed not giving you circulation that's why your not experiencing air in the system
Click to expand...
Daft question but the belt is in tacked I presume?
 
Got to be the stat then buddy, even though it's a new one they can still stick either shut or open but in this case sounds like it's shut and not opening on temp
 
Cant you check the pump? Pull a heater hose off or something and turn the engine over, surely water will fly out if its pumping.
 
After cooking an engine due to dodgy stay I no longer run a stat. Rather Freeze me nads off than run a stat ever again!
 
Does the heater work? It takes its water from before the thermostat (so that you can get heat while the engine is warming up). If heater works then the pump is working and the thermostat is stuck closed. If heater doesn't work then either the pump is duff or you have no water.
 
nobber
I am going to remove my coolant tomorrow, its a 50% mix with antifreeze and store it until its fixed.
That way i can add and undo bits with just water in just letting it go without having to keep catching my coolant.
IamRobbie
In a 1987 90 you need all the heat you can get, brrrrrrrrrrrrrrrr lol
 
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