200tdi overheating

so the old girl overheats. its a disco 200tdi into a 90. (1986) the missus drives it to work everyday and does about 30min at 60 on a dual carriageway and it will start to overheat. not too sure how much or for how long as she doesn't seem to pay too much attention! but she does pull over to allow it to cool down. i stuck the viscous fan back on, flushed out the pipework till it ran clean, cleaned the mud out of the rad. apparentely it has made no difference at all.

i have a new thermostat ready to fit, my rad is looking a bit sorry for itself but not awful.

is there anything else it could be? i'm a bit stumped as it is when she is doing 60 odd which normally going that fast helps cooling. it seems fine around town. i towed by 1.5T boat the otherday for 40min at 50 with no overheating issues either.

help!?

thermostat made no difference, sorting a new to me radiator, any ideas after that?

Mate are you sure its actually overheating? (If its owt like my missis, she wouldnt even 'know' if the engines overheating without seeing a high reading on the gauge lol!)

Iv just cured the Exact same problem on mine. I too put a Disco 200tdi in me 90 and had a high temp reading (nearly in the red!)

It wasnt no where near over heating it just needed the correct 'Temp Sender' fitting to match the Defenders gauge!

I got mine from 'Steve Parkers' Unscrew your temp sender and determin if it has the 'fine' or 'course' thread as there are two types (Mine was the fine thread) cost me 12 quid inc post and has sorted the problem!

Hers the link Steve Parker Land Rover Spare Parts, Land Rover Accessories, Exhausts, Suspension

Hope this helps mate,

Scott

the previous owner did the conversion so i don't know what sender he uses. it has run well for ages, in the winter i even complained it never warmed up. when she got back last night the gauge was on 3/4 so i popped the bonnet and could hold onto both the top and bottom rad hoses. they were very hot, but i could hold them so i guess around 80 degrees c which correlates with the 3/4. i think i'm going to have to drive it as it only goes over temp when she does it so she may just be being stupid. i have a new rad on route so hopefully that will help. i will get a steve parker sensor also to be sure it is correct. thanks for your help. steve

steve bain said:

i popped the bonnet and could hold onto both the top and bottom rad hoses. they were very hot, but i could hold them so i guess around 80 degrees c which correlates with the 3/4.

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hot coolant going in - hot coolant coming out

guess what's not doing it's job properly

bloody obvious when you say that!! well hopefully the rad will help. the other is a bit of a state!

steve bain said:

the previous owner did the conversion so i don't know what sender he uses. it has run well for ages, in the winter i even complained it never warmed up. when she got back last night the gauge was on 3/4 so i popped the bonnet and could hold onto both the top and bottom rad hoses. they were very hot, but i could hold them so i guess around 80 degrees c which correlates with the 3/4. i think i'm going to have to drive it as it only goes over temp when she does it so she may just be being stupid. i have a new rad on route so hopefully that will help. i will get a steve parker sensor also to be sure it is correct. thanks for your help. steve

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Holding onto 80 degree c, must be a chef or blacksmith.

ssmn1234 said:

Holding onto 80 degree c, must be a chef or blacksmith.

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I can tell the temp of a coolant system right up to 95 degs by holding onto/touching the coolant pipes.

At 88° C, skin burn is almost instantaneous, at 78° C, it takes less than 0.5 of a second, so I reckon that touching would be the way to go, not holding.

Normally it smells if it overheats, but the best option is to get yoself a cheap IR thermometer. I always carry one in my motor. It is very useful for checking coolant temps in top & bottom hoses and checking for blockages in radiators. Also useful for checking effectiveness of air con and exhaust gas temps.

The Mad Hat Man said:

Normally it smells if it overheats, but the best option is to get yoself a cheap IR thermometer. I always carry one in my motor. It is very useful for checking coolant temps in top & bottom hoses and checking for blockages in radiators. Also useful for checking effectiveness of air con and exhaust gas temps.

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does it help with getting the correct temp when poaching eggs too?