300tdi running hot

Wilddog4x4 · Aug 2, 2020

My 300tdi defender is running slightly hot, about a quarter before the red. It also gets to temperature very quickly, within a couple of miles. It never gets to the red but I definitely dont want to keep running it hot. Just looking for some ideas before I start digging into it properly. Thanks.

jamesmartin · Aug 2, 2020

feel the rad core all over see if it gets hot everywhere

Gmacz · Aug 2, 2020

Temp sensors are cheap to replace and give problems if the above is OK.

Wilddog4x4 · Aug 2, 2020

jamesmartin said:
feel the rad core all over see if it gets hot everywhere

Thanks I'll give that a go. Easier say than done with a full width intercooler though.

jamesmartin · Aug 2, 2020

Wilddog4x4 said:
Thanks I'll give that a go. Easier say than done with a full width intercooler though.

try the other side engine off obviously

Wilddog4x4 · Aug 2, 2020

jamesmartin said:
try the other side engine off obviously

I've got to change my power steering pump so I'll be taking the fan of then, should give me good access.

lynall · Aug 2, 2020

New fault/existing fault?
Last 300 I did that was getting hot quickly was head gasket.

Wilddog4x4 · Aug 2, 2020

lynall said:
New fault/existing fault?
Last 300 I did that was getting hot quickly was head gasket.

Hope not I've had the head off twice in the last year. It's been a issue for a while so dont think it's head related.

lynall · Aug 3, 2020

If its getting hot within a couple of miles I cannot see it being a rad issue, could still be head issue, ie cracked

Have you,
Removed and checked the water pump? ie impellor tight on shaft
Removed and tested the stat?

Are you getting heat out of the heater?

Is it using coolant?

Is car genuine 300 or a retrofit? wondering is hoses etc correct?

My experience with pretty much all older land rover diesels is they take 3 to 5 miles minimum to get hot enough to open the stat.

Wilddog4x4 · Aug 3, 2020

lynall said:
If its getting hot within a couple of miles I cannot see it being a rad issue, could still be head issue, ie cracked

Have you,
Removed and checked the water pump? ie impellor tight on shaft
Removed and tested the stat?

Are you getting heat out of the heater?

Is it using coolant?

Is car genuine 300 or a retrofit? wondering is hoses etc correct?

My experience with pretty much all older land rover diesels is they take 3 to 5 miles minimum to get hot enough to open the stat.

Haven't checked the pump or thermostat yet so I'll definitely take a look. Hater is working fine, no coolant use, and it's a factory 300tdi.

Wilddog4x4 · Aug 3, 2020

Apologies for the bad quality photo, but that just came out the front of my radiator, looks like the fins have corroded. Not sure it will solve the getting up to temperature too quickly problem but replacing it should help with running cooler.

lynall · Aug 3, 2020

Maybe just maybe thats fooked

Dragonwalker · Aug 3, 2020

lynall said:
Maybe just maybe thats fooked

Dunt leak it's fine.

lynall · Aug 3, 2020

Dragonwalker said:
Dunt leak it's fine.

Tbf I have seen rads with no fins left at all, still doing their job.

Dragonwalker · Aug 3, 2020

lynall said:
Tbf I have seen rads with no fins left at all, still doing their job.

Might as well take it out and back flush it.

Wilddog4x4 · Aug 3, 2020

Anybody have any recommendations for a new radiator?

jamesmartin · Aug 3, 2020

it needs replacing whether its the total problem or not,

Wilddog4x4 · Aug 3, 2020

jamesmartin said:
it needs replacing whether its the total problem or not,

Yeah definitely needs replacing. Disintegrating just looking at It.

lynall · Aug 3, 2020

I have heard different stories on the plastic/alloy rads.
Personal experience with the all brass/copper ones, been on the car for several years now with zero issues.

300tdi running hot

Wilddog4x4

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jamesmartin

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Gmacz

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