OVERHEATING DISCO

generaldogsbody · Aug 26, 2016

My 3.9 v8 disco has cooling problem,i knew i shouldn't have bought it.Water pump was goosed,fitted a new one also changed the thermostat.Engine runs fine,it only seems to overheat when standing still in traffic.I did notice the temp needle sits at halve way but seems to go up a bit then back down to normal.Someone tell me what i wanna hear,that it's not a head problem.

discool · Aug 26, 2016

Seems that there maybe an issue with the viscous fan in that the viscous coupling is faulty, so without the flow of air through the radiator when traffic the fan isn't carrying on the cooling of the rad as it should, so the engine starts to overheat when standing still.

Do you have AC fans in front of the radiator? They will or should switch on to prevent overheating distroying your engine, but better never to get to that high temperatures in the first place.
Much better to check the viscous coupling before you have a major engine issue far worse that a failing head gasket/s.

The gauge needle should stay at arround 1mm above the base of the thermometer symbol whatever and where ever, no rising of falling.

generaldogsbody · Aug 26, 2016

no its not got electric fans,Now you mention it the viscous fan,it doesn't turn free.

generaldogsbody · Aug 26, 2016

discool said:
Seems that there maybe an issue with the viscous fan in that the viscous coupling is faulty, so without the flow of air through the radiator when traffic the fan isn't carrying on the cooling of the rad as it should, so the engine starts to overheat when standing still.

Do you have AC fans in front of the radiator? They will or should switch on to prevent overheating distroying your engine, but better never to get to that high temperatures in the first place.
Much better to check the viscous coupling before you have a major engine issue far worse that a failing head gasket/s.

The gauge needle should stay at arround 1mm above the base of the thermometer symbol whatever and where ever, no rising of falling.

Am going to flush the system out,and fit a kenlow fan.

The Mad Hat Man · Aug 26, 2016

use air con fans

discool · Aug 27, 2016

generaldogsbody said:
no its not got electric fans,Now you mention it the viscous fan,it doesn't turn free.

If the viscous fan is permantly locked-up so hard to turn round then that won't be the issue for 'not cooling' the rad its when they don't lock and spin is a problem. So start looking else where, iffy blocked radiator for instance.
Again don't let the engine get so hot that it boils over.

generaldogsbody · Aug 27, 2016

Should i fit an electric fan,or do you not recomend them.

discool · Aug 28, 2016

generaldogsbody said:
Should i fit an electric fan,or do you not recomend them.

There will be no additional benefits with replacing a disco V8s viscous fan with an electric fan.
The V8 engine needs all the cooling it can get so stay with with the viscous fan.

generaldogsbody · Aug 28, 2016

discool said:
There will be no additional benefits with replacing a disco V8s viscous fan with an electric fan.
The V8 engine needs all the cooling it can get so stay with with the viscous fan.

Will do,just bought some rad flush,going to take the rad off and flush it propper.

OVERHEATING DISCO

generaldogsbody

Active Member

discool

Well-Known Member

generaldogsbody

Active Member

generaldogsbody

Active Member

The Mad Hat Man

Well-Known Member

discool

Well-Known Member

generaldogsbody

Active Member

discool

Well-Known Member

generaldogsbody

Active Member

Similar threads