Hilux Over Heating Pt 2

Submitted: Saturday, Mar 01, 2008 at 09:35
ThreadID: 55073 Views:1517 Replies:6 FollowUps:1
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Ok people, when i got home from work this morning i started the task of draing cooling system so i could check it tomorrow, when i went too drain it i noticed that the top tank was warm/hot and the bottom cool too touch? possible blockage in the rad? or not a good water flow else where? your thoughts please

Cheers Nigel
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Reply By: stefan P (Penrith NSW) - Saturday, Mar 01, 2008 at 10:16

Saturday, Mar 01, 2008 at 10:16
sounds like blocked radiator....get it rodded

cheers Stefan
AnswerID: 290206

Reply By: Martyn (WA) - Saturday, Mar 01, 2008 at 10:41

Saturday, Mar 01, 2008 at 10:41
You would expect the bottom to be cooler than the top this proves the radiator is doing it's job. But as mentioned above if the temperature is significantly different then you are probably looking at a blocked radiator. Chemical cleaning is one option, getting the core cleaned by a professional is another this includes removing the header tanks, on older radiators this can lead to problems in the future they never seem to seal as well second time round. Other option is a new or reconditioned rad. Would be interesting to see know how blocked it is, just enough it appears........
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AnswerID: 290211

Reply By: Member - Kiwi Kia - Saturday, Mar 01, 2008 at 11:14

Saturday, Mar 01, 2008 at 11:14
Do you know any one that may have an infrared temperature gun ? You just point it at the spot you want to know the temperature and get a digital readout. If you can get hold of one of these you can do a sweep up and down the radiator and see if some areas are warmer then others. This could indentify any blocked tubes. Saves pulling the radiator to bits and 'rodding' it if it's not needed. As has already been sugested are you 100% convinced that the viscous fan is working properly ? That would be my first bet.
AnswerID: 290217

Reply By: tuffygordon - Saturday, Mar 01, 2008 at 12:15

Saturday, Mar 01, 2008 at 12:15
Cheapest option is to remove the thermostat and test it.Put thermostat in boiling water and it should open up.
AnswerID: 290229

Reply By: Dave Thomson - Saturday, Mar 01, 2008 at 17:50

Saturday, Mar 01, 2008 at 17:50
Had an overheating prob' once with my Hilux cut a long story it turned out the clearance on the bottom tank is too small so had it extended {cost $100.00} and solved the problem after elimanating all the usuals , thermostat etc,
AnswerID: 290264

Reply By: nigilor6 - Saturday, Mar 01, 2008 at 18:03

Saturday, Mar 01, 2008 at 18:03
well i checked the thermostat and it says it opens at 88 degreebut when i boiled up the water it was closer to boiling point so hopefully it is just a dodgy thermostat, when i drove the car around to give it a flush without the thermostat in it the temp gauge stayed lower than normal so hopefully im on a winner here
AnswerID: 290268

Follow Up By: Neil & Lynne - Sunday, Mar 02, 2008 at 08:32

Sunday, Mar 02, 2008 at 08:32
It is difficult to accurately gauge the opening temperature by eye.

A good trick is to slip a feeler gauge leaf into the opening then hold the thermostat in the water as it heats up.

When it falls off note that temp.


FollowupID: 555675

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