radiator woes
Submitted: Tuesday, Jan 01, 2008 at 20:59
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mikeyprop3
My NM Pajero is losing minute ammounts of water each day. I recently paid $190 for a local radiator specialist to pressure
test and flush/refill. I took it back after pouring 2 litres in within the week! Pressure tested again with no problems. They diagnosed an airlock that they said would settle down. 3 weeks later it has consumed another 2 litres. Driving me insane now!
My question is what do they exactly pressure
test?
Also I did not lose volume today but recovery bottle was overfull and radiator 1/4 empty. When I removed cap their was a nice vacuum noise. The extra in recovery bottle was blown back into radiator and this reached correct radiator level.
I'm just about to
check myself into amental hospital! Any advice GREATLY appreciated.
Reply By: David from Engine Saver Low Water Alarms - Tuesday, Jan 01, 2008 at 22:06
Tuesday, Jan 01, 2008 at 22:06
The majority of radiator caps have 2 seals, the main top seal & a small one way seal in the base, to allow recovery from the overflow tank.
Remove the radiator cap, immerse it in a bucket of water & run your finger under to bottom seal to remove any foreign matter which may prevent a complete seal.
Test the overflow hose by applying simple mouth vacuum to it.
Block with the tongue to seal and see if it holds vacuum
(Of course do this with full regard to wh&s procedures after consultation the appropriate materials date sheets for the type of coolant involved)
If you don't have a recovery problem, the system should be retested for small leaks.
They can be notoriously hard to find with a normal pressure
test.
AnswerID:
279283
Reply By: Member - Matt (Perth-WA) - Wednesday, Jan 02, 2008 at 10:07
Wednesday, Jan 02, 2008 at 10:07
Mike you didnt say if it is petrol or diesel...if petrol I would suggest getting it to a mechanic to do a HC
test on the coolant. This will
test for the presence of combustion bypass in the coolant from a blown head gasket or cracket head/block.
Have you looked for bubbles in the coolant as others have suggested...this a crude
check to see if your pressurisation problems are due to gasket/cracks. The combustion pressure gets into the coolant and overpressurises and fills the overflow tank.
If you have replaced the radiator cap, checked the recovery hoses and there is an air-gap in the tank I would suggest there isnt anything wrong with the recovery system. The recovery tank is ost likely filling due to the combustion pressures.
The HC
test takes five minutes and is very conclusive if you do suspect the gasket etc but if its diesel there will be no HC but there may be bubbles visible when running with the radiator cap off.
All the best
Matt.
AnswerID:
279314
Follow Up By: mikeyprop3 - Wednesday, Jan 02, 2008 at 18:08
Wednesday, Jan 02, 2008 at 18:08
It's diesel matt.
Just waiting for cool down after days work to look for bubbles.
It might be blowing bubbles from the bottom of the Swan River directly...
Thanks mate.
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