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3l diesel . hilux .pressure in radiator

Water hoses pressurise when radiator cap is screwed closed . isthere an air lock in engine that produces problems when coolant is replaced

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Yeah they don't take well to coolant change, theres all these air pockets around the engine. The thermostat needs hot coolant to open it, not a hot air pocket. I guess rechanging the coolant is putting coolant into the radiator and pouring it into the upper exit hose on the engine as well to minimise air pockets. The coolant temp sensor is only telling you how hot the coolant is, not how hot the engine is, no coolant means no temp reading or halfway temperature reading.

Posted on Apr 15, 2017

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Bleed any air out by loosening off the highest hose ( heater hose )
run with the heater open (on) to move any air out of the heater core
normally not problem with toyota but worth the check first

it could be a head gasket or cracked head
have a compression test done to determine the problem

Posted on Jan 02, 2017

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1 Answer

Fill up water radiator


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Could be several things - you will need to figure out if the cooling system is working or if the engine is producing extra heat such as with a restricted exhaust.
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Engine overheating i have replaced the radiator has plenty of water


replace thermostat.then bleed coolant system, this is how you do it.fill the cooling coolant system with 50 / 50 dexcool and water to raise boiling point,straight water will evaporate boil away cause engine to overheat catch fire thats why you need 50 / 50 mixture antifreeze and water.to bleed coolant system first fill coolant system until coolant stay at the full cold mark on the the coolant overflow jug,then you start engine allow it to idle,place the heater and ac control in any ac setting except max and the temperature control to the highest setting,run engine until lower hose to water pump is hot. with the engine hot run the engine speed up to 3000 rpm and allow it return to idle, repeat this 5 times. slowly open the bleed valve on the thermostat housing or look for bleed valve at the water pump heater hose.open bleed valve for 15 seconds to expel any trapped air.then top off the coolant as necessary,and when top radiator hose hot thermostat open up.keep adding cooling to overflow until coolant level stop at full cold mark dont over fill coolant.if engine seem like overheating while looking at cooling gauge turn off engine wait a while until cool off add more coolant until coolant level stay stable and dont drop any.when open radiator overflow cap use large rag over the radiator cap to keep from getting scald open radiator cap a little at a time but dont open radiator cap until engine cool down first.replace the radiator overflow cap, thermostat,and engine coolant temperature sensor and check the cooling fans fuses and relays see what happens.

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2 Answers

Water doesn't seem to be running around the system and is getting overheated. From the water bottle the hose to the engine is cold but the hose from the engine is hot as tho there is an airlock. is this...


there are a few possibilities .. first a bad thermostat is likely if the hose attached there isnt getting hot ... if the thermostat has been changed recently then make sure its in the correct way .. the spring or thermal sensor goes toward the engine .. the flipper valve goes toward the radiator .. make sure its not blocked by the gasket .. another possibility is a bad water pump .. an internally collapsed radiator hose is also possible ... make sure the cooling fan is turning on and actually moving air when the radiator gets hot ... you dont need the fan while moving but while idling the radiator will overheat if its not working .. you also have to check the pressure cap .. if it doesn't built pressure then the coolant or water will boil before the fan turns on .. when the engine is hot the radiator hoses should be hard from the pressure .. ... your problem sounds most likely a bad thermostat ..

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1 Answer

1999 alero changed thermstat and the car will intermitantly overheat there seems to be no pattern.


BLEED AIR OUT COOLANT SYSTEM.WAIT UNTIL ENGINE COOL DOWN.REMOVE COOLANT OVER FLOW PRESSURE CAP.IF YOU HAVE 3.1 OR 3.4 ENGINE OPEN AIR BLEED SCREW ON WATER PUMP BYPASS HOSE.OPEN BLEED SCREW.WATCH COOLANT IN OVER FLOW AS YOU OPEN BLEED SCREW COOLANT WILL DROP IN OVER FLOW JUG. AS IT DROPS CLOSE BLEED SCREW ADD MORE COOLANT IN OVER FLOW JUG DO THIS UNTIL COOLANT LEVEL STAY AT COLD FULL MARK.WHEN DONE TIGHTEN BLEED SCREW DONT OVER TIGHTEN IT OR IT WILL STRIP OUT BREAK.CRANK CAR UP UNTIL THERMOSTAT OPEN THAT WHEN TOP RADIATOR HOSE GET HOT.WATCH COOLANT GAUGE,IF ENGINE TEMPERATURE RISES TURN OFF ENGINE WAIT UNTIL COOL.REMOVE RADIATOR PRESSURE CAP USING A RAG TO KEEP FROM GETTING HANDS SCALED.ADD MORE COOLANT IF NEEDED WHEN ENGINE COOLANT STOP DROPPING IN OVER FLOW JUG AND ENGINE DONT OVER HEAT AIR IS OUT OF COOLANT SYSTEM.

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My Toyota Hiace high roof with 3L Diesel Engine heats up. This was after the cylinder head was skimmed and had new valves replaced. Please help me. How can I stop this heating up? Cannon


Your thermostat may be staying closed, if the top coolant hose becomes hot after the engine running for a while, then thermostat is opening ok. Next check to see if the bottom hose going to the rad is getting warm. If its staying cold then you may have a problem with the water pump not circulating the water around the cooling system. If thats ok check the rad cap is sealing ok. when the engine gets up to normal engine temperture remove the reservoir top filling cap which has a rubber pipe going to the thermostat housing. with the engine running there should be no water coming down the pipe and exiting the filler cap. If there is it could be the rad cap not holding pressure which it would need to be replaced or the head gasket is leaking and pressurising the coolant system.. hope this helps you..

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1 Answer

Was waiting at shops for my wife with my engine running for about 10 or 15 mins suddenly there was brown water coming from under my car i thought my radiator had gone i managed to get home and topped up my...


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1 Answer

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