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Matt
Matt, Mechanical Engineer
Category: UK Car
Satisfied Customers: 21863
Experience:  BEng hons Mech engineering, in auto industry 22 years
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3l engine overheating problems, yes i have check and change

Customer Question

3l engine overheating problems
JA: Have you checked the coolant? Have you checked for a leak in the cooling system?
Customer: yes i have check and change water pump head gasket clean radiator but still overheating
JA: What is the make/model/year of your car?
Customer: toyota hiace bus lh(###) ###-####
JA: What year is your Toyota?
Customer: 1995
JA: Are you fixing your vehicle yourself? What have you tried so far?
Customer: i have cleaned the radiator changes the water pump themostat , headgasket
JA: Anything else you want the mechanic to know before I connect you?
Customer: no
Submitted: 4 months ago.
Category: UK Car
Expert:  Matt replied 4 months ago.

hello

as you have replaced a lot of items, then it may be worth checking that the temperature sensor is reading correctly as a faulty gauge sensor may be misleading you.

so ideally use a thermal probe to confirm it really is overheating

if it is getting hot and you're not losing water / coolant then its possible the belt is slipping so its worth replacing its especially if the rubber ribs are cracked or it looks shiny on flat side of the belt - while its off check that the tensioner and other pulleys all spin freely the exception to this is the AC pump ( if fitted)

I'd also suggest ensuring that you've got all the air out of the system as this sort of episode can leave pockets of air trapped and prevent the coolant from circulating properly.

So check that the small hoses that run from the top of the engine and radiator that run back to the header / expansion tank are free flowing and not blocked

If these are OK then remove the tank pressure cap and run the engine from cold with the heater set to full hot

As the engine starts to warm, squeeze the large hoses running to the radiator to help displace any air - all the time keeping an eye on the level in the header tank, making sure it doesn't drop below the minimum and open any bleed screws built into the top cooling hoses - closing them off as soon as they start to gush water

Once the engine is up to temperature the tank should be quite full. Switch the engine off and leave it to cool

Then top up to the mark once its all cold and replace the cap