Celice Vvti Overheating Problem - Tried Everything!

[Damien123]

Any you Toyota genuises have any ideas for this one:

Gen 7, 140hp Celica. Have an overheating problem and this is what i've tried so far:

New thermostat

New Radiator

New Water pump

New head gasket

I know :(! They seemed to have helped the problem - the car doesn't overheat on the guage anymore, guage sits half way which is good (occasionally lifts 1 notch for about a min when driving then returns to half) but when you open the bonnet you can actually hear the water boiling in the expansion bottle. If you release the pressure in the expansion bottle the water flies out of it

It's like there's a big air lock or something. But i've bled it at the bottle a million times and still the same.

More info:

Water coming out of one side of the radiator is cool and the other side's roasting, weird. The side which is roasting the fan is not on. Fan on pretty much constantly on the other side.

Car heater wasn't working for a bit seemed a bit random. would blow mostly cold then hot for a bit. Water going into the heater is roasting water coming out (other pipe) is cold! but the heating seems to work. I'm outta ideas. I just want to get it sorted!

Any bright spark out there any ideas!? :)

[KPARRIS-JONES]

Are you sure that it isn't a fault with the sensors?

The water going in would be far hotter because it had just circulated around the engine, the water going out is cold because the radiator is doing its job! ;)

Test the sensors for their resistance. I don't know exactly what reading you should get so hopefully someone else can tell you here. :)

[Bos]

Are you sure that it isn't a fault with the sensors?

The water going in would be far hotter because it had just circulated around the engine, the water going out is cold because the radiator is doing its job! ;)

Test the sensors for their resistance. I don't know exactly what reading you should get so hopefully someone else can tell you here. :)

Have you checked the condition of the hoses?

If they are 'soft' then they could compress when water goes through them. This would restrict the flow and could cause overheating.

[Jamesbelfast]

Are you sure that it isn't a fault with the sensors?

The water going in would be far hotter because it had just circulated around the engine, the water going out is cold because the radiator is doing its job! ;)

Test the sensors for their resistance. I don't know exactly what reading you should get so hopefully someone else can tell you here. :)

Have you checked the condition of the hoses?

If they are 'soft' then they could compress when water goes through them. This would restrict the flow and could cause overheating.

LMFLO :ffs: If the hoses were soft they will expand when hot water under pressure goes through them. Think what happens to a kids balloon when you increase the pressure inside.

[KPARRIS-JONES]

Are you sure that it isn't a fault with the sensors?

The water going in would be far hotter because it had just circulated around the engine, the water going out is cold because the radiator is doing its job! ;)

Test the sensors for their resistance. I don't know exactly what reading you should get so hopefully someone else can tell you here. :)

Have you checked the condition of the hoses?

If they are 'soft' then they could compress when water goes through them. This would restrict the flow and could cause overheating.

LMFLO :ffs: If the hoses were soft they will expand when hot water under pressure goes through them. Think what happens to a kids balloon when you increase the pressure inside.

It would still have the end result, with not enough pressure so the flow isn't quick enough. :)

[Jamesbelfast]

Intermittent heat from the heater usually denotes an air lock or gassing problem. Could the head gasket have gone again or possible cracked cylinder head. A chemical test of the coolant would show if it was being comtaminated by combustion gases.

One other possibility could be a blocked radiator.:)

[KPARRIS-JONES]

Intermittent heat from the heater usually denotes an air lock or gassing problem. Could the head gasket have gone again or possible cracked cylinder head. A chemical test of the coolant would show if it was being comtaminated by combustion gases.

One other possibility could be a blocked radiator.:)

He already replaced the radiator. :P

[Jamesbelfast]

Are you sure that it isn't a fault with the sensors?

The water going in would be far hotter because it had just circulated around the engine, the water going out is cold because the radiator is doing its job! ;)

Test the sensors for their resistance. I don't know exactly what reading you should get so hopefully someone else can tell you here. :)

Have you checked the condition of the hoses?

If they are 'soft' then they could compress when water goes through them. This would restrict the flow and could cause overheating.

LMFLO :ffs: If the hoses were soft they will expand when hot water under pressure goes through them. Think what happens to a kids balloon when you increase the pressure inside.

It would still have the end result, with not enough pressure so the flow isn't quick enough. :)

Pressure and flow ain't the same thing are are entirely different especially in a closed coolant system.:)

[KPARRIS-JONES]

Are you sure that it isn't a fault with the sensors?

The water going in would be far hotter because it had just circulated around the engine, the water going out is cold because the radiator is doing its job! ;)

Test the sensors for their resistance. I don't know exactly what reading you should get so hopefully someone else can tell you here. :)

Have you checked the condition of the hoses?

If they are 'soft' then they could compress when water goes through them. This would restrict the flow and could cause overheating.

LMFLO :ffs: If the hoses were soft they will expand when hot water under pressure goes through them. Think what happens to a kids balloon when you increase the pressure inside.

It would still have the end result, with not enough pressure so the flow isn't quick enough. :)

Pressure and flow ain't the same thing are are entirely different especially in a closed coolant system.:)

What I mean, is if the hoses contract, then it restricts flow. If they expand, then it probably wont be getting around fast enough.

[Bos]

Are you sure that it isn't a fault with the sensors?

The water going in would be far hotter because it had just circulated around the engine, the water going out is cold because the radiator is doing its job! ;)

Test the sensors for their resistance. I don't know exactly what reading you should get so hopefully someone else can tell you here. :)

Have you checked the condition of the hoses?

If they are 'soft' then they could compress when water goes through them. This would restrict the flow and could cause overheating.

LMFLO :ffs: If the hoses were soft they will expand when hot water under pressure goes through them. Think what happens to a kids balloon when you increase the pressure inside.

If the pump is pulling in the coolant and the pressure from the pump is too great then the hose could partially collapse giving a smaller bore and hence restrict the flow in the system.