P38 oveheating

kermit_rr · Sep 16, 2023

Are you sure you're getting all the air out when you bleed it? Run until the needle is almost up to normal with the cap off (well before it starts to boil) then switch off and let it cool down, with the cap still off. See if the level drops at all

Datatek · Sep 16, 2023

Could well be an air lock, they can be difficult to bleed. Do you have a trickle of water coming out of the little bleed pipe at the top of the RAD into the expansion tank?
The fact that with the cabin blowers on and the blends set to hot suggests it's just lack of flow through the radiator. Is the RAD evenly hot all over? Is the aircon condensor so full of shyte that the airflow is restricted?

Wayne890 · Sep 16, 2023

Datatek said:
Could well be an air lock, they can be difficult to bleed. Do you have a trickle of water coming out of the little bleed pipe at the top of the RAD into the expansion tank?
The fact that with the cabin blowers on and the blends set to hot suggests it's just lack of flow through the radiator. Is the RAD evenly hot all over? Is the aircon condensor so full of shyte that the airflow is restricted?

Should I have a constant trickle of water in to the expansion tank?

Mark Piercy · Sep 16, 2023

Was the fan new when you replaced it?

Mark Piercy · Sep 16, 2023

Wayne890 said:
Should I have a constant trickle of water in to the expansion tank?

A little at least. The metal bladed waterpump return a little less to the tank than the plastic variant. What year is it?

brianp38dse · Sep 16, 2023

You say the viscose fan works, they all spin but does it roar like a tank if not its not locking up,
when you first start it it should be noisy they go quiet then noisy again at temp.

Wayne890 · Sep 16, 2023

Mark Piercy said:
Was the fan new when you replaced it?

Yes brand new fan

Wayne890 · Sep 16, 2023

Mark Piercy said:
A little at least. The metal bladed waterpump return a little less to the tank than the plastic variant. What year is it?

2001

Wayne890 · Sep 16, 2023

brianp38dse said:
You say the viscose fan works, they all spin but does it roar like a tank if not its not locking up,
when you first start it it should be noisy they go quiet then noisy again at temp.

Yep fan definitely works

Toyota Twonk · Sep 16, 2023

Drill a hole in the bottom of the radiator and fit a drain plug.
Can get the sludge out then.

Wayne890 · Sep 16, 2023

It’s a new radiator it came from my old car which never overheated.

marjon · Sep 16, 2023

Toyota Twonk said:
Drill a hole in the bottom of the radiator and fit a drain plug.
Can get the sludge out then.

Everybody needs to ignore this guys advice.

J

Datatek · Sep 16, 2023

Toyota Twonk said:
Drill a hole in the bottom of the radiator and fit a drain plug.
Can get the sludge out then.

It's a new RAD and they have a drain plug.

Datatek · Sep 16, 2023

Wayne890 said:
Yep fan definitely works

Do the rolled up newspaper test, new these days does not unfortunately mean good.

Wayne890 · Sep 16, 2023

Datatek said:
Do the rolled up newspaper test, new these days does not unfortunately mean good.

Please explain the rolled up news paper test

Toyota Twonk · Sep 16, 2023

Datatek said:
It's a new RAD and they have a drain plug.

Power it up from the bottom then with coolant forcing the air out through the heater matrix..

Datatek · Sep 16, 2023

Toyota Twonk said:
Power it up from the bottom then with coolant forcing the air out through the heater matrix..

Go back to your Toyota twonk you clearly know sweet FA about the P38.

Datatek · Sep 16, 2023

Wayne890 said:
Please explain the rolled up news paper test

Tightly rolled newspaper, engine up to temperature and idling, keeping hands clear, shove the end of the newspaper into the fan blades, if it stops, it's no good.

marjon · Sep 16, 2023

Toyota Twonk said:
Power it up from the bottom then with coolant forcing the air out through the heater matrix..

@Wayne890 please ignore this idiot and follow what Data or somebody who knows is about to explain

If it’s up to temp and the viscous fan kicks in it should rip a rolled up newspaper to shreds if you poke it in.

If it’s up to temp and you end up with a newspaper and a stalled fan then it isn’t working.

J

Wayne890 · Sep 16, 2023

Datatek said:
Tightly rolled newspaper, engine up to temperature and idling, keeping hands clear, shove the end of the newspaper into the fan blades, if it stops, it's no good.

Thanks I will give that a go. Do the two small fans in front of the rad have anything to do with cooling the engine or are they just for the heating system. Is there a way of testing them? I’ve never seen them on

P38 oveheating

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