Peugeot 206 2000 1.4
New water pump
New rad
High and low speed fan ok
flush x2
compression test ok
cooling system pressure test ok
around town under 50km/hr runs fine
over 70 km/hr over heats
with the engine hot and the rag cap remove idles fine rev the engine a bit and coolant bubble out the coolant tank
what is the problem and what is the fix
All the things in the video changed forgot to put new thermostat
Passed exhaust gas test
Only overheats over 3000 rpm
Can a head gasket fail only at high rpm
Are your fans wired correctly? Are they blowing air in the wrong direction?
Are all the radiator hoses in good shape? If not, try new hoses.
Have you ensured that there’s no air in the system?
fan are drawing air into the engine bay, rad hoses are good.
There are two bleed points both checked.
only over heats above 2500 rpm open road or town.
Bubbling typically indicates that there is air pockets in the system, when doing the flushes was the bleed procedure done proper? Since the fans turn on at high and low, I do not think it is thermostat or switch's, but I could be wrong. On a side note have you checked the heater core? In ford vans that I've worked on, those sometimes leak and cause problems with their cooling systems. And any codes pop up?
The thermostat is new
There are no leaks that I can find and the cooling system was pressure tested over night and it passed the exhaust gas test
It only bubble when rpm over 3000
Can a head gasket fail only at high rpm and would it still pass a exhaust gas test
Should be thermostat not star can you edit on this page
Never seen a head gasket only fail at high rpm. If it fails you'll know you know. Did the car pull up any codes? Have you checked any relay or senders? After rewatching the vid, I believe that the spilling coolant while hot happens because the cooling system is suppose to build and stay under pressure. That's why you never want to take off a rad cap while the engine is still hot less it explodes coolant everywhere. But since the car overheats idk what to tell ya. You replaced everything and followed the cars bleeding procedure. The last thing I would really check is the relay and sender as it could just be reading the wrong temp. Or malfunctioning. Car should hold some codes if it is overheating.
took the head off today and the head gasket is badly rotted, I am still surprised the there were no other symptoms.
ooo lets see a photo . I love engine teardowns
Damn, what made you tear the engine apart? Did a head gasket test show a positive result?
I did not personally take the head off the car is at the garage will try to get a photo.
The mechanic had run out of possible reasons the head gasket was all that was left and the was a small oil leak from the top front left of the engine between the head and block a sign the gasket is on the way out.
the sender was replaced, fan worked on both speeds so relays ok and there were no codes that I know of.