Upper Radiator Hose --- Swells then Pops Off

[Dave M]

IF you have ruled out most 'obvious' cooling system related items, then, and only then, should you consider the big air pumps we call cylinders . What I'm getting at is the possibilty that exhaust gasses are breaching a head/headgasket, entering the cooling system and causing the issues. Now, I definitely don't want to cause a stir, but if you can't figure it out with general cooing system 'stuff, then begin with a compression test, leakdown test and/or one of those fancy exhaust gas tester thingies (I've never used one of the thingies). I had a very similar thing occur with my M50. No blown hoses, just a ton of residual pressure built up, which would still be there after a night of sitting. It ended up being a cracked head.

I should have started by asking whether you're 'using' any coolant or have any form of mixing going on in the crancase, cooling system. If you don't use a single drop or have any mixing, then its much less likely a head or gasket is shot.

Sorry if I put the fear in you. It seems as though you're at the end of your rope. Keep us posted,

Dave M

[Evan]

I checked for coolant in the oil and there I was relieved to NOT find any....

I'm checking the PCV system again

[Dave M]

I checked for coolant in the oil and there I was relieved to NOT find any....

I'm checking the PCV system again

You don't need to have coolant in the oil, it can enter the cylinder and burn. I assume you don't 'use' any coolant either? Not sure if you get exhaust gases breaching a head without the burning or mixing of anything.

Good luck finding a cheap solution. All the best,

Dave

[632 Regal]

M60's rarely have bad headgaskets, If I was you id chect the common things first such as thermostat, fan, aux fan and waterpump...dont forget the radiator for blockage either internal on on the surface of the front from dust dirt buildup.

[Evan]

thanks, Jeff

the t-stat and water pump are new and working properly.. the radiator is a year old and is working properly with no obstructions and good flow from top to bottom

the car is driveable and has full power so i dont think there is any issue other than some restriction in the cooling system

ive also don the fan/shroud delete mentioned by boone.msi (removed the fan and shroud and changed to a lower temp t-stat and lower temp thermo fan switch)

both setups have the same problem with pressure building up and not being released through the expansion tank...

[632 Regal]

Ahhh details details....

ive also don the fan/shroud delete mentioned by boone.msi (removed the fan and shroud and changed to a lower temp t-stat and lower temp thermo fan switch)

try putting the main componants back and see if you have a problem, the clutch fan and shroud do 90% of all cooling no matter where the temp guage is at. The thermostat is probably fully open and flowing so fast it isnt cooling the system but also returning cool water to the temp sensor. There was at a time a reason for the fan and shroud. The cold cylinders in front will wear at a rapid rate without a controll in place.

[Evan]

I'm already tested it stock and had the same problem but I'm going to do it again.

I haven't been driving the car until i get all the issues straightened out.

Thanks for the good advice!

[Alexlind123]

Thats what she said.

[Evan]

I'm baffled... same symptom with stock setup

[Tiger]

What happens when you reinstall your original cap?

Where on upper hose does it pops off? The radiator? The radiator is supposed to have a nub to prevent the clamp from sliding off... maybe your nubb is broken off...