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If the thermostat is working on the bench in a pot of hot water, then your radiator is probably blocked with scale from someone using tap water in the cooling system many years ago.

You could always check the impeller on the pump for corrosion too.

Edited by scotty nm35

Giving it some doesn't seem to cause any issues as long as its flat.

I don't think its just a gauge issue as it will actually boil over into the overflow container if you stop when its overheated.

Something is causing it to cook...

Could the thermostat be stuffed in such as way as to cause it to begin to close when the car is on an incline?

There are lots of things that can make a car overheat such as faulty thermostat, leaking frost plugs, wrong timing, running too lean, brakes binding, belts slipping but 90% of the time its the radiator. Just get yours opened up and cleaned out or replaced and the rest of the block flushed. Odds are that will fix it and if it doesn't you can start looking for more esoteric causes.

Any hints on the bleeding process?

Where is the bleed valve for starters :D

see attached PDF....snapshot there as well of the air relief plug

If you do have an airlock the process takes an hour or so.

Put the car on a level surface then get it hot....loosen bleed valve slowly without removing it.....if you hear air seeping then you have found your problem....if it just squirts radiator fluid good chance you don't have an airlock.

co.pdf

post-37023-1262735373_thumb.jpg

  • 1 month later...

Just to close this one out...

The radiator was about 60% blocked.

The internal tubing is made up of very thin flat pipes that wouldn't take much buildup to block them off.

Only time will tell, but I think this is going to be the cause of the problem.

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