M35 Overheating

[zei20l]

if you give it a hard time does it overheat also??

if it doesnt, look into the gauge itself

[scotty nm35]

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 January 5, 2010 by scotty nm35

[Cephas]

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?

[_Ryan_]

Have you had your radiator cleaned out yet?

In my experience, giving the car a thrash on the flat is nothing to temps compared to driving up hills, Might be an airflow thing?

[Jetwreck]

Have you tried bleeding the cooling system? Using the bleed valve? Airlocks are a pain to get out in these things

[KiwiRS4T]

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.

[Cephas]

Any hints on the bleeding process?

Where is the bleed valve for starters

[Jetwreck]

Any hints on the bleeding process?

Where is the bleed valve for starters

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

[Cephas]

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.