172 overheating and the garage cant figure out why.

[Pittsy]

My 2003 172 overheated on a short drive last week and cooked off most of the coolant. The garage have had a look and they cant find the problem. They have changed the thermostat and the head gasket looks ok. Any help would be greatly appreciated.

 

[Mr R.]

Water pump ok?

 

[R-Sport.]

I saw a V6 up at 2 techs yesterday - was overheating,

every single blade on the pump had been sheared off. maybe that the reason!

 

[Pittsy]

I had a new water pump fitted when i had the belts changed a few months ago so hope its not that.

 

[marinemackay2003]

coolant temp sensor ok?

 

[WilkyWay]

Are the heaters working ok? All of the radiator hot?

 

[Pittsy]

Yea the climate control was working fine. Im not sure about the sensor but it did cook off most of the coolant and was bubbling when i opened the reservoir. Looked like there was a airlock aswell because some coolant flowed back into the reservoir when i opened it.

 

[Ol’ Tarby]

Expansion tank cap seal gone?

 

[cliffy858]

Mine was boiling up and chucking the water out. It turned out to be the the expansion tank cap.

 

[Pittsy]

Took it to a little renault specialist and it was the head gasket in the end. All done and running like a dream

 

[Tony Hunter]

And who was this Renault specialist then. Be good to know.

 

[Bluebeard]

Took it to a little renault specialist and it was the head gasket in the end. All done and running like a dream

In all my years on this forum, all the 172/182's I've had, I've only ever known one 172 blow a head gasket and that was after the guy drove it down the motorway with a cracked radiator.

Very uncommon.

 

[Dan@SJM]

I'm still yet to see a blown gasket.

 

[Pittsy]

The thermostat failed and the gasket went. Its had a reconditioned engine at some point before i bought it so they probably didn't do a very good job.

 

[MartinR]

Did you have the belts changed during the headgasket change?? Or just put back together??

As said its like spotting a unicorn as the gaskets don't go on these

 

[Pittsy]

Yea belts got changed aswell.