n reg Renault Laguna, running hot , can any one help? no match in the petrol tank jokes please so boring! .?

compression check will tell you that cylinder is sealing properly & from what you say dose not sound like head gasket.Renault electrics are quite tempremental,before you change anything get an earth lead from the battery straight to the engine as this is often degrades giving high resistence and temp sensor goes barking mad.If that does not work then look at changing temp sensor then thermostate.

Compression test is easy, as is changing the thermostat.

Worth draining all the coolant and try again with new anti-freeze.

Rule out the easy stuff first. Head gasket may show as bubbles in the reservoir !

Sound like the electric fan is not switching on or the radiator is blocked.

Try flushing the cooling system with Rad flush, remember to replace the anti freeze though.

I`m a car mecanics since 1980,fron brazil south america.meny of the answers that u have is trusth, but the best thing to do .take the car to your mecanics. because this can came to be very siriosly, be carfully. may guive you an espencive solution if it takes to long.see you.

these cars are prone to head-gasket failier,

having an alloy head, there usually ok until the block heats up causing the head to expand and over heat?

hope this helps?

ty.

The electric couling fan or sensor is faulty

could be thermostate problems

replace this first run vehicle up to temperature & check the electric fan is working correctly

maybe its the fan not enought air going throught the engine get it checked out asap

it could be your themostack and a compression test would not solve the problem

bad sensor or thermastat