Firstly the engine needs to be hot when being tested for exhaust emmissions and needs to be reved during the test. It could be the radiator fan isn't kicking in when it should.
There are a number of possibilities so you would need to try and recreate the conditions of the test to find out.
I take it you have checked the under bonnet levels for signs of loss?

 

Hi and a very warm welcome. Do you know if the cooling fan is kicking in at all. Under normal driving conditions the cooler air going through the rad whilst moving is normally enough to keep the engine cool. Whilst doing the MOT the car will be stationary so will not have air going through it. The fan will normally kick in when the temperature guage gets to around 2/3 to 3/4 of the way up to the hot setting. heck the cooling fan and get back to us. Kind regards Oily

 

Hi,

Thanks to both of your for replying !!

You will have to be gentle with me as I am not very mechanical minded HAHA !

I will check out the fan and look under the bonnet tonight (with a bit of help lol) and I will let you know.

Thank you very much

Flossy

 

Hi,

Just to let you both know I had a look at the car last night and the cooling fan doesn't work !!!

I have arranged to take it into the garage to get the fan fixed before it MOT, but he has no idea how much it will cost!

I have discovered another fault, the steering squeaks when I turn right hand corners ! Which I will have to get fixed ...

Poorly Car

Thank you anyway for your help !

Flossy

 

Thank you for getting back to us. Lets hope it's just a fuse or something simple. Fingers crossed for you