Hi im new to this. im just after a bit of advise as i have just got a 1998 ford mondeo estate. drove it home last night and was fine. started driving it today and noticed that the temperature gauge was going up to the letter A then cools down a bit then goes back up. Just need adise on what it could be. I'm hoping its nothing major :(

Could be q duff thermostat or blocked pipe, are the hoses and pipes equally hot in the engine bay...

Also change the expansion tank cap, its probably not holding the pressure.

sounds to me like a possible air-lock. might be worth seeing if it is,before buying a new thermostat & cap.

go with Bruce on this one, the cap is the cheapest fix, and one I should have remembered, a new cap is a few quid, a thermo and housing isnt!

the pipes are warm and even. drove it last night and started to get quiet warm in traffic as soon as i started driving and kept the revs below 2000rpm it started to cool right down to almost cold. as soon as i go above 2000rpm it starts getting warm again. im just hoping its not hg. thank u for the replies

have you not found the problem yet?

No still have not found the problem.

its showing the classic signs of a duff thermostat.

yep-either stat or air-lock. Id replace the stat anyway if it was mines

ok ill get it changed asap..

I have another question but don't know where to post it lol

Post it to the appropriate forum :p

so if its a mondeo question, post it in the mondeo section, if its a general question not specifically to the mondeo, the general Ford, or if its naff all to do with cars, the general chat :p