Hi. I bought my Celica around 3 months ago. It's a 1999 gen7 on a "v" plate and has done 90K miles.

All was well until a month ago when it suddenly started overheating with no warning signs.

The car has been to 2 mechanics now, the first could not fix it and the second is running out of ideas.

Here is a rundown of what has been done to it so for.

The car will drive for around 4 miles from cold before the temp gauge goes to max.

the first mechanic suspected a blown head gasket, so done a "sniff" test on it, this showed no problems. he then suspected a stuck thermostat, this was changed with a new part, car still overheats.

Car then went to second mechanic, he suspected a broken water pump, so he stripped it out and found no fault with it, he also double checked the thermostat was working correctly. He then suspected a blockage somewhere, so thought the most likely place would be the radiator, so this was changed for a new one. Still overheating!!

He then checked the entire system for any more blockages, he said there was a slight blockage in the heater matrix, so that was cleaned out. He then bled the system following the proper Toyota procedure. Still exactly the same!!

He then also suggested a failed head gasket, so done a compression test to look for signs of leakage, all cylinders have good compression.

The car will take around 20 mins to heat up from cold at idle, and the fans are working. there is no hot air from the heaters.

So at the moment the car is sitting with everyone out of ideas.

if anybody has any ideas of what could be wrong i would greatly appreciate it.