MY1995 Classic WRX. really hard to start- twice this has happened in last few days.. when i start the car the radiator fan comes on straight away.it fires very slowly and will only tick over, it cuts out when i rev it. until it warms up then its ok. check engine light comes on flashes code 21 coolant temp sensor, will i need another temp sensor do you think. just a note i dont have the plug together when the fan comes on, ....
Any help would be greatly appreciated.

 

i have been having trouble with my fans too, and have been told that if the coolant sensor is gone then it will have trouble on idle, i found that 1 of the 2 fuses on there own in the engine bay fuse box was blown too.
the fans will come on when the coolant sensor plug is off.
just a thought, was it slightly frozen and it thowed itself out, just check you have enough antifreeze in.
phil.

 

Thanks for the info Phil , it was damn cold this morning but last week it wasnt too bad when it played up. Ive put a wanted post for one, my second one this will be in the last 6 months, although the last one was 2nd hand.
Cheers Mate.

 

Yes, defo classic failed coolant temp sensor symptom (as the code checked out). Why not get a brand new one - think they're only about £30-odd.