can some please help me..........my rpm's go up and down from 1000 to 3000 and i have only cold air blowint out of the heater,and the car also overheats........hmmmmm!

 

Check your idle air control valve and also your thermostat. Check coolant level inside radiator.

 

Either you are out of coolant...or your thermostat is bad.

My Prelude idled fine when it is cold and then after a minute...the RPMS jumped up and down in a cylical rythym. My coolant froze. It did the same exact thing when I drained my coolant without filling it back up.

Based on your symptoms....you are out of coolant or your coolant is frozen.

 

cool man tks,i checked the coolant and it was low......now the car runs perfect!

 

AWESOME!!!

Glad I could help