Car is running hot.

[dmaestro]

Ok, my car's temp meter goes all the way past the H and goes back down, a lot.  The car doesnt feel funny at all though.  I just changed the oil and put and new thermastat in.  I also put some more coolant in.  But it still goes up to the H and goes back down and goes back up and goes back down and so on and so forth.  Anyone know why this is?

Thanks,

Sounds like you still have air in the system. Some have luck with the burp hole. I find filling through the top hose, with it held up as a stand pipe works for me.

[chickenmanq]

I would guess air or something like that.  I know Hondas have to be driven on a hill to get all the antifreeze to go in.  Otherwise it'll trap air in the system.

[ca18guy]

How quickly is it rising and falling, it could be your sensor is going bad.

[drifterx]

mine does that too......
it shot up and then come back down... sometimes really quick and sometimes really slow...... sometimes i can get it to come back down when i shift fast... it usually comes down when i smack the dash board really hard....
but i know the gauge works cuz when it is hot, then it shows up and when it is cold it shows cold....
sometimes shutting off the car works.... and sometimes it doesnt

[yenpit]

id agree with importcargarage....bleed out the cooling system.

[HondakillaS14]

Alos might be the heater resevoir isn't topped off either. That was my problem when my car did the same thing..... brought it to Nissan and flushed the system....problem fixed

[bing]

mine was doing that until today, turns out my rear caliper was dragging and causing a mess with my e-brake and every thing, done now, good now

[drifterx]

what si my problem u think?