kput

Title is at states. Car blows cold unless the rpm's are up. When in idle it blows cold.

I filled the coolant and haven't seen any leaks.

What could it be?
Got about 60k miles now..

petrock

Probably the heater core. When it blows cold, where is the needle in the temp gauge? When it blows hot, where is the needle in the temp gauge?

I don’t know where the heater core is exactly on your ride, but look in the engine bay for two thick black hoses going into the firewall. When the motor is at operating temps, and you have the heater on full blast they both should be warm/hot. If one is warm/hot and the other is cold then the heater core is clogged/blocked. If both are cold then the inlet hose is clogged/blocked somewhere between the firewall and water pump.

Good luck...

torybella

Probably outside temparature is too cold and maybe your idle needs to be increased.

Lem-06

I cant imagine the reason is simply its too cold outside, once the engine is up to temp no reason the outside temp should cool the hoses going to heater core that much.

im leaning towards petrock with this one

Norm Peterson

Possible stuck (open) thermostat.


Might want to put a scan tool on it that can read coolant temperature.




Norm

Nuke

I'm still in the low coolant bandwagon despite the OP saying he filled it. I suspect a pocket of air that needs to be "burped". The fact that the outlet air changes temp with RPM seems to make the other suggestions not probable.

kput

I'm checking the air pocket next chance I get. That's my first step.
Then I'll go to checking heater core and the other stuff.

vixr

I'm with Nuke...sounds like a low RPM steam pocket

Lethaldosage423

that would be my first guess, then possibly a stuck thermostat.

there could also be a blockage in the system and when the water pump builds pressure at higher RPM, it forces the coolant through.

Nuke

Possible, but the OP's not seeing any overheating due to flow blockage at low RPM.