Corey

I changed my radiator back in September and I'm still having issues with my heater and now I'm wondering if my coolant to water ratio is off. My heater is warm if I'm driving, but at an idle it feels cool.

4Driver4

Not a mixture issue. More likely needs to be bled at the heater core.

Greyhound Guy

Is your coolant running at the right temp? Could be thermostat.

4Driver4

I think a bad t-stat would produce the opposit - high temps at idle, cooler while driving.

BSK auf Arbeit

open your coolant cap just a little bit so air can escape and drive around like that for a day or so

Greyhound Guy

You are right. I read it wrong, nevermind.

Perpetual Novice

I would remove the hoses at the back firewall connector, and try to use a garden hose to flush out the heater core.

what coolant are you using,? has it ever been flushed or cleaned? Does the expansion tank have any muck in it?

Corey

In September I replaced the radiator, lower hose, oil cooler and expansion tank. The coolant is as pink as can be.

Corey

The thermostat is fine. I replaced that a few months ago.

77'911

Unless the ends were plugged there could be one stuck in the system. Seem that happen before. My guess is the valve that allows the coolant into the core is failing but its worth some diagnostics.