Why does my heat work on defrost but not when it's blowing through the vents?

10

Asked by Feb 15, 2015 at 11:56 PM about the 2005 Chrysler 300 Base

Question type: Maintenance & Repair

Had the heat on in my car and I noticed that
it was blowing cold air, so I checked my
antifreeze and seen that it was low. I filled it
back up with 50/50 and it only took about
half a gallon. Heat started working again, so
I continued my trip and drove maybe 2
hours and noticed that it was blowing cold
air again so I checked my antifreeze again
and it was fine. So now my heat will work
only on defrost and it has to be wide open.

2 Answers

750

SOUNDS LIKE YOU MIGHT HAVE AIR TRPPED IN THE COOOLING SYSTEM ONE SIMPLE BOUBLE CAN MAKE A CAR DO CRAZY THINGS.SO LOOK FOR THE BLEEDING VALVE OPEN IT UP AND LET OOZE OUT TILL YOU HAVE A STEADY STREAM COMING OUT.OH YEAH YOUR GOING TO HAVE TO GET MORE COOLANT

10

I kind of figured something like that. Because I let the car cool and I filled it up to the "cold full line" which is maybe 4 to 5 inches down from the top of the reservoir. But at the top close to my radiator cap, there's a hose and there's an air bubble where the hose connects to the reservoir. Could that be the problem?

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