synergy141

I've got an 06 Lexus Is250 that is randomly blowing hot and cold air. The heat will be cranked and working fine while driving at higher speeds but when the vehicle comes to a stop or is driving slow it'll start to blow cold air. I've read that this could be the Air Mix servo but when it only does this at low speed/idle I'm starting to think it isn't. Any ideas?

Thanks.

Gville350

iTrader: (10)

Could also be a symptom of a failing water pump or air in the cooling system. Have you ever had your water pump replaced? Any work requiring opening the cooling system here recently?

Douglasgxp

you probably have low coolant which sounds like a water pump thats on the way out like Gville350 said same thing happened to me when my coolant was low

synergy141

The coolant was really low so I'm thinking that it could have got air into the system. I topped it up but it's still doing the same. It's my girlfriends car so I just took it for a spin. The air pretty much cools down right away once I come to a stop. Anyone have a link for the coolant bleed procedure?

Thanks.