When I put the defroster on it won't blow out Heat won't come out the vents or on the floor vents heat only blows out when I put on back floor switch.

When you turn on the heat for the driver seat, it is now cooling instead of heating. It does not matter where I try to turn it on from it cools instead of heats.

its on and blows but no heat

My car is blowing out cold to cool air when in the heat setting. It was working fine until a day ago after I returned home from a recent trip. I noticed that my coolant tank reservoir was low on coola… 

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When i start my car that is heating and off