Heater does not work

That is like asking where parts of your body are located so you can end the pain.

First you have to state whether you have a hangnail, a stomach ache, you cut your foot off with a chainsaw, or your ex-girlfriend came back. You need to do some tests and make some observations to determine where to start. Solving a cold air problem does not always involve replacing parts, and throwing random parts at a problem is the most expensive and least expensive way to diagnose a problem. It is usually less expensive to hire a mechanic to do that for you.

You also need to list the engine size so we can find the correct cooling system if we need to consult the service manual. Next, tell us exactly what the symptoms are. You can have an inoperative heater fan motor, the air blows from the wrong place, the air is cold all the time, etc. All of those have wildly different diagnostic procedures. To just say you have no heat leaves us guessing on what the problem is, and there is no way we can help you find a solution when we do not know what is wrong.

FROM RICHARD

I have a friend who wanted to know where heater valve is located

On those cars that use a heater control valve, it is under the hood, in the middle of one of the heater hoses between the engine and firewall. Most are operated through a small hard plastic vacuum hose coming from the heater control assembly on the dash.