OK, before anyone says anything I did my search and found a lot of posts on the web with the same problem. Answer seems to be the cooler!
Its a 08 Xterra Off Road
Here is my problem:
Heater blows cool air not like AC but more like fan air when the car is not moving. You can feel it even when stopping at red lights. Once the car starts moving heat turns on. Also when the car is moving I can smell the fume like almost the heat is coming from engine department without any filtration, this happens even if I select circulate cabin air button.
Cooler was at the minimum level in the small reservour.
This is what i did:
I filled the reservoir to max level, and topped the radiator. Put the car on a ramp lifting front end, open the valve and run the engine for 15 minutes about 2000 rpms. I also turn the heat all the way up. After the process topped the radiator and filled the reservoir again to max. Drove for 20 minutes and problem still existed.
Second solution took the car to dealer and told them the problem. They said they didn't have the mechanic on Saturday but they told me they checked the pressure level in the rediator and couldn't find any problems.
Car does not over heat but again I am in Chicago and its around 15s! I checked the cooler again today and seems like it lost some since Friday. Level was a litle under Minimum level.
Its obvious that its loosing from somewhere and heater is sucking air from engine compartment. One other thing is when i turn the engine off if the heat is on I can hear some water bubling right behind the dashboard.
I am going to take the car to another service this week. Does anyone know what this could be?
Thanks.