I have a heater problem and hope your guys can help me on it.
I have a GS300 and when I start my car outside in the cold weather, my engine will heat up namally but when I turn on my heater to 32C, there is no heat coming out, specially when I start drivng the car.
If I park the car for 10 min. then the heater will heat up. But if I start driving again the heater will cool down by itself, it get worst when I turn on the circulation vent.
I have even checked the heater hose that is connected to the firewall and it's get very hot when I turn the dial to 32C. But still no heat!!!!!!!!!!!!!!
Does anyone have the same problem, if u do pls help me cause I dont like driving the car with no heat at nite.

 

sounds like your heater core is partially blocked, limiting the flow of hot coolant through it. When was the last time the coolant has been changed? Is it dirty? Since it's cheap and you can do it yourself, I would flush your cooling system. Use one of the chemical flush products you can get at a auto store, that should remove some of the stuff in the heater core to get the heat back. Follow the directions, I think you have to drain the system, add water and the flush chemical, drive for a while, then drain again and add new coolant. Check out the directions it's been a while since I've done it.

If that doesn't work you might have to get a new heater core.

 

IMHO this sounds like a thermostat problem, a weakened spring and opens way to soon.

 

thanks for the advises. I will give it a try and hope it will get better.