HELP!! Car won't give me hot air!

[meatball1974]

It's -35C here right now... I kid you not.

The car, when idling either in my driveway or at a light, will NOT blow hot air. It stays warm when the car is moving but as soon as I stop at a light, it starts blowing hot. The temp is set high, it's consistantly doing this on all the heat settings (auto, up, down, econ, recirc).

I'm wondering, I heard that there is an aux. water pump, I beleive it is driven by an electric motor, and I "Think" it sits under the intake manifold, what's it for? does it have anything to do with the HVAC system?

It WAS just an annoyance a couple weeks ago, but we hit this cold snap and now it's making the 40min. drive to work a bit of a nightmare.

Can anyone out there offer up some advice?

Luke
Calgary

[s42k5b]

I'm having the same problem in my b5 s4. I don't think the aux water pump has anything to do with the HVAC, but I could be wrong. I have no heat in my car at idle but when i drive it starts blowing hot. Ive came to the conclusion that it is my heater core I'm going to try and flush it out before i go ahead and rip out the dashboard to replace it

[KillA6]

I'm having the same problem in my b5 s4. I don't think the aux water pump has anything to do with the HVAC, but I could be wrong. I have no heat in my car at idle but when i drive it starts blowing hot. Ive came to the conclusion that it is my heater core I'm going to try and flush it out before i go ahead and rip out the dashboard to replace it

This is a problem I have been keeping an eye on for sometime now. My car does the same thing. No heat at idle. I have heard guys say its air in the cooling system, temp sensor, thermostat ect.

My car went in for a TB and stage 3. So new thermostat,water pump, temp sesnor. The car went in doing it and when I got it back same thing. So as far as my problem goes I can rule out thermostat, water temp sensor and water pump.

If the problem isn't fixed after a motor is dropped and all the TB stuff is changed out where else to look?

[s42k5b]

This is a problem I have been keeping an eye on for sometime now. My car does the same thing. No heat at idle. I have heard guys say its air in the cooling system, temp sensor, thermostat ect.

My car went in for a TB and stage 3. So new thermostat,water pump, temp sesnor. The car went in doing it and when I got it back same thing. So as far as my problem goes I can rule out thermostat, water temp sensor and water pump.

If the problem isn't fixed after a motor is dropped and all the TB stuff is changed out where else to look?

I did my tsat and it didnt help the heat issue either. It must b the heater core

[meatball1974]

If it was the heater core, why would it get hot at all? just build up etc that is cloging the core and under low engine speeds and thus, low water flow rates, the core isn't transfering a lot of heat???

I'm curious to know if the flush makes things at all better, this would lead me to believe that it IS the core.

Thoughts?