2005 Sienna only blows heat while driving, not idling - what's wrong?

Asked by Nov 14, 2014 at 04:16 PM about the 2004 Toyota Sienna 4 Dr CE Passenger Van

Question type: Maintenance & Repair

2005 Sienna only blows heat while driving, not idling - what's wrong?  Blower always
works, but it's only warm when driving.

2 Answers

190

I am having the same problem with my 2007 Sienna. As long as the car is moving I have heat. As soon as I stop for a light the temp drops. Can has been in the shop twice now in two weeks.

19 people found this helpful.
80

My 2000 Toyota Sienna just started doing this. When it is fully warmed up, I only get heat when driving. If I hold the accelerator down and hold it at 2000 rpm I get heat. when I let off the accelerator at idle, no heat. I suspect the water pump is failing. That is the only component that I can think of that would be dependent on RPMs.

8 people found this helpful.

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