bull516

I havent had any heat inside the car for a couple months now. I get cold air at idle, and lukewarm air at highway speeds. The coolant was topped of and the problem persisted. I did the ac ecu diagnostic and got code 24. Problem is that I cant find any info on the internet about this code. Anyone have any ideas as to what my problem(s) could be, especially the code 24?
Thanks
2008 IS250 AWD

wyois250

My car just started having the same problem (08 IS 250 MT). No heat at idle but I can get heat on the highway at speed when the cabin air recirculator is turned on.

toyoman29

It sounds like the thermostat or water pump going bad, have they been replaced before and what's the temp gauge showing on the display?

wyois250

It turns out the hose connecting to the coolant reservoir was disconnected so I topped it off. We'll see if that works. Weird I am not sure how that got unconnected unless it happened last month when I was getting a new clutch in a shop.

I have already had my water pump replaced once by the dealership. Temp gauge appears to be normal when car is heated up.

bull516

Thanks for the reply's folks. Turns out it was a clogged heater core. Got it flushed for $60 and all is great now!!! Got heat!!