View Full Version : heater control

04-06-2015, 05:35 AM
I have a 2003 158 with 350,000 miles. The last week I have no control over the heater air temp. It will run full heat for a long time then blow cold air. Nothing I do with the temp control affects the temp. It can be really hot, warm, or blow cold. Like there is a control valve loose in the hot water line and it's loose. Don't know if it's related or not, but sometimes when it is blowing hot, I turn the dash top vents on next to the center speaker and it may cool down. Of course those vents are fresh air and never blow hot so I don't know why they would affect the hot air blowing throught the front vents. Any ideas? Thanks.

Aqua Puttana
04-06-2015, 05:44 AM
Maybe try what I suggest in this post? :idunno:



04-06-2015, 03:25 PM
Thanks Vic, will give a go.