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<blockquote data-quote="EdMuse" data-source="post: 1290406" data-attributes="member: 564149">Okay, I think I&#039;ve decided what I&#039;m going to do.&nbsp; I just spoke with Blaupunkt, who told me that they don&#039;t publish ambient tem data on their gear (translation: the guy on the other end of the phone didn&#039;t know and didn&#039;t feel like checking), but that all stereos from any company would have the same resistance to heat.&nbsp; Now, this may well be bull, but where I&#039;ve gotten about the same data from three different companies (140 degrees as the upper limit), I&#039;m ready to believe it, if only so I can get on to replacing my HU.I picked up some self-adhesive foil and foam duct insullation, about 1/8&quot; thick.&nbsp; Originally, I was going to use it to wrap my ductwork, but the more I got to thinking about it, the more it occurred to me just how much ductwork I have, and how embedded it is behind the dash (the dirty little secret of Volvo 240 ownership, for instance, is that replacing the HVAC blower motor is an 8-hour job which requires the removal of most of the interior of the car).&nbsp; So, I think what I&#039;ll do is use this stuff to fashion a little space for the HU itself.&nbsp; The HU mounts top center in the dash, and just behind and above it is a vent.&nbsp; I should be able to insert the insulation below the sleeve, then attach the insulation to the underside of the dash, extending back to the vent.&nbsp; That way, the air in this little &quot;micro-environment,&quot; heated buy the stereo, can escape through the vent, but the whole area will be insulated from the rest of the space behind the dash.The crowning touch is born of the fact, related to me by my uncle who builds computers, that a PC&#039;s power supply puts out 12 volts.&nbsp; So, and 80mm computer case fan, mounted to the vent, and perhaps a slot dremelled into the trim above the HU as an intake, will keep a steady stream of airflow at the ambient temp of the cabin flowing over the top of the HU, carrying away the heat generated by the HU itself.It may not be the best of all possible worlds, but it&#039;s probably the best I can hope for.-EdM.</blockquote>

[QUOTE="EdMuse, post: 1290406, member: 564149"] Okay, I think I've decided what I'm going to do. I just spoke with Blaupunkt, who told me that they don't publish ambient tem data on their gear (translation: the guy on the other end of the phone didn't know and didn't feel like checking), but that all stereos from any company would have the same resistance to heat. Now, this may well be bull, but where I've gotten about the same data from three different companies (140 degrees as the upper limit), I'm ready to believe it, if only so I can get on to replacing my HU. I picked up some self-adhesive foil and foam duct insullation, about 1/8" thick. Originally, I was going to use it to wrap my ductwork, but the more I got to thinking about it, the more it occurred to me just how much ductwork I have, and how embedded it is behind the dash (the dirty little secret of Volvo 240 ownership, for instance, is that replacing the HVAC blower motor is an 8-hour job which requires the removal of most of the interior of the car). So, I think what I'll do is use this stuff to fashion a little space for the HU itself. The HU mounts top center in the dash, and just behind and above it is a vent. I should be able to insert the insulation below the sleeve, then attach the insulation to the underside of the dash, extending back to the vent. That way, the air in this little "micro-environment," heated buy the stereo, can escape through the vent, but the whole area will be insulated from the rest of the space behind the dash. The crowning touch is born of the fact, related to me by my uncle who builds computers, that a PC's power supply puts out 12 volts. So, and 80mm computer case fan, mounted to the vent, and perhaps a slot dremelled into the trim above the HU as an intake, will keep a steady stream of airflow at the ambient temp of the cabin flowing over the top of the HU, carrying away the heat generated by the HU itself. It may not be the best of all possible worlds, but it's probably the best I can hope for. -EdM. [/QUOTE]

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