I don't know... I have an F-150 extended cab truck and I always have two dtectors behind the seat and one in the toolbox. The toolbox is aluminum though and probably not as hot as a trunk. I see no other option than keeping them in th truck because I work a while, then hunt a while. Coming home and getting detectors is not an option... so they stay in the truck. I keep the ET upside down and it cannot get direct sun on the box. I hang a ballcap over the panel of the V-3 and wrap an extra tee shirt over the box. I'v never had a problem from it and I live in GA. I'm sure it gets plenty hot in the truck sometimes but I try to park in the shade when I can. I park inside at home. I used to keep my Sovereign back there all the time with nothing covering it... for a couple of years... no problem. The windows are tinted though... I don't know but I imagine that helps.
You have to to whatever is practical for you and the way you hunt. If you only hunt on weekends or planned hunts, you can leave your detector at hom but if you hunt whenever you can, or when time allows... you have to have it with you. Maybe it would be better in the rear seat of floorboard with a light colored towel over it or wrappd in a bedsheet, that may help in the trunk too... a little insulation can't hurt. If you are really concerned get a couple of ice packs, freeze them every night, put them in zip locks, wrap them in hand towels and put them under or around the control box, not touching it but near it, then wrap the whole mess in a sheet or beach towel. Just dont get the ice packs too near the machine, just in the wrapping. That should keep things cool enough, considering the insulation provided by a beach towel or bedsheet. Make sure they are bagged and placed so that , if they leak... the detector wont get wet...
of course, you don't want to create a condensation problem, so I would keep a bit of wrapping between the ice packs and the machine....
Than again.. if it were me, I would just wrap it in a sheet or maybe a towel and a sheet for insulation and not worry about it. You could try that and put a thermometer inside, with the detector. Then unwrap it after having it in the trunk and see just how hot it gets when it's wrapped.
You may want some more input before trying the ice packs... but I think if they are well bagged and not right next or above the detector... they will solve the problem. Then just a beachtowel and a sheet may be enough.
Bottom line... you can't hunt if your detector is at home.
Julien
