[Early_S_Man]

folcker,

I haven't experienced the hot weather Permatune failure mode personally in my car, but I can duplicate it very easily on one particular 'silver' Permatune [earlier blue-anodized versions don't seem to have this problem] by using a heat lamp on it during testing ...

My suggestion to others experiencing this problem has been to relocate the Permatune to inside the passenger compartment, say, under the driver's seat, or on the tunnel above shift coupler. As long as case temperature is below 175°F, there doesn't seem to be a problem with intermittent failures or cutouts!