I drove my FEH loaded with 2 adults and luggage and a dog through Las Vegas in July. Outside temp was 117'F in the shade and we had A/C on Max. setting.

As you may know, there are steep mountain hills on I15 going out of Vegas.

Going 70 MPH uphill with A/C on and outside temps of 117'F, the FEH coolent temperature only rose 3'C or about 10'F above normal.

Simply amazing. The coolent temp never exceeded 90'C.

-John