Damn this 97 E420 runs hot! In this heat wave when it's 96 outside, the E429 is fine on the highway running around 90 degrees. When I'm driving stop and go with the A/C on, the engine is registering an alarming 110 degrees! My aux fan is working and kicking in but this scares me as it's the wifey's main driving car and she doesn't look at the instruments like I do. She won't turn off the A/c at stops, recirculate the inside air, etc. What can I do? Is Water Wetter a good solution or is it just marketing hype?

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85 300CD Signal Red/Tan sold
83 300D Manganese Brown 109K
97 E420 Midnight Blue 197K sold
98 BMW 328i Vert White 100K, sold
95 BMW 525i White 125K, sold
93 BMW 525iT Red 193K, sold
95 E320 Green Wagon 125K, sold
94 E320 White 127K, sold
85 300SD 156K Grey (Annie), sold
84 300D Lapis Blue 170K (Judy), sold
99 ML 320 Black (lease), 1998 C230 White (lease)
00 Honda S2000 Red (lease)
86 Mercedes 300E (sold)
84 Porsche 911 Red (sold), 1965 Porsche 911 White (sold)