Why is my transmission fluid going into my coolant reservoir

Hello, I'm Dusty, an auto expert on RepairPal's Car Genius team! If you've noticed a milky strawberry look in the coolant reservoir of your 2010 Cadillac DTS due to transmission fluid, it's likely caused by a leak in the radiator's integrated transmission cooler. For immediate action, it's important to stop driving your vehicle to prevent further damage. To resolve this issue, both the transmission and coolant systems must be thoroughly flushed to eliminate any traces of the mixed fluids. To address the problem, you'll need to replace the radiator with the integrated transmission cooler. It's also advisable to have a professional mechanic inspect for additional damage caused by the contamination, such as damaged seals or hoses. Given the complexity and potential for extensive damage, it's best to seek professional assistance. A qualified technician will ensure proper system flushing, radiator replacement, and thorough inspection for any further issues to restore your car's performance. If you have further inquiries or need assistance in finding a RepairPal Certified shop in your area, feel free to give us a call at 877-913-1554.