Follow these steps to handle and overheating engine if you car, truck, van or suv. Car runs hotter on Highway F30 / F31 / F32 / F33 / F34 / F36 (2012 - current) Because your car hugs the road it is constantly being bombarded with debris such as dirt, hair, leaves, trash and bugs to name a few. Again, this is false, most hybrids have EPA mile per gallon city estimates in the 30's to 50's best case. If your car seems to overheat in city traffic but not on the highway. I pulled the first oem thermostat and drilled 2 small holes, which helped and it only ran slightly hotter than normal. ... Get on the highway and drive it long periods at around 2500-3000 rpm. That way it will give you a little extra time in stop and go traffic, and will still be hot enough running down the road. ... id deff flush radiator add radiator relief.alot of fans lower at highway which you allreddy know,i liked the cardboard test myself.those fans are tempermental that way . But I know that a simple water flush with the rad in the car would never have got it cleared out. At that point, I would flush out the system and refill it with fresh, clean coolant. If there is a primary reason for an engine overheating for both of these reasons, it would be that the radiator is not able to properly lower the coolant temperature. Because of this cooling fins can become plugged stopping air flow through the radiator core causing the engine to overheat. Once your car has cooled off, turn the ignition to its first position (don’t start the engine). After all, if your car is baking in the sun at 90 to 100 degrees and the engine hasn’t even been turned … Check to make sure nothing is blocking your front bumper openings. I will take you though the steps to figure out what is wrong so you can fix it yourself. My 302 runs hotter on one side, but i have spark on all plugs. Serious damage can occur if your engine is overheating. Idle the engine for a couple of minutes and then finally turn off the engine. Oil temp is a direct reflection of load. Then I purchased a new 2nd oem thermostat and it runs hot again about 3/4 way up gauge. When you are driving around town you horsepower loads are less-stop-n-go, etc. Each cycle the water makes is hotter and hotter until it exceeds the capacity to sufficiently remove heat. After that second rodding-out and flush, the car was OK and never had the problem again. If this problem happens while the engine is cold, it may be part of the engine's design. If you face the overheating problem while driving, first stop the car, turn the heater on full blast so that the heat is pulled out from the coolant to the ambient air of the car. Car is rough until approx 30mph. Hagerty Drivers Club member Paul V. Romero writes: My ’67 Mustang with its original 289 V-8 runs hotter than normal during the summer months.I live in Santa Fe, New Mexico, where it doesn’t get much above 90 degrees. Stay Calm & Pull Over Safely. Never operate your engine without a thermostat! Next, turn off the AC. First of all, my car is an 82 Subaru DL with 189k miles on it. ... 1969 Z11 Pace Car - L48 350cid/300hp - 4 Speed Muncie 12 bolt rear. Richard Rowe has been writing professionally since 2007, specializing in automotive topics. any suggestions? How does the water flowing too fast cause the engine to overheat? Yes it continues to get hotter and boils over coolant tank, if you don't shut engine down it get hotter. Your engine may be able to stay cool at low speeds because it's not working that hard, and therefore not creating as much heat. 6 Most Common Reasons Your Car Overheats. 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