I had an overheating issue that would manifest after 20 to 40 minutes of running the car, which was due to an air pocket. Only use the specified type of antifreeze to top off the system. Guess what? When I let them get lower it very quickly drops back to normal. I told the new owner about this issue and priced the car accordingly. If the engine were removed from the car and mounted to a stand, the engine may be capable of turning 10,000 RPM without any problem. Low coolant can cause overheating. His did the exact same thing. Happens every time. Usually if it overheats at idle you check the radiator fans, radiator fins bent or clogged, but I have heard of a bad secondary fan causing this issue when high rpms would make the temp go down. My car says overheating idle engine but there is no smoke or anything . I opted to make the car someone else's problem. been there done that. The potential causes of a car overheating at highway speeds are a stuck thermostat, a restricted radiator, or a kinked hose. It mainly occurs when the engine is under a load or higher RPM. By very quickly I mean maybe 30 seconds. Hi there as anyone expirenecd overheating at high way speeds of 60 mph. At highway speed (60+) after 10-15 minutes of driving the temperature will slowly creep up. Before we get into the causes of vehicle overheating, let’s help minimize the potential damage to your car NOW until you can get it into a shop: 1- Turn off the AC immediately. When an engine overheats at higher rpm it could mean your coolant is moving too fast to cool while in the radiator. 2- Turn on your defroster and your heat to HOT, fan on High. ... Trust me, when you have a puller fan, and you wire it as a pusher, driving at 45 the car will overheat from nearly no airflow thru the radiator. This one is a little more complex because it could be any number of things. I pull over and shut down engine, restart immediatley and temp starts to fall back down to normal. The temperature gauge moves towards the red, it can however be controlled by reducing the engine load and the gauge then moves back down to the centre mark. High rpm pull through 1-2 gears, car starts to overheat badly. My car has started overheating on the Motorway above 3000 rpm. I can reverse this creep by simply turning the interior temp gauge to hot, but it drops faster if I turn on the blower as well. I won't even get into flywheels or clutches at such high RPMs. In all other conditions the cooling system appears to work well. The car had a dealer replaced radiator back at 90k … Belts tend to come off and pulleys tend to come apart at higher RPMs. Not a TDI, but your problem sounds so similar. You get the idea. I am suspecting it is combustion related and could be a fuel injection problem or a timing problem. Then I bought my TDI, which I still have 12 years later. other than that, car runs fine all day, daily driving. Coolant gets forced out of reserve bottle everytime. If not for the head gasket problem, I'd still have the Mercedes. The car was a 1987 Mercedes 300D Turbo with the OM603 engine. My coolant was recently put in at jiffy lube two months ago. I have an older diesel car (1985 Toyota Corolla) and has an overheating problem. This could get pretty ugly when pulleys start coming apart. If your car is overheating while driving at highway speeds, you’ve got a different kind of overheating problem. My 2012 Impala goes to red (H) when I drive a certain speed and also within 15-20 minutes of driving. The fan normally stays running even when i got my car off but it’s not doing that. Truck: 2006 3500 4X4 Auto (48RE) dually crew cab. 3- No, seriously. I have a 57 chev that overheats on the highway 350 cu inch , I have had the problem with my first engine and had another rebuilt with the same result. Your vehicle is overheating* and you need to do something about it RIGHT NOW. Engine break-in complete. Solved - Engine Overheat Only over 2500 RPM My truck very quickly overheats whenever I let the RPMs get to 2500 or above. My 2003 Outback Sport has had an overheating problem since the weather has warmed up (2 months/ 3k miles). On opening up the bonnet the radiator and tubes are hot. Air bubbles in the cooling system can also cause issues. That said, some of the the basic things you can check when your car overheats at idle include: The coolant level. My Car Overheats While Driving. ratio411. I have a large rad from a 1980's diesel chev 1/2 ton, it was rebuilt before I put it in the car and has been rechecked. Only check when the engine is cool. 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