Why does my car overheat when I turn the AC on?
Engine overheating with AC on is generally caused by one of two possibilities. One, is increased engine load caused by a failing AC compressor. Plugged or blocked radiator condenser fins, fans not working efficiently or a water pump that is not circulating coolant could all cause overheating with AC on only.
Does running AC make engine hotter?
Air conditioning actually creates more engine heat in the engine compartment as there is more strain on the engine to operate the AC compressor. Either the fan operates at a higher speed to combat the extra engine heat generated, or there may be a secondary air conditioning fan that runs to provide extra cooling.
When did my car overheat when AC was on?
Last June is when the overheating prob. began at 179k but after spending $ at different shop’s and them finding no real issue’s except to say it’s been a very hot summer I gave up, but it’s AC weather again and my temp gauge want’s to go 3/4 and I’m not dealing with this no more.
What to do if your Toyota radiator is overheating?
A closed thermostat will not allow enough coolant to reach the engine to cool it. If you’re only overheating on the highway, you might just replace the thermostat (especially if you’re driving an older vehicle). Over time, radiators can become clogged or damaged.
Why does my radiator heat up when the AC is off?
The condenser is mounted in front of the radiator and is cooled by the same air flowing through the radiator. When AC is off, the air hitting the rad is outside air temp, when the AC is on, the air hitting the rad has been warmed by the condenser and is now much hotter than the outside air. This is not usually a problem, if you have good air flow.
Why does my Toyota engine overheat at lower speeds?
A symptom of a bad thermostat is an engine that overheats at highway speeds. It may never overheat at lower speeds because it is not working as hard as it does at higher speeds.