Anonymous
Anonymous asked in Science & MathematicsEngineering · 6 months ago

# 100 degree weather making a car temperature gauge go up?

How does hot weather make car temperature gauge go up?

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• M.
Lv 7
6 months ago

It means that your cooling system is lacking in capacity. The capacity to shed heat.

Maybe, your thermostat is stuck in a partially open position, limiting the system capacity in hot weather.

Maybe your radiator has a coating of dirt on the inside of the tubes.

Maybe your radiator has a coating of airborn dirt or debris on the outside of the fins. Like cottonwood tree seedlings.

Maybe your cooling system is low on coolant. Look inside the reserve tank (reservoir) and inside the radiator when the engine is cool (for your safety). The radiator should be totally full. The reserve tank should be about half full.

You need to find and repair the problem right away. If the situation suddenly gets worse, you could warp an aluminum cylinder head. That is an expensive repair.

-Engine overhaul mechanic and general automotive mechanic since 1972

• 6 months ago

• Steven
Lv 7
6 months ago

Engine coolant runs about 200F because the thermostat opens at that temperature, passing heat to the radiator. If the air is 50F then there is a 150F difference but if the air is 100F then the difference is only 100F so the radiator can handle 100/150=2/3 the amount of heat. This is not a problem if the radiator has lots of extra capacity, but many muscle cars and RVs do not have a big enough radiator to handle the extra heat.

• 6 months ago

The thermal transfer has less to work with. the efficiency of the thermal transfer unit (radiator) is reduced.

An increase in coolant temperature is the result.

• 6 months ago

Your car is cooled by a radiator fan if the air is hot outside you're trying to cool your car with hot air. Just doesn't work too well