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Why Is My Top Radiator Hose Hot and Bottom Radiator Hose Cold? (Explained)

Updated: Feb 1

✔ This article has been fact checked.

A properly functioning radiator is vital to the health of your engine. It helps to dissipate the heat generated by the combustion process and keep the engine running at the optimal temperature.

The radiator is connected to the engine via two hoses; the top and bottom radiator hose. These hoses are responsible for circulating coolant through the engine to dissipate heat. It's common for the top radiator hose to be hot while the bottom radiator hose is cool.

In this article, we will explain why the top radiator hose may be hot while the bottom radiator hose is cold and what it means for your vehicle.

Table of Contents:

mechanic checking radiator hoses

Should Both Upper and Lower Radiator Hoses Be Hot?

Ideally, both the upper and lower radiator hoses should be hot to the touch wh