Why car engine becomes hot when I keep my car above 55 kmph

Asked by Shaikalam81 Dec 11, 2016 at 06:05 AM

Question type: Maintenance & Repair

When ever I drive my car above 55 to 60 kmph my
engine becomes too much hot ever I had kept
heavy duty castrol coolent  and fan also works  
can any one give me right answer to it maruti
suzuki  swift LDI CAR

2 Answers

188,355

Check your main coolant hoses going into and out of the radiator. Do this by allowing the engine to be fully warm, then while looking at these hoses, rev the engine up to around 2000- 2500 RPM (or have someone do it for you while you observe the hoses). What you are looking for is to see if one of them collapses. What happens is, as hoses get old, they weaken and can collapse under higher engine speeds. The water pump has enough of a draw on the fluids it can collapse the weak hose, causing a lack of fluid flow through the engine, and thus overheating. As soon as the engine speed decreases, the hose goes to normal and cooling resumes.

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