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Steve, Service Manager
Category: Honda
Satisfied Customers: 5494
Experience:  25+ years experience as a professional technician; ASE L1 Master Technician
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engine temperature drops to cold when driving - returns to ...

Resolved Question:

engine temperature drops to cold when driving - returns to normal when in idle and parked for 5 minutes or so.
Submitted: 9 years ago.
Category: Honda
Expert:  Steve replied 9 years ago.


The symptom you describe is usually caused by a thermostat that is not closing completely. It is the job of the thermostat to shut off the flow of coolant through the radiator to keep engine temperature up to normal (195 degrees F). If the engine temp is dropping below normal when the vehicle is moving and air is flowing through the radiator core, that indicates the thermostat is not doing it's job and is allowing coolant to flow through the radiator when it should be closed.

Replacing the thermostat will cure this problem.

I hope this is helpful; if so, please click my accept button.... thanks!

Customer: replied 9 years ago.
that sounds good, is there any other possible cause?
Expert:  Steve replied 9 years ago.
The thermostat is the only cause for this that we have ever come across....
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