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Replaced radiator and Thermostat, Car Still Overheating

Motor Vehicle Maintenance & Repair Asked by Laurel Smith on January 18, 2021

I changed the radiator today and drove to work, same thing: overheating and boiling. Don’t see a leak from the radiator or anywhere else. The thermostat was changed and still no change. I am stuck, so I need advice. The plug to put the diagnosis machine on under the dash seems to not read. I know it works but no codes even come up. What might be going on with the cooling system?

3 Answers

Next test steps are:

Test for proper fan operation. The fan should come on when the A/C is selected on regardless of coolant temperature, this is a easy way to ensure that the fan works. The fan should come on when the coolant temperature exceeds 200 Deg F and run for around 20 seconds. The run time depends on ambient air temperature and humidity. Fan on time should be less than 1/3 of fan off time. A short fan on ratio indicates good heat transfer in the radiator. Test radiator temperature: It should get hot, over 190 deg F.

Test for a failed head gasket, a common problem on some years of Civics. This is generally considered a test best done by an experienced diagnostician. If one gets all the air purged from the system and more keeps coming the head gasket is likely the cause of the problem.

It can be helpful to use the diagnostic plug and a scan tool to check the system temperature but it is not required. Trouble codes are not provided for overheat problems specifically. A temperature sensor over limit code can set but this does not tell us anything we did not already know.

Answered by Fred Wilson on January 18, 2021

Check the water pump - is it moving the coolant - sometimes the impeller becomes dislodged from the shaft and the driving pulley and shaft work fine but don't rotate the impeller to move the coolant. And, yes, have seen and experienced this on both customer and personal vehicles.

Answered by Solar Mike on January 18, 2021

blockage of radiator fins can cause overheating, water pump system are not working properly can cause overheating, blockage of water jacket can cause overheating , electric fan are not working properly

Answered by Sopuru Ofoegbu on January 18, 2021

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