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An electric fan might not be working.

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Q: Why your 99 civic lx is overheat when you put AC on but not when you put heat on?
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Related questions

Why does your 99 Honda civic dx overheat when stopped?

More than likely the cooling fan is not working. Can be a blown fuse, defective fan motor, or defective temperature sensor relay.


Why does a 99 KIA Sportage still overheat then shut down after flushing the radiator changing the heat thermostat water pump and fan clutch?

Check to see if the thermostat got put in backwards. Make absolutely sure it's completely full of coolant.


What kind of oil to put in 99 Honda civic ex?

5w-30 or 10w-30 depending on season of the year


Does a 99 civic have a hydraulic clutch?

No it's cable clutch. Well at least in mine. 99' Honda Civic EX model


Does a 99 civic exhaust fit a 94 civic?

it depends on what kind of civic you have (coupe, hatchback, or sedan). you would have to modify the lengths of the pipes to get it to fit right though. I'm about to take the exhaust off my old 99 sedan and put it on my 94 coupe and just measuring it I saw a major difference in the length of the pipes.


Will a 94 Honda Civic driver door window fit a 99 Honda Civic?

No


How much does it cost to change transmission from manual to automatic in 99 or 00 Honda Civic?

how do i change the interior on the door panel of a 99 Honda civic dx


Will 96-98 Honda Civic sedan tail lights fit a 99 Honda Civic sedan?

yes, tailligths are the same years 96-99


Does 99 civic hatchback dx have power steering?

yes


How do you remove the steering wheel on a 99 Honda civic?

chainsaw


Where is coil in a 99 Honda Civic?

under the distributor cap


Does 99 civic have struts or shocks?

most likely struts.