Engine Overheat

1993 HONDA CIVIC
180,000 MILES
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CIVICUSER
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Hi-

I have just replaced the radiator of my car. It's fine for the first few days. After about a week, when I get on the highway, the temperature seems still fine though sometimes the temperature may be a bit higher. But once I get off the highway, the engine temperature start to noticeably heat up and finally hit the red zone and won't go down.

What is the possible cause of it and what is the reasonable price range to repair it?

Thank you
Apr 16, 2012 at 7:41 AM
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FIXITMR
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does your radiator cooling fan work when it's hot?
Apr 16, 2012 at 9:25 AM
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FIXITMR
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is thermostat new?
Apr 16, 2012 at 9:26 AM
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CIVICUSER
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The radiator fan were working when I opened the hood but I am not sure if it was working in other time. The Thermostat is like 5 years old.
Apr 16, 2012 at 10:28 AM
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MHPAUTOS
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Replace the thermostat and ensure that the fan is turning on, start here.
Apr 16, 2012 at 11:23 AM
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CIVICUSER
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Thank you for your answer.
What's the reasonable price range to fix it?
Also, could it be the cause of the blown head gasket as well?

Thanks!
Apr 16, 2012 at 11:39 AM
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DJCL
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Why was the radiator replaced. Was it cracked , leaking @ the seam. Or running hot.
Apr 16, 2012 at 11:39 AM
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CIVICUSER
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I had to add coolant like every week. I took it to the repair shop, they said the radiator was leaking. So I replaced it with a new one.
Apr 16, 2012 at 11:48 AM
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CIVICUSER
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Also, they said the the bottom side of frame(the rubber or plastic part) of the radiator was broken.
Apr 16, 2012 at 11:50 AM
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DJCL
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If after replacing the t stat and verifying fan operation if the problem persist I would have a block test done to rule out a head gasket problem.
Apr 16, 2012 at 12:02 PM
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CIVICUSER
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So what kind of cause do you think it might be for the engine overheating in this case?
Apr 16, 2012 at 12:03 PM
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MHPAUTOS
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Thermostats are quite cheap,depending on brand around $25-35 there abouts, i would replace it and just run with clean water for the first week and see if the system is ok, if all is good add the coolant as required, don't add coolant first up just in case you have to drain it again.
Apr 16, 2012 at 12:05 PM
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CIVICLX OWNER
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I have the same issues with my 1998 Honda Civic and my radiator and thermostat are new. I also had white smoke comimg out of my tale pipe the other day. What is a block test?
May 2, 2012 at 2:12 AM
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DJCL
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White smoke is an indicationof a bad cylinder head gasket get a block test done.
May 2, 2012 at 2:22 AM
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