WHY DOES MY CAR OVERHEAT AFTER GETTING OFF THE FREEWAY

  • Tiny
  • kickjon1985
  • 1998 Honda Civic
  • 179,000 miles

Recently, about a month ago I replaced the radiator in my civic because the radiator had a hole that had started to spew coolant. Other than the leak of coolant the system worked fine no problems with overheating at all. After replacing the radiator the system started heating up (not overheating completely but close once), but only when getting off the freeway. I have replaced the radiator cap, the upper and lower hoses, the thermostat, the clamps on the upper and lower hoses from jesus christ clamps to regular kind, and still heating up. Now during normal in city driving it doesnt heat up like that at all only after being at high rpms. Someone told me a blow head gasket but I have never overheated the car and and it worked fine before I replaced the radiator(of course for the leak). Any ideas?

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Monday, June 25th, 2012 AT 1:00 AM

78 Replies

  • Tiny
  • kickjon1985
  • Member

I have bled the system and it is doing the same thing still. I parked it with the nose up hill and ran the car with the radiator cap off till the thermostat opened and saw coolant flowing, and kept refilling till it didn't need it any more.

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Monday, June 25th, 2012 AT 1:35 AM
  • Tiny
  • rasmataz
  • Member

Okay, now you chemical and pressure test it here are some guides to help you.

https://www.2carpros.com/articles/head-gasket-blown-test

and

https://www.2carpros.com/articles/car-is-leaking-coolant

Please let us know

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Monday, June 25th, 2012 AT 2:15 AM
  • Tiny
  • kickjon1985
  • Member

What kinda chemical testing? Kw? Ph? I will buy a cap and system pressure test kit tomorrow

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Monday, June 25th, 2012 AT 2:18 AM
  • Tiny
  • rasmataz
  • Member

Its a bloc check-chemical tester that changes from blue to yellow in color if there's combustion leaking into the cooling system

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Monday, June 25th, 2012 AT 2:43 AM
  • Tiny
  • KHLow2008
  • Expert
  • 41,994 posts

Are you getting any coolant losses at radiator and/or recovery tank?

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+1
Monday, June 25th, 2012 AT 8:42 PM
  • Tiny
  • kickjon1985
  • Member

Currently no. When the engine heats up it will drop some cause of the engine overheating but not normally.

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Monday, June 25th, 2012 AT 11:24 PM
  • Tiny
  • KHLow2008
  • Expert
  • 41,994 posts

No coolant losses indicates the problem lies with the cooling efficiency rather than anything else. Are the cooling fans working correctly? Is this an automatic or manual transmission?

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Tuesday, June 26th, 2012 AT 1:42 PM
  • Tiny
  • kickjon1985
  • Member

Fan is working. It is an automatic transmission.

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Tuesday, June 26th, 2012 AT 2:37 PM
  • Tiny
  • KHLow2008
  • Expert
  • 41,994 posts

Does both fans work together? Was any repairs done on them previously?

At highway speed are there any indication of overheating?

Is the replaced radiator OEM, new or used?

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Tuesday, June 26th, 2012 AT 2:47 PM
  • Tiny
  • kickjon1985
  • Member

It ussually does t show signs of over heating at highway speeds. After I get off the highway it will start heating up. Ussually after I get back up to highway speed it cools down, but over the weekend I drove it on the highway, it cooled down after getting back on the freeway but after 5 to 10 miles it warmed up above normal while I was on the freeway.

The radiator is a new one from autozone.

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Tuesday, June 26th, 2012 AT 4:00 PM

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