1994 Honda Civic Overheating

Tiny
JOE ZASA
  • MEMBER
  • 1994 HONDA CIVIC
  • 4 CYL
  • FWD
  • MANUAL
  • 175,000 MILES
Just can't figure this one out! It all started with a leaky water pump, so I replaced the water pump and thermostat. Shortly after that the head gasket went out and so I replaced it. Now with all these new parts engine is still running hot. Although it is very specific when it is running hot. It will only run hot when I am running it at a steady speed for about 10 or 15 minutes, if I stop at a light or shift through the gears it will drop from almost being over the normal range to about halfway on the temp gauge. I have bled the system and I don't think there is any air in the system, and I have also run a flush through the system so I don't think it's clogged anywhere, but I can't be sure. If anyone has any thoughts on how I can make this problem quit I would very much appreciate it, I have put way to much work into this car to not have it run right.
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Saturday, April 11th, 2009 AT 12:41 PM

5 Replies

Tiny
F4I_GUY
  • EXPERT
It sounds like your radiator may be clogged or not flowing properly.

How old is the radiator? Are the fins coming off of it?
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Sunday, April 12th, 2009 AT 11:16 AM
Tiny
JOE ZASA
  • MEMBER
Hey thanks for replying,

yeah the radiator is original, that would make sense. I have run a bottle of cleaner through the cooling system but that didn't seem too make any difference at all. When I was changing the thermostat I sprayed water through the radiator and the thermostat housing and it seemed to flow all the way through. Do you know if there is a way I can test the radiator the see if it is clogged? Thank you for your time.
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Monday, April 13th, 2009 AT 12:31 PM
Tiny
F4I_GUY
  • EXPERT
The only way to test the radiator for clogs is to check for hot spots with a thermal gun. You move the gun across the radiator looking to see if it is being clogged in a certain area.
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Monday, April 13th, 2009 AT 4:56 PM
Tiny
JOE ZASA
  • MEMBER
Hey man I can't thank you enough, I looked up how much the radiators cost for these cars and they are so cheap that I just went ahead and replaced it. It fixed my problem instantly, hasn't heated up at all since I put it in. I am very impressed that you could figure that out from the information I provided you, that was ingenious. Thanks again, Joe
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Wednesday, April 15th, 2009 AT 12:36 AM
Tiny
F4I_GUY
  • EXPERT
No problem Joe! This is what I am here for.

Glad you figured it out.
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Wednesday, April 15th, 2009 AT 7:12 PM

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