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Civic Si radiator

Old 06-30-2012, 03:05 PM
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Default Civic Si radiator

So I am planning on upgrading my cooling system.. and I was wondering if a full size radiator that is meant for Integra could replace my 2000 Civic si radiator with perfect fitment.
Old 06-30-2012, 03:12 PM
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Default Re: Civic Si radiator

What do you need to upgrade it for?
Old 06-30-2012, 04:48 PM
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Default Re: Civic Si radiator

No, not without cutting the lower mounts off, moving them and then welding them back in. and then fabbing up an upper bracket.

I have to ask though, why? Stock half rad works fine, even a 500hp turbo civic will run just fine with a half sized rad.
Old 06-30-2012, 05:02 PM
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Default Re: Civic Si radiator

Originally Posted by 94EG8
No, not without cutting the lower mounts off, moving them and then welding them back in. and then fabbing up an upper bracket.

I have to ask though, why? Stock half rad works fine, even a 500hp turbo civic will run just fine with a half sized rad.
The reasoning is because I feel like the engine gets hot really fast.
Example, driving around town I can feel the clutch pedal getting warmer, and the engine bay would feel really hot, and once the clutch is hot the car hesitates to accelerate.
(The hesitation to accelerate and warm clutch may be off topic and has nothing to do with heat but I just feel its better to upgrade the cooling system.

Last edited by kaison; 07-02-2012 at 01:10 PM.
Old 06-30-2012, 05:24 PM
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Default Re: Civic Si radiator

You should probably figure out why it's getting hot (hint, it's not an undersized rad) stock rad may be clogged though, heater core could also be plugged or partially plugged. Engine may also be running overly lean (although normally there would be other symptoms besides the heat)
Old 07-01-2012, 02:29 AM
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Default Re: Civic Si radiator

I have an aftermarket half rad, slimfan and shroud. It was 109 degrees here yesterday and on a turbocharged car it was more than capable of keeping temps normal.
Old 07-01-2012, 06:54 PM
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Default Re: Civic Si radiator

Originally Posted by 94EG8
You should probably figure out why it's getting hot (hint, it's not an undersized rad) stock rad may be clogged though, heater core could also be plugged or partially plugged. Engine may also be running overly lean (although normally there would be other symptoms besides the heat)
Im not familiar with heater cores.
On a side note, could a bad water pump cause heat problem?
(I am about to get my timing belt replaced along with water pump)


Originally Posted by grumblemarc
I have an aftermarket half rad, slimfan and shroud. It was 109 degrees here yesterday and on a turbocharged car it was more than capable of keeping temps normal.
What aftermarket radiator? Out here in Los Angeles there are shops offering a half size full aluminum radiator for $65, and i was thinking its too good to be true it must be a knock off company.
Old 07-01-2012, 07:07 PM
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Default Re: Civic Si radiator

Originally Posted by kaison
Im not familiar with heater cores.
On a side note, could a bad water pump cause heat problem?
(I am about to get my timing belt replaced along with water pump)
Heater core is somewhat similar in construction to a rad, hot coolant flows through it, a fan blows over it and you get heat.

As far as the water pump goes, depending on how it's failing, yes it could.
Old 07-01-2012, 07:12 PM
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Default Re: Civic Si radiator

Originally Posted by 94EG8
Heater core is somewhat similar in construction to a rad, hot coolant flows through it, a fan blows over it and you get heat.

As far as the water pump goes, depending on how it's failing, yes it could.
Where is the location of the heat core? And if its purpose is to blow heat into the cabin, how would it affect the engines heat temperature?
Yeah in a week or two, I plan on taking care of my 140k maintenance, and hopefully it will fix the heat problem.
Old 07-01-2012, 07:31 PM
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Default Re: Civic Si radiator

Coolant is supposed to flow through the heater core. If coolant doesn't flow through the heater core, the engine doesn't get the proper flow of coolant to stay cool, and thus causes overheating.
Old 07-01-2012, 07:50 PM
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Default Re: Civic Si radiator

del sol b16 radiator is suppose to be the best
Old 07-01-2012, 07:50 PM
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Default Re: Civic Si radiator

Originally Posted by jbpnoman
Coolant is supposed to flow through the heater core. If coolant doesn't flow through the heater core, the engine doesn't get the proper flow of coolant to stay cool, and thus causes overheating.
Ahh i see, so can you can elaborate on the location of the heater core? I have tried googling but it only shows up topics of people with heat problems.
Old 07-02-2012, 02:51 AM
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Default Re: Civic Si radiator

Check under the dash. YOU might also want to invest in a good manual for your car to refer to items like these.
Old 07-02-2012, 07:34 AM
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Default Re: Civic Si radiator

The heater core is on the passenger side, between the dash and firewall. Get a factory service manual, and either a Haynes or Bentley manual for your car. It'll make your life a lot easier.
Old 07-02-2012, 01:05 PM
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Default Re: Civic Si radiator

OK, lets take a step back. is the engine even actually overheating? is the gauge on your dash reading above half? if not then i dont see any reason to touch the cooling system

lets think logically. why would a warm clutch pedal be any indication that you need a new radiator??

also, forget about the heater core. if there was a problem, it would be leaking or your heat wouldnt work.
Old 07-02-2012, 01:08 PM
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Default Re: Civic Si radiator

Originally Posted by kaison
Thank you for your answer.
The reasoning is because I feel like the engine gets hot really fast.
Example, driving around town I can feel the clutch pedal getting warmer, and the engine bay would feel really hot, and once the clutch is hot the car hesitates to accelerate.
(The hesitation to accelerate and warm clutch may be off topic and has nothing to do with heat but I just feel its better to upgrade the cooling system)
No the engine is not actually overheating, I guess the warm clutch problem just raised a concern for me and from there I got a little creative
But as I said before, I would feel safer upgrading the cooling system altogether.

Last edited by kaison; 07-02-2012 at 01:29 PM.
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