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Old 25 Dec 2012, 11:01 pm
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Default radiator changed, but no flow of coolant? 95 Civic EX Manual?

I just changed out the radiator because the stock one cracked at the input and I replaced it with a solid 100% aluminium radiator, because I noticed others have issues with the top cracking.

Now the radiator I replaced it with is not a OEM one, has duel row, so it is thicker, but it does fit. The biggest difference is that the inlet and outlet are both 1.25" inches, so I had to change both of the hoses from the stock, the car normally uses 28MM hoses, and now I have 32MM on it, so I tighten the hoses really well with the hose claps.

After replacing the stock radiator, I begun to notice that there is no flow of coolant going through the engine, holes and that the radiator fan will not turn on, even with the cars heat on. The A/C fan works when the AC is turned up, but not the radiator fan when the heats on? It will not turn on. I opened the garage, let the car run for 5 minutes until the heat gauge went to 1/4 like it normally would, still no flow of fluids and the fan never kicked on. I am certain now that if I drove it a few miles it would overheat for sure. Something is not right.

What might be wrong?

Thanks for your help and your time.

Thanks for your reply. The stock radiator did not have a coolant temperature sensor anywhere. All there is is the radiator, two hoses, the top section that bolts the radiator to the car and the fan, which has a power plug for it.

Should a 95 civic have a coolant temperature sensor on the radiator? After looking at the old radiator, it does not seem like there would be any place to put it.

Thanks for your reply again. A while ago I let the car run in the garage for about 15 minutes and still nothing happened. I had the cap open on the radiator, no fluid was showing. The holding tank for the coolant is full, but for some reason it does not seem to be sucking any coolant out of the radiator, into the engine and then back out.

My biggest concern is that there is no flow of coolant. Does the coolant normally flow back and forth between the engine? I drove the car around the block (about 1/2 a mile) and when I stopped the car was making ahh zoom, ahh zoom, ahh zoom noise about 3-4 times then stopped and idled. I thought that was strange, was a kind of vacuum system sound.
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Old 25 Dec 2012, 11:23 pm
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I am sure your stock radiator had a coolant temperature sensor screwed in somewhere yes? Were you able to replace that into the new radiator?

May have to run it longer the extra capacity may be dissipating the heat even before the fans have a chance to kick on.

EDIT: OK if no sensor there must be on the block then.

Go ahead and run it for longer that 5 minutes with your radiator cap (overflow tank cap) off to allow any air to escape. The thermostat should open after a while. The radiator fan does not necessarily come on with the heater. that is only the A/C fan with the A/C radiator fan only comes on when the coolant temperature sensor says it needs to to cool the coolant. And like I said with you basically doubiling the size of the radiator it make take much longer for that fan to come on, if it does at all.
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Old 25 Dec 2012, 11:32 pm
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It could be a few things like an air pocket in radiator, you may need to pressureize the radiator to get the air pocket out. Or it could be a stuck thermostat, replace thermostat. Or water pump shot, replace pump. Any one of these can stop coolant flow.
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Old 25 Dec 2012, 11:47 pm
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Thermostat ? Water pump ?
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Old 26 Dec 2012, 12:02 am
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No coolant flow? Could be:

Temperature sending unit needs replacing

Thermostat needs replacing (could be air in system causing thermostat not to function properly)

Hoses need replacing.
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Old 26 Dec 2012, 12:20 am
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The 1995 Honda Civic came with a 1.5-liter, four-cylinder engine and a five-speed manual transmission. The 1.5-liter engine, like most modern engines, uses a thermostat to control coolant flow between the engine and the radiator. A bad thermostat will result in the engine overheating or not reaching operating temperature at all. The thermostat is near the top of the engine, so it is easily accessible and you can remove it with basic hand tools.
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