Coolant isn't circulating - Nissan : Datsun ZCar forum :Nissan Z Forum: 240Z to 370Z
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post #1 of 13 (permalink) Old 05-05-2015, 05:49 PM Thread Starter
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Coolant isn't circulating

Hello, so recently my fan blade shattered which caused my car to overheat and destroy my water pump. I replaced my water pump and thermostat, but then when I ran my car, it wouldn't run coolant through the system and my car started to get really hot. I've taken out the thermostat, but it didn't solve the problem. When I take the filler cap off, I can't see any coolant running. Sooo any help would be greatly appreciated.

P.s. I have a 1985 300zx turbo
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post #2 of 13 (permalink) Old 05-05-2015, 06:14 PM
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Perhaps the lower radiator hose is collapsing.

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post #3 of 13 (permalink) Old 05-05-2015, 06:20 PM
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Odd. I saw a post, now it's gone.

It had a good suggestion though - stop guessing and take a measurement. Any kind of thermometer. "Really hot" means little.

And fan blades don't commonly just shatter. What else happened?

Checking for coolant "running" by the filler neck is not a good way to tell if things are right either.
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post #4 of 13 (permalink) Old 05-05-2015, 06:44 PM Thread Starter
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Ill go check the hose. And, by really hot, I meant it was hitting the max in the gauge and starting to steam out. The fan blade broke because it was old and cracked. I was just about to replace it. Also, thanks for the swift replies guys.
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post #5 of 13 (permalink) Old 05-05-2015, 06:52 PM
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Have you checked for head gasket issues? You may have warped a head or blown a head gasket. The problem may not be coolant flow issues.

I don't know how sensitive the VG's are to overheating but many engines don't handle even a single overheat well.

And don't forget to check the fan clutch.
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post #6 of 13 (permalink) Old 05-05-2015, 07:02 PM Thread Starter
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How would I check for head gasket issues? And the fan clutch is fine, I've already checked it.
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post #7 of 13 (permalink) Old 05-06-2015, 03:25 PM
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Originally Posted by Stadick_Shock View Post
How would I check for head gasket issues? And the fan clutch is fine, I've already checked it.
Look for signs of coolant in the oil to start. If you see beads on the dipstick, you might have a head gasket issue. A compression test is another good way to check.

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post #8 of 13 (permalink) Old 05-06-2015, 04:42 PM
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i have an '87 that has had simular issues....

1. one thing that hasn't been mentioned yet is the condition of your radiator cap. yes, sometimes that single, ten dollar part can be one of the causes of an overheat. do you know if it has been replaced? have you checked it lately? visually inspect it and do a pressure check on it.

2.. also, take a look at your overflow resevoir and see it it is full of coolant. sometimes a blockage somewhere can cause the expanded coolant to remain in the overflow tank, instead of flowing back into the system via the line going back up to the radiator cap housing. if your rad cap is failing, then the coolant in the tank won't return. my car was just doing that recently. if not the cap, then you might have another blockage somewhere.

3. sometimes you can look at the heads on the corners and around where the gaskets are seated and you may be able to see evidence of coolant leaking around those areas (dry and wet). this was the case on my car after everything else had been checked. one of the heads was warped and coolant was leaking out.

4. have you had the cooling system flushed? always a good idea.

5. has it boiled over? (coolant coming out of the overflow tank)

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post #9 of 13 (permalink) Old 05-09-2015, 01:28 PM Thread Starter
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Hey thanks guys! It turns out I made a stupid and didn't refill the coolant after I fixed a leak.. But, I did that and it's all fine now.
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post #10 of 13 (permalink) Old 05-09-2015, 01:30 PM Thread Starter
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I have another question though: I'm currently running it without the thermostat until I get the replacement, so would that cause my car to have trouble starting up or causing it to shutdown while driving it? I was maybe thinking that the engine was getting too cold, because the temp gauge doesn't move at all while I drive.(120 degrees)
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