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Overheating issue while stopped (replaced some parts already)

 
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Old 07-12-2013, 12:34 AM
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Overheating issue while stopped (replaced some parts already)

Hello,

I have a 1996 Honda Prelude VTec that seems to be overheating.

***Symptoms***
- Temperature gauge goes beyond half (sometimes to full) when at a stop
- Temp goes back to normal while driving
- Both fans kick in when ONLY temp gauge is full (WHY IS THIS?)
- Single radiator fan never comes on alone

***Other Info***
- Relay is ok
- I noticed it gets to 1/4 them in the morning in about 15-30 seconds after turning on car.
- Both fans turn on when AC is running

***Have replaced and issue still happening***
- Burped the coolant
- Thermostat
- Radiator Cooling Fan Switch
- Coolant Temperature Sensor


Anyone know what would cause both fans to come on only when temp gauge is full? Owners manual says radiator fan should come on at like 92-98 degrees, but anything else kick on BOTH fans besides AC? I'm stumped.

Thanks,
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Old 07-12-2013, 02:05 AM
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Re: Overheating issue while stopped (replaced some parts already)

have a somewhat similar problem. I traded an 00 accord for my 93 with minor problems this being one. it would overheat with AC on at a red light (shut it off it returns to normal) I changed the thermostat, burped the lines, even did a full flush. all this did nothing noticeable... after fumbling around some in the engine bay I realized that the plug was a little corroded from rain and stuff from where they guy before me did an engine swap and didn't clean up completely. it could be something that stupid.

have you actually seen the fans turn on when it overheats?
if that doesn't work test all the wires for the fan and make sure your thermostat actually opens. ive gotten a few that don't work brand new. seems to me preludes like to run hot
hope it helps a little.
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Old 07-12-2013, 11:07 AM
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Re: Overheating issue while stopped (replaced some parts already)

did you look through the service manual for troubleshooting steps?
that would be first....

but sounds like an issue with the fans somehow, possibly wiring... not sure. check the service manual, you can download a copy from the DIY section here on the forums.
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Old 07-12-2013, 05:02 PM
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Re: Overheating issue while stopped (replaced some parts already)

How's your overflow level? May be low on coolant.
Any idea how much water/coolant ratio is? 50/50 is good.
Sometimes the radiator cap doesn't function proper. Replace it.
I say all this based on you stating it cools down when you get going again.
How clean is the outside of your radiator? Bugs etc block air flow.
What's the air temp when this happens? If it real hot and humid you may need to add coolant additive like purple ice.
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welcome to site Carl
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I remember my first thread, asking what a noise was when I got going 110mph.
Pretty much got flamed for driving like a jackass and was told to slow down. And I'll be damned, slowing down fixed it.

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Old 07-12-2013, 09:18 PM
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Re: Overheating issue while stopped (replaced some parts already)

Thank you for the replies

@blacktater - I have seen the fans turn on when it overheats, only when the gauge goes all the way hot, not 3/4.

@ProjectPrelude95 - Thanks for the reply, I did check the service manual, which is why I've replaced the parts I have so far. Also looked through the forums for similar issues/solutions.

@bykfixer - Coolant level is good.
No idea about water/coolant ratio, but I'll check into that :)
Radiator cap seems good, but may replace, it's cheap enough.
Radiator itself is relatively clean
And the overheating has happened on cool (70 degress) to hot (95+)... the thing is it doesn't seem to happen every single day... so far it's happening about 2-3 times a week to and/or from work. Very puzzling

I'm going to check the wiring/corrosion like you guys suggested.

Thanks again!
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Old 07-12-2013, 09:47 PM
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Re: Overheating issue while stopped (replaced some parts already)

go to your local auto store, or a harbor freight and get a coolant tester for $20 or so, and test the ratio like bykfixer said. that could be the problem for sure.

the ratio of coolant to water affects the boiling point and freezing point of the water in your cooling system. So if your levels are off for the recommended ratio for the temp it is outside, then that could be the problem. maybe the previous owner had leaks, or overheating issues, and just kept adding water like an idiot, cause thats what they do on tv shows and **** deceiving people to do stupid stuff in bad situations.... that could cause this issue. let us know
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Old 07-13-2013, 03:19 AM
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Re: Overheating issue while stopped (replaced some parts already)

ahhh well is the antifreeze moving? I had to replace my radiator after the previous owner drove down a dirt road for many years. im pretty sure atleast one of the fans should be constantly running if the AC is on.
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Old 07-13-2013, 08:24 AM
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Re: Overheating issue while stopped (replaced some parts already)

Ac on = a fan on yes.
My guess is your new thermostat is not functioning correctly. It happens.
If you have all water in the radiator it would run hotter, but it would be consistantly running hot.
Your occasional issue tells me the thermostat opens n closes inconsistantly.
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Quote:
Originally Posted by ogsmakdade View Post
welcome to site Carl
...is a golden car fax kinda like a golden ticket? Sure hope willy wonka didn't put any snozberries in your motor.
Quote:
Originally Posted by elspectro29 View Post
Only seen the first one, 15 years ago in theaters. Plan on keeping it that way. Get off my lawn.
Quote:
Originally Posted by Lindso View Post
I remember my first thread, asking what a noise was when I got going 110mph.
Pretty much got flamed for driving like a jackass and was told to slow down. And I'll be damned, slowing down fixed it.

God's Not Dead
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Old 07-16-2013, 07:02 PM
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Re: Overheating issue while stopped (replaced some parts already)

Thanks again for all the replies

The problem was the wiring. The cable from the wiring harness to the temperature sensor was chewed off! Looks like I'll be parking away from the bushes from now on...

Once the wiring was fixed, the fans kick in after it's been at 1/2 temp for a while. The fans also stay on for a bit after the car is turned off, never noticed that before; these wires must have been chopped for a while... my commute was only 1 mile until this recent move .

Anyways, thanks again!
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Old 07-16-2013, 08:05 PM
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Re: Overheating issue while stopped (replaced some parts already)

Woohoo...
Glad you solved it that easily.
I had a mouse chew the fuel line at the tank connection point... twice. We think it was a mouse anyway.
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Quote:
Originally Posted by ogsmakdade View Post
welcome to site Carl
...is a golden car fax kinda like a golden ticket? Sure hope willy wonka didn't put any snozberries in your motor.
Quote:
Originally Posted by elspectro29 View Post
Only seen the first one, 15 years ago in theaters. Plan on keeping it that way. Get off my lawn.
Quote:
Originally Posted by Lindso View Post
I remember my first thread, asking what a noise was when I got going 110mph.
Pretty much got flamed for driving like a jackass and was told to slow down. And I'll be damned, slowing down fixed it.

God's Not Dead
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