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Odd overheating problem with 2 engines

 
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Old 06-29-2015, 12:03 AM
Eve Eve is offline
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Odd overheating problem with 2 engines

Hey, so I have a 1994 Prelude with a JDM/EDM H23A3 engine, I swapped this engine about 1 month ago and today It overheated 1 bar when I got to work 15 min away sitting in park. The weird thing is the same symptoms happened to my old H23 which is the reason why I swapped it is because it kept overheating, it was running fine temp wise until today, here's what happens, when the fans turn on the temp gauge goes up 1 bar about 3 sec later, the fans turn off and the temp goes back to normal about 2 sec later and repeats. When I swapped the engine I put in a new radiator fan switch that threads on the head next to the temp Sender which is also new (oem unit) didn't replace the sensor on the thermostat housing but I have a new one that came with the JDM engine. Radiator is less than a year old, new water pump, new OEM thermostat, any ideas?
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Old 06-29-2015, 12:48 AM
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Re: Odd overheating problem with 2 engines

I've had fans operate intermitantly. One minute fan worky, next minute fan no worky. Tests say fans should worky. Eventually found three items operating sometimes and not at other times. Took my mechanic 3 weeks of testing, using jumpers and doing anything but a rain dance until one day, the motor, the sensor and the timer box all quit at the same time.
That was a 3g car. Don't know if 4g cars have the timer box that turns off the fan after running 13-15 minutes to cool a heated engine after you shut off the car. But those things do cause fan operation issues when they go kapoot.

Have you replaced the thermostat?
Edit you said new oem t-stat...but why not replace the sensor on the housing? And fan motors do fail at times. Especially the cheapo kind that cost like $35 for fan and all.
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...is a golden car fax kinda like a golden ticket? Sure hope willy wonka didn't put any snozberries in your motor.
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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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Last edited by bykfixer; 06-29-2015 at 12:55 AM.
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Old 06-29-2015, 01:51 AM
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Re: Odd overheating problem with 2 engines

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Originally Posted by bykfixer View Post
I've had fans operate intermitantly. One minute fan worky, next minute fan no worky. Tests say fans should worky. Eventually found three items operating sometimes and not at other times. Took my mechanic 3 weeks of testing, using jumpers and doing anything but a rain dance until one day, the motor, the sensor and the timer box all quit at the same time.
That was a 3g car. Don't know if 4g cars have the timer box that turns off the fan after running 13-15 minutes to cool a heated engine after you shut off the car. But those things do cause fan operation issues when they go kapoot.

Have you replaced the thermostat?
Edit you said new oem t-stat...but why not replace the sensor on the housing? And fan motors do fail at times. Especially the cheapo kind that cost like $35 for fan and all.
I checked the coolant level and it was low, I filled it up to where I can see coolant at the top of the radiator neck, that was about a week ago, now I couldn't. I squeezed the upper radiator hose and there was coolant in there, so it isn't that low I'm guessing . I didn't have coolant with me so I just drove it home, I stopped when I got home and waited for the fans to turn on, they did turn on, but this time it didn't overheat, waited some more and the fans came on again, then turned off. Took her around the block stopped again and fans came on and nothing, the next time the fans turned on, about 3 seconds later the temp rises while the fans are on, the fans turn off and the temp is till above normal, then it goes back to normal. I'm losing coolant so I'm gonna have to find out where the leak is coming from. Possibly air in the system? I'm gonna swap out that sensor on the thermostat housing with the newer one and see what happens;
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Old 06-29-2015, 02:55 AM
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Re: Odd overheating problem with 2 engines

Well I suppose first off ya gotta figure out how much coolant you lose in a given time. I keep 4 32oz gatorade bottles in my trunk with a 50/50 mix. Basically the same as a gallon jug, but much easier to add when only a little is required. Also a good indicator how much I lose in a given situation.

Ok say you drove/ran the engine 30 minutes and lost half a quart bottle. Huge deal. Be prepared to add coolant everytime you start the engine.
Now, where is it leaking? Only you can figure that out, based on sight (puddles) smell (coolant getting on hot engine parts) and time...as in when you shut the car off check for puddles and leaks as the car cools down. I've had low pressure leaks at hose ends that only leaked as the motor cooled. Not hot, not cold. But as the pressure was dropping from hot to cool, a hissing/bubbling sound was soon followed by coolant leaking onto warm parts, boiling off and leaving no puddle.

Also if your radiator has a plastic housing, they can develop cracks which leak and will not allow proper pressure to build inside the system leading to overheating.
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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 06-29-2015, 03:26 AM
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Re: Odd overheating problem with 2 engines

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Originally Posted by bykfixer View Post
Well I suppose first off ya gotta figure out how much coolant you lose in a given time. I keep 4 32oz gatorade bottles in my trunk with a 50/50 mix. Basically the same as a gallon jug, but much easier to add when only a little is required. Also a good indicator how much I lose in a given situation.

Ok say you drove/ran the engine 30 minutes and lost half a quart bottle. Huge deal. Be prepared to add coolant everytime you start the engine.
Now, where is it leaking? Only you can figure that out, based on sight (puddles) smell (coolant getting on hot engine parts) and time...as in when you shut the car off check for puddles and leaks as the car cools down. I've had low pressure leaks at hose ends that only leaked as the motor cooled. Not hot, not cold. But as the pressure was dropping from hot to cool, a hissing/bubbling sound was soon followed by coolant leaking onto warm parts, boiling off and leaving no puddle.

Also if your radiator has a plastic housing, they can develop cracks which leak and will not allow proper pressure to build inside the system leading to overheating.
The radiator looks fine. I can smell coolant, no visible puddles, I have a friend with a pressure tester and I'm gonna try to find it this Sunday.
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Old 06-29-2015, 03:55 AM
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Re: Odd overheating problem with 2 engines

There-ya go!

A leak can prevent proper pressure to build and the cooling system requires a given pressure to properly cool the coolant as it flows. So even when it's full it may not properly cool your motor.

I hope member Jamie pops in at some point. He can explain the need for proper pressure in ways I don't know how...because he knows why and I don't. lol
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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 06-29-2015, 04:00 AM
Eve Eve is offline
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Re: Odd overheating problem with 2 engines

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Originally Posted by bykfixer View Post
There-ya go!

A leak can prevent proper pressure to build and the cooling system requires a given pressure to properly cool the coolant as it flows. So even when it's full it may not properly cool your motor.

I hope member Jamie pops in at some point. He can explain the need for proper pressure in ways I don't know how...because he knows why and I don't. lol
I hope so lol, I do find it weird the temp climbs after the fan has turned on.
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Old 06-29-2015, 01:05 PM
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Re: Odd overheating problem with 2 engines

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Originally Posted by Eve View Post
I hope so lol, I do find it weird the temp climbs after the fan has turned on.
If the Temperature Sensor (Sending Unit) that turns on the fans and/or goes to the Temperature Gauge is AFTER the thermostat in the flow loop, you could see a rise in temp as the thermostat opens and allows the hotter coolant in the engine to flow past that sensor, kicking on your fans and sending the measurement to your gauge, and as the cooler coolant moves into the engine and then past that sensor, the fans would shut off, the thermostat would close (Either fully or partially) and the gauge would once again show a lower reading, Giving you this indication of a cycling pattern.
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Old 07-04-2015, 03:59 AM
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Re: Odd overheating problem with 2 engines

So I rented a pressure tester today and pumped it up, once it hit like 13-14 PSI I started to see coolant dripping pretty rapidly from a black thick hose that looked like it came from the intake manifold to the thermostat housing, also put new clamps on some hoses that go to the FITV that seemed were loose and leaking also, I replaced that hose with a spare one I had from the JDM engine and slapped that on. Good thing I don't drive far because it was loosing coolant fast lol.
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Old 07-04-2015, 06:42 AM
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Re: Odd overheating problem with 2 engines

A clue!!!!

Could be all those micro leaks won't allow pressure to build leading to inefficient flow of the coolant remaining...which was exiting like foxes in a forest fire.
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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 08-03-2015, 04:43 AM
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Re: Odd overheating problem with 2 engines

Did you fix this issue? Mines doing like the same exact thing. I've replace the head gasket up along with all the sensors in the cooling system. I have yet to pressurize the cooling system yet tho..
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Old 08-07-2015, 04:50 AM
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Re: Odd overheating problem with 2 engines

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Did you fix this issue? Mines doing like the same exact thing. I've replace the head gasket up along with all the sensors in the cooling system. I have yet to pressurize the cooling system yet tho..
No, I fixed all the leaks and it doesn't lose coolant anymore, but sometimes the temp only climbs when the cooling fans turn on and go back to normal once they turn off, on my old H23 I did a headgasket as a last resort, 2 weeks later these symptoms appeared, temp climbs as the cooling fans come on and off when they cycle off, since I replaced literally everything in the cooling system and it was still overheating, I went ahead and replaced the engine only to have the same ****. My negative battery terminal is stripped and is loose, I've seen Preludes temp gauges act crazy due to corroded terminals, that could be my issue, but I'm gonna have to replace it and see, also the fans themselves could be weak and not sucking in enough air. In your case I would check the coolant level, if it's low put some in and check for a leak, also check if the fans turn on, Is your thermostat new?
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Old 09-21-2015, 01:26 AM
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Re: Odd overheating problem with 2 engines

It's been awhile, but I think my engine isn't overheating, but the gauge says it is. It started after I fixed my negative battery terminal, the terminal was loose so I fixed it, but after that the temp on the gauge reached H, I heard the fans and they were on, then they turned off and the temp was still near H, the temp then started to go down and I hear the fans cycle on again, temp was not even at normal, temp went up again and repeats, it did it again today so I got my infrared thermometer and the top hose was at 190-200 degrees, bottom 170 or so, while the gauge showed near H, the ground on the valve cover broke off and it's not connected, it also broke the day I fixed the terminal, my sending unit is also a new OEM unit. suggestions?
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