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dcamp12
New User
May 30, 2007, 5:09 PM
Post #1 of 6
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Dodge Neon Overheating
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I have a 1997 Dodge Neon. The raditor works, the thermostat works and the fan motor works. My car was overheating, the fan motor was not working. It seems that the relay switch was bad. We bypassed the relay switch to run the fan motor as a temporary fix. That kinda worked, I was still losing water. Then I blew the fan motor fuse. We got a new relay switch but the only way the fan motor will work is to bypass the relay switch and run wires from the battery. It does not work running through the relay.
My questions:
If the engine coolant sensor is bad, will it effect it turning on the fan motors? And why would the relay switch not work?
Right now, I am using water because it does not stay in the car. Even with running the fan, the car does not overheat (gage stays at a normal range)until the water starts to run out. The water seems to start to boil immediately. Why? Also why does the water come out when I am driving and when I park there is a puddle of water? If I use anti-freeze will it not boil?
I am at a loss for what to do next.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
May 30, 2007, 5:58 PM
Post #2 of 6
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Re: Dodge Neon Overheating
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Fan is told to come on by coolant temp sensor which still needs the fuse and relay working properly. It will also come on with A/C request in most cars right away and stay on.
It's likely losing water/coolant because the head gasket is blown in such a way exhaust gas/bubbles into cooling system like it's boiling even before it's hot enough for that.
From cold and full just feel the upper rad hose which has no pressure in it. When you start the engine you will probably notice it get pressure quickly which would normally happen as it warms up but it's the exhaust doing this and with air in the system it can't cool either so it will boil over for real.
You can get a test for exhaust in the radiator or just watch it bubble when it's too soon to be hot and that about proves the problem.
Using anti-freeze will not raise the boiling point enough to help and right now it is just a waste. Don't leave just water in it for too long -- months as it lacks corrosion control if nothing else.
I'm not there watching this but this is about certainly the head gasket and with that fully diagnosed you will have to have the head off the engine to know how much more damage may have occured.
Even with that fixed you still have to find out what's up with the fan. If motor draws too much current it will blow fuse and trip relays. Both problems need to be fixed at once,
T
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dcamp12
New User
May 30, 2007, 6:22 PM
Post #3 of 6
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Re: Dodge Neon Overheating
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Thanks for the information. I read something about a blown head gasket, I was hoping that was not it.
Do you know if there is only one fuse for the fan motor? We replaced a green "30" fuse in the power distribution center. Does the engine coolant sensor go bad?
I appreciate the help. Thank God for the internet. I have found a lot of information, it's just taking me time to figure it all out.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
May 31, 2007, 3:06 AM
Post #4 of 6
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Re: Dodge Neon Overheating
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Should be just one fuse for the fan.
A coolant temp sensor can go bad. There can be more than one. Remember that if there are bubbles/air in the system they can be slow to react,
T
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dinkdink
New User
May 31, 2007, 11:48 AM
Post #5 of 6
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Re: Dodge Neon Overheating
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Where did you find the relay? I've got a 97 in the garage today w/ an overheating problem, the fan was unplugged because it will run at all times, so I I think it's been improperly bypassed to a hot all wire. The load center has only the 30A fuse, no spot for a relay.
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Guest
Anonymous Poster
Jun 6, 2007, 8:46 PM
Post #6 of 6
(9342 views)
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Re: Dodge Neon Overheating
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Sorry I took so long to reply. I have not been online. The relay is located on the drivers side of the car. It is on the wall of the side of the car under the battery. It is a retangular part (approx 3"x4") with a wire coming out of the bottom.
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