Author Topic: Totally Unrelated Car Question  (Read 7186 times)

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Offline Racerchck51

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Totally Unrelated Car Question
« on: July 30, 2012, 02:34:47 pm »
Ok my mechanically inclined friends.  I have a serious question..No one else could answer this for me[about 6 different mechanics.] I brought a 98 plymouth neon. The car will run like a champ until you turn the ac on then it will run for a little while and then goes to heating up. We thought it was the catalytic converter, but once that was replaced its still doing it. Any ideas as to what else it could be.

Thanks,
Jenny
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Offline Jeff McKelroy

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Re: Totally Unrelated Car Question
« Reply #1 on: July 30, 2012, 03:02:47 pm »
1. Cooling Fan(s), if equipped with two, one may not be working due to failed motor, or relay contacts/control windings open, or current limited so they are turning slow, or mechanical drag/brush failure, etc.  You really need a graphing multimeter and current clamp to figure out the motor issues.
2. Radiator Restriction - Partial plugged - coolant look like mud?  Gets warm after pulling off highway (A/C off before trying this)
3. Thermostat stuck partially open - check to see of one side of the valve retainer bracket has broken - common problem with Stant's crap the last 10 years.

CAREFULLY observe these items, and let me know.

Jeff

Offline BIG AL 202

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Re: Totally Unrelated Car Question
« Reply #2 on: July 30, 2012, 03:27:50 pm »
Like he said, electric fans are most likely it! But get it checked, If you know someone with a scanner they can turn fans on and off and know for sure.
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Offline amr5080

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Re: Totally Unrelated Car Question
« Reply #3 on: July 30, 2012, 05:36:51 pm »
Check the radiator fins. I saw one with deer damage that had the fins smashed enough to make it heat up after it was ran awhile
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Offline Feather Head

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Re: Totally Unrelated Car Question
« Reply #4 on: July 30, 2012, 06:32:26 pm »
Try a thermostat first!
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Offline Johnson Mowersports

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Re: Totally Unrelated Car Question
« Reply #5 on: July 30, 2012, 06:44:50 pm »
Take the thermostat out and run it and see if it still gets hot don't thank that's it though pull out the oil dipstick and see if the oil looks watery might be the head gasket and it gets hot under load
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Offline rotten ron

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Re: Totally Unrelated Car Question
« Reply #6 on: July 31, 2012, 12:47:42 am »
The rad might be plugged, when it is warmed up touch each tube with your finger to see if they are all hot.If you find cold ones they are plugged,hope you find out what is wrong Jenny

Offline rebelchild16

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Re: Totally Unrelated Car Question
« Reply #7 on: July 31, 2012, 08:09:11 am »
Fans is most likely the last thing to make it run hot if it dont run hot seating idle as they on most cars kick off above 35 MPH. Thermostat would be the first thing to change and don.t buy a cheap one. Ather that would be the radiator half pluged. The longer you run it the hotter it gets. But I did fix a couple over the years with head gaskets, radiator would be my guess.
Your local radiator shop can do a flow test on your radiator just pull it and drop it by.
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Offline Racerchck51

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Re: Totally Unrelated Car Question
« Reply #8 on: July 31, 2012, 08:50:42 am »
Thanks everyone for the help. We know its not the fans, Bookin the head gasket is what a lot of mechanic's we took it to thought, but there was no signs of it.. So i'll let ya'll know what actually fixes it.
Race for the little girl in the stands that you used to be!
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Offline mowinmachine

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Re: Totally Unrelated Car Question
« Reply #9 on: July 31, 2012, 11:26:06 am »
 Its sometimes hard to actually see a any signs of a bad head gasket. But there are a few ways you can check for one.

1: with the engine and radiator cold, remove the radiator cap and then start the car. If you see air bubbles coming up through the coolant, that's probably a bad head gasket.

2: Check the oil. If it has a sort of chocolate milk look or smells like coolant- that means coolant is getting into the oil.

3: Check the overflow reservoir and see if there's oil sitting on top of the coolant.

 But anyway, when was the last time the system was totally flushed out? That probably wouldn't hurt anything anyway. As others have said, a new thermostat is also not a bad idea, plus they're cheap.  If its a blown head gasket, that might mean an expensive repair and you'll need to weigh the options in regards to the car's age and value.
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Offline BIG AL 202

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Re: Totally Unrelated Car Question
« Reply #10 on: July 31, 2012, 05:17:46 pm »
Thanks everyone for the help. We know its not the fans, Bookin the head gasket is what a lot of mechanic's we took it to thought, but there was no signs of it.. So i'll let ya'll know what actually fixes it.

Are you sure they both run? If you have not seen them run you will need to prove it! Is the engine running ok? I have alot of time working on neons, at a chrysler dealer ship and the aftermarket, alot of fans get replaced. It will be hard to see bubbles because of they way the overflow is designed, if you still suspect a head gasket you should test for combustion chamber gasses in the cooling system. There are several different ways to do that, contact your local parts or service place. Prove it first before you guess and it costs you way more than nessesary!
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Offline George Herrin

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Re: Totally Unrelated Car Question
« Reply #11 on: July 31, 2012, 09:05:21 pm »
Sounds like a radiator to me. if it were a head gasket they would be adding water often. I am rolling back over and going back to sleep now!!
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Offline Racerchck51

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Re: Totally Unrelated Car Question
« Reply #12 on: August 01, 2012, 12:05:53 am »
Al both fans are working. They have seen them running. The engine itself runs great, the car is just getting hot after a little while on the highway when you turn the ac on and after today even when you dont turn the ac on. Thats what is throwing everyone off. And George is right its not using any water and if it it was the head gasket it would be using water wouldn't it.


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Offline George Herrin

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Re: Totally Unrelated Car Question
« Reply #13 on: August 01, 2012, 06:24:48 am »
Yes Jenny if it was a head gasket it would be using water. The radiator has veins in it and some of them are stopped up. It cools good for the most part but when using the air its not flowing enough water to keep up with the cooling thats why its doing ahat its doing the way its doing it. BEEN there done that. Fought it for over a year before we put a radiator on it. Had we done it first would have saved alot of money.
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Offline Racerchck51

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Re: Totally Unrelated Car Question
« Reply #14 on: August 01, 2012, 09:15:44 am »
Thanks George, I'll let daddy and the guys Know. I had them stumped when It did the same thing over and over.
Race for the little girl in the stands that you used to be!
The one that cheered for every racer no matter who they were!
The one that said Daddy, I can't wait to be on the track like them?

Jenny Wade