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Dodge-Plymouth Neon: Overheating

48 messages,  Last post on Aug 19, 2008 at 5:07 PM

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What is this discussion about? Dodge Neon, Plymouth Neon, Dodge Neon SRT-4, Engine, Sedan

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#39 of 48 98 neon cooling fan relay location by blackdayz Jan 08, 2008 (4:48 pm)
the post says that the cooling fan relay location is underneath the battery box. Could it be possible that they changed the location of the fan relay in 98? Any information on this subject would be helpful. I re wired the fans to come on when the ignition switch is on so I know they work.
#40 of 48 95 neon sport by tomw6323 Apr 16, 2008 (3:58 pm)
I have a car with 61 k. When I shut my car off I can hear the water bubbleing back into the coolant bottle. It does not do it all the time. I check my oil everyday thinking maybe it may be a headgasket going. But, there is no signs of coolant in it. My car does not over heat and I recently changed my water pump. What could this be!? Replies to this message: Mr_Shiftright (Apr 17, 2008 7:59 am)
#41 of 48 Re: 95 neon sport [tomw6323] by Mr_Shiftright HOST Apr 17, 2008 (7:59 am)
Replying to: tomw6323 (Apr 16, 2008 3:58 pm) If there is actual PRESSURE in the coolant overflow tank, that is not a good sign.   You can test the coolant for combustion gases and you can also pressurize the cooling system with a pump and then pull the spark plugs and look for coolant on them. Both these tests would reveal a bad head gasket issue.   It isn't always the case that coolant enters the engine oil. It depends on where the head gasket fails within its pattern of various sealing surfaces, holes, openings, etc.   You can get water in the oil, oil in the water, gases in the water, or none of the above and still have a bad head gasket.   I'd certainly keep an eye on this since Neons are a bit notorious for bad head gaskets. But unless you are overheating, you don't have to worry just yet. But keep an eye on that temp. gauge.
#42 of 48 Re: neon still overheating after many repairs [srt497] by ginagitanita Jun 03, 2008 (11:30 am)
Replying to: srt497 (Jul 27, 2006 9:02 pm) I have the same problem, sans the water getting into the carpets. My 96 Neon is overheating when it is in "stop and go" traffic. I have replaced the thermostat, the rad hose, the waterpump, fans are working fine when tested in the mechanic shop.   Mechanic2. told me I need a rebuilt engine, and that he thinks the Neon is burning oil inside of the engine, and this is causing the overheat. However, I am not noticing any leaks, and no "brown" antifreeze. The car is not burning oil. Can it be still an engine/head gasket problem?   Now, I read at another Neon site, that this overheating might be related to the speedometer not working (another notorious Neon problem). Apparently, the speedometer data controls the time the fan comes on and off. Any advise how to check the vires for the spedometer? Replies to this message: Mr_Shiftright (Jun 08, 2008 10:24 am)
#43 of 48 99' Neon overheating by odom Jun 08, 2008 (8:10 am)
I have a 1999 Neon. Overheated after I got it back from staying at an ex-friends house. I found the fuel line had been cut and now am wondering what else they may have done. It overheated the first time after about 80 miles (during the mid-summer). We changed the thermostat and flushed the radiator. Now, I ran it for 30 minutes and no overheat until the rpm was raised over 2,000. The water started boiling and a minute later the fan finally kicked in. I'm NOT a mechanic. The dealer said it could be a 101 different things and to get it fixed would cost more than the car is worth. I'd still like to try to fix. Can someone offer a tip or advice. Thanks Replies to this message: Mr_Shiftright (Jun 08, 2008 10:27 am)
#44 of 48 Re: neon still overheating after many repairs [ginagitanita] by Mr_Shiftright HOST Jun 08, 2008 (10:24 am)
Replying to: ginagitanita (Jun 03, 2008 11:30 am) If you have only low speed overheating and not high speed overheating then definitely you have an AIR circulation problem rather than a coolant circulation problem---so your suspicion about the fans is a good one in terms of diagnosis.
#45 of 48 Re: 99' Neon overheating [odom] by Mr_Shiftright HOST Jun 08, 2008 (10:27 am)
Replying to: odom (Jun 08, 2008 8:10 am) If the dealer doesn't know what the cause is then how could they know that it costs more to fix than the car is worth?   Get a proper diagnosis. Have the cooling system pressurized by someone who actually wants to fix your car and cares enough to diagnose it, and with the system pressurized, extract the spark plugs and look for the presence of coolant in the cylinders.   You don't necessary have to have a water/oil mix with a bad head gasket.   You can also test the coolant with a chemical for the presence of combustion gases in the radiator. If there are combustion gases, you are "boiling water" as you drive, like a tea kettle--either from a bad head gasket or a cracked cylinder head.   If both these tests show up negative, then you have to check for radiator clogging, inoperative cooling fan motors,etc.
#46 of 48 96 Dodge Neon Bubbling in tank by randy58 Jun 19, 2008 (2:59 pm)
I have change the head gasket with another head. I still have bubbling in the over flow tank. I did not see anything wrong with the head or gasket i just removed. Replies to this message: Mr_Shiftright (Jun 20, 2008 9:02 am)
#47 of 48 Re: 96 Dodge Neon Bubbling in tank [randy58] by Mr_Shiftright HOST Jun 20, 2008 (9:02 am)
Replying to: randy58 (Jun 19, 2008 2:59 pm) You can't always spot head gasket defects visually and unless the "other head" was a new one, you still don't know if you have head gasket problems or a cracked head without testing.   Once you've eliminated head gasket as the issue by a pressure test and combustion gas test then you can confidently throw money at cheaper repairs.   One reason I'm pushing on this is that the Dodge Neon is notorious for head gasket issues. It's one of the "usual suspects".
#48 of 48 1995 Dodge Neon Overflow Tank by teresa14 Aug 19, 2008 (5:07 pm)
I have a 1995 Dodge Neon and I bought it used. I started hearing bubbling in the overflow tank about 6 month ago, so I replace the thermostat, then the waterpump and timing belt. The bubbling stopped. I just had a coolant system flush about a month ago, and 2 days ago my radiator cracked, so I just got that replaced today and the guy who fixed it said my overflow tank is cracked. Is it safe to drive like that? Where can I get a new/used overflow tank?

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