Question about Plymouth Neon

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I have a '99 Plymouth Neon that overheats. I have replaced the thermostat and even the radiator. Problem is that it stills gets hot. What next?

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Check water pump velocity, find a connection at resvoir or heater hoses, disconnect with engine cool, substittute a clear piece of hose in its place or leave it off, start engine and check for good flow. Also you need to check your cooling fans, to make sure they are working properly. You can also purchase a block tester kit from your local parts store to test for combustion gases(blown head gasket) in the coolant. ALWAYS remember air pockets trapped in coolings system have to be burped out to have a proper cooling system function. ANY time you open a coolant hose componet air gets in, it has to be bleed out or the result is a HOT engine. TIP: turning on your heater to full will assist in the "burp" process, as well as finding the highest point of gravity on the engine to allow air pockets to escape.

Posted on May 18, 2011

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Do a collant system flush. You have already spent too much money because the clog may be in the engine. Big big warning. Before doing a cooling system flush, check your oil color. Should be normal. After the flush make sure it is still normal and not tannish. This spells trouble big time.

Posted on May 18, 2011

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2 Answers

Engine over heats


Check for collapsed radiator hose first.

Do the cooling fans come on? If not, check fuse, relay and if still no function- fan thermostat switch.

If fans do come on, replace water pump.

Jan 24, 2012 | 2001 Plymouth Neon

2 Answers

Running hot, replaced thermostat,replaced waterpump. still running hot within a few minutes of running.


if it is overheating within a few minutes of running first use a laser temp gauge to ensure that the gauge is working. if it is then next step would be to have the block tested. even with a stuck thermostat it shouldn't overheat that fast.

Sep 25, 2011 | 2005 Chevrolet Tahoe

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My 1995 Plymouth Neon will run fine as long as it's cool. But as soon as the temp outside comes up, it shuts off & will restart within a few minutes. If you do this very many times,, it just...


if car shuts off when hot outside, change thermostat and radiator pressure cap.-- heres more-car shuts off when tempurature of engine gets to normal. causes; low coolant, failing coolant temp. sensor, air in water pump. it takes 10-15 minutes to reach normal range. hope this helps! good-day!

Sep 01, 2011 | 1996 Plymouth Neon

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2001 plymouth neon heater won't blow hot air. only cold. we have changed thermostat, radiator cap and flushed radiator. not odor through vents or leaks on floor board(heater core)


There is a problem with your climate control. It is not allowing the vent to open that allows air to pass through the radiator.

Nov 17, 2010 | 2001 Plymouth Neon

1 Answer

Even after replacing the radiator, thermostat and


The problem with overheat is due to poor coolant circulating. The main culprit is the Radiator. When the radiator is clogging up, coolant can't be circulating. The stagnant coolant inside the engine water jacket keeps absorb heat from combustion chambers having no way to dissipate the heat then the engine is overheated. You can test the water pump by removing the thermostat, then hooking everything back. Open the radiator cap, then turn on the engine to see if water flowing down to several small tubes inside the radiator. If water can't go down fast enough to cause over flow at radiator opening then your 90 Legend Radiator already got clogged up. Replace with a new radiator, not even a rebuilt one. Good luck.

Dec 13, 2009 | 1991 Acura Legend

1 Answer

My 2000 neon radiator fan does not come on even when the ac is on. the ac freezes up after a while and the car overheats in traffic


check power to fan when hot, replace fan...
ac is low on refrigerant or condenser is dirty, it is if front of radiator, clean with water hose, or car wash dont bend fins.

Sep 08, 2009 | 2000 Plymouth Neon

2 Answers

Replaced thermostat and has new radiator still gets hot.


If the thermostat is good and the radiator is good, I would next look at the water pump. See if the water pump is leaking. If it is leaking then it is bad and will need to be replaced. Hope this helped and best wishes.

Jul 29, 2009 | 1997 Dodge Neon

1 Answer

96 neon keeps showing hot...not the thermostat, or radiator....help


check to see if the hoses are collapsing or pinched, or the radiator needs to be flushed. could be the thermostat even though you said its not. sometimes when you get a new one, its still a bad one

Jun 17, 2009 | 1996 Dodge Neon

1 Answer

I have a 98 plymouth neon (DHOC) that runs hot.


Take rad cap off when cool & run it for a while with the heater on (not defrost) and top up coolant as needed in rad, about an inch or 2 from top of rad. Let it run until you see rad fan come on & off about 2 or 3 times at operating temperature. Then replace cap, top up return bottle to proper level, and try that. Probably still air in system. If that doesn't cure it, I'd look at faulty or incorrectly installed thermostat, which would be a trip to shop that installed it, if it were me.

Jun 02, 2009 | 1998 Plymouth Neon

1 Answer

95 dodge neon overheating


Have you had your radiator fan checked ? Does it come on when it's supposed to?

Aug 04, 2008 | 1995 Dodge Neon

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