Question about 1998 Dodge Avenger

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1998 Dodge Avenger overheating on idle. New thermostat, no oil in coolant or coolant in oil. Fans and relays working. Coolant bubbles like geyser from thermostat housing, reservoir remains lukewarm..?

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  • Dodge Master
  • 1,326 Answers

I agree with john u have some kind of blockage an air pocket or something.

Posted on Apr 09, 2015

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  • Dodge Master
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Could very well be a head gasket ,just because you have no oil in water or whatever doesnt mean to say the gasket hasnt failed between a piston and a water jacket which is the most common type of failure so stop reading these sites looking for a quick fix ,this vehicle is a 1998 ,its old and the gaskets at this age are likely to fail with age .Off with the head and renew the valve seals ,reseat the valves new gaskets renew any suspect water pipes and change the timing belts and water pump if driven by the timing belt at the same time .then it will run for another 15 yrs with no problems

Posted on Apr 09, 2015

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  • Expert
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Did you install the thermostat the right way round. Turn it around to see if it will not solve your problem. If not - it is most probable the head gasket as described by Colin. Remove the plugs on the cylinders and swing the engine with the starter motor. If there is a top gasket leak to one of the water ports, water/water vapor will be coming out of the one of cylinders plug holes.

Posted on Apr 09, 2015

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  • Master
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The coolant overflow tank is not an active part of the cooling system. IT's only there to catch the excess being pushed out when the engine is hot and keeping it to be sucked back in when the engine cools off (instead of air) I think you just need to purge your cooling system (of air) This link covers it fairly well: Bleeding the Chrysler 2 2 2 5 liter and similar cooling system

Posted on Apr 09, 2015

  • Heather Phillips
    Heather Phillips Apr 09, 2015

    Thank you. I did just that (that guide, however, was for a different vehicle; I used the guide from my Haynes repair manuel) this morning and she's running beautifully, no overheating whatsoever. She drank up almost a gallon of half and half, basically just burped, and now she's purring like a kitten.

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SOURCE: overheating

water pump plug heater core radater plug up or head gasket

Posted on Oct 19, 2008

plopit40
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SOURCE: temperature gauge indicates overheating, but engine not overheating, coolant being push into reservoir.

hi my name is brad i see you are haveing a problem and i think i might know the problem. if you have done all of that to your car and it still over heating you might have a blown head gasket one way to check is to pull your thermostat out and fill your coolant leaving the cap off then start you car let it rrun a few minutes and if you see bubbles the radiator its the head gasket even though you wont have coolant in your oil or out the tail pipe. if you check that and ther is no bubbles i have one other spot for you to check ( dont know if you have the 1.5 or 1.6 sohc ) but if you have the 1.6 sohc with the mpfi you should check on the throttle body at the idle air control valve(IAC) you will see two small line`s that have coolant some times on hondas with high millage the line will fill with crud and that can cause a problem.. if you have any other honda needs please let me know

Brad Ross

Posted on Nov 15, 2008

pippall
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SOURCE: 1998 grand caravan overheating

Replace the fan switch first.Thats a comon part to fail.

Posted on Jul 12, 2009

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SOURCE: 1997 dodge neon. replaced coolant temperature

1997 Plymouth Neon, have replaced radiator, radiation cap, thermostate and hoses, still run hot. Fans do not seem to come on, where is the temperature sensor on this vehicle?

Posted on Sep 03, 2009

venexcsd
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SOURCE: why is my 1998 hyundai accent overheating?

The head gasket has gone so pressure builds up in the cooling system and forces water out of the overflow

You need someone to take the head off , skim it and fit a new gasket

Posted on Oct 12, 2009

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1 Answer

1997 Dodge Avenger Missing Radiator relays


It is common for some relay positions to not be used on many cars. These are places for relays that control things that your vehicle is not equipped with. For example, if your vehicle is not equipped with fog lamps, the spot where the fog lamp relay would go will be empty and there will be no connectors in that spot either.

As for your overheating problem, it needs to be properly diagnosed. Most Dodge engines are VERY unforgiving when it comes to being overheated. Even if it was not caused by a blown head gasket, there is a really good chance that it has one now.

Combustion gasses in your cooling system can keep your fans from running, because the gasses push the water down and away from the Engine Coolant Temperature (ECT) sensor that tells the Powertrain Control Module (PCM) when to operate the fans.

Your Avenger is actually equipped with four different fan control relays. It is very unlikely that all of the relays would be bad (or missing).

Proper diagnosis required.

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REPLACE THE THERMOSTAT AND RADIATOR PRESSURE CAP.IF COOLANT LOW, ADD MORE COOLANT THROUGH COOLANT OVERFLOW UNTIL COOLANT LEVEL IN THE COOLANT OVERFLOW STAY AT FULL COLD MARK.REASON POUR COOLANT THROUGH COOLANT OVERFLOW MOST GM CARS DONT HAVE RADIATOR CAP.WHEN YOU GET COOLANT LEVEL OKAY, CRANK CAR LET IT IDLE UNTIL ENGINE GET HOT BUILD UP PRESSURE THEN TURN OFF CAR.CHECK FOR COOLANTS LEAKS AT THE RADIATOR HOSES,CHECK FOR LEAKS AT THE RADIATOR, CHECK FOR LEAKS AT WATER PUMP WEEP HOLE IF YOU SEE COOLANT LEAKING FROM WEEP HOLE REPLACE WATER PUMP. IF CAR OVERHEATING WHILE IDLING YOUR COOLING FANS NOT WORKING CHECK COOLING FANS FUSE AND RELAYS.IF FUSE AND RELAYS OKAY THE ENGINECOOLANT TEMPERATURE SENSOR BAD.

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Replace thermostat.
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