Question about 1992 Dodge Spirit

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I have a 1992 Dodge Spirit 2.5L SOHC. Currently, the engine overheats. When you turn on the A/C, the fan turns on, but when you turn off the A/C, the fan turns off. I've let it get 3/4 of the way to the H mark then I turn on the A/C to cool down the engine, so I don't over heat the engine. So far, I've had the radiator flushed, replaced the coolant sensor unit, took out the thermostat, and replaced water pump. So I think the only thing that's left is the Radiator Fan relay switch. Do you think this is the case? It doesn't make sense that it would be the radiator, especially if you turn on the A/C, which activates the fan, and the engine cools down. If it is the Fan relay switch, which one of the relays on the drivers side fendor is it? There are like 6 relays there and none of the wiring diagrams that I've looked at tell you which one it is. Thanks for any help!

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  • truekraut Oct 08, 2010

    now the coolant sensor was that screwed into the engine somewhere? What I am thinking there is a coolant fan switch mounted in the raditor thats bad

  • brent407 Oct 08, 2010

    Yeah, the coolant sensor switch is about 2 inches behind the thermostat. If there was a coolant fan switch on the radiator, I would see some wires that would come out of the connection to the radiator, right? Because I don't see any, but I will need to check again to see if that's really the case. Where do you think it would be located on the radiator?

  • brent407 Oct 09, 2010

    I checked and there isn't a coolant fan switch on the radiator. If I disconnect the cable that goes to the coolant temperature switch that's next to the thermostat, the car runs rough (expected) but it also turns on the fan. Even though this is a new coolant switch, should I buy another one, or do you think there's a problem with the computer?



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This is a good one.
When you unplug the sensor the fan comes on. From what I under stand of this system is when you unplug the sensor your are sending the ECM into a over ride mode, same as your AC.
So it tells me your fan relay is good! There has to be a problem with the wiring of the sensor or The ECM has the problem. Best advice I can give you is to have the ecm tested

Posted on Oct 11, 2010


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SOURCE: Where is the ECU in a 92 spirit 2 5l

Under the radio ahead of the console on the floor below the dash in the middle

Posted on Aug 12, 2009

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Dodge spirit troubleshooting

If it overheats while driving more than 25 miles an hour, the thermostat is bad. If it overheats while stuck in traffic only, either the fan motor or the temperature sensor/switch that controls the fan to operate is bad. This temperature sensor/switch is installed on the radiator. It screws into a threaded hole.

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My 1990 dodge spirit overheats very easy it was overhauled years ago ever since then it over heats easy it sat for few months while torn down

Clogged coolant passages in engine block and head.
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1994 dodge spirit overheats in slow traffic.

I assume you have the 2.5l 4-cylinder engine. These engines have an inherent design flaw that causes this problem. I came up with my own solution, and it has worked well for me. If the dealer says you need to spend mnoney on repairs, he's probably wrong. These cars are designed to overheat in traffic.

The thermostat (the thing that is supposed to open and allow hot coolant to circulate) is located in a housing on the front of the engine, on the top right as you look from the front of the car. If there is any air in the system (and there always is), it accumulates here and forms an air pocket. When the air pocket prevents the hot coolant from touching the thermostat, the thermostat doesn't open and the car overheats.

At the factory, the cooling system is filled through the small housing and then pluigged. Unfortunately, the plug is aluminum, as is the housing, and once it is torqued down, you will never get that plug out again.

I drained the coolant, removed the thermostat, stuffed a rag in the coolant housing to prevent any chips getting into the cooling system and damaging the water pump or plugging the radiator, and drilled through the center of the plug. I then threaded the hole and inserted an allen-head brass plug. Now you can remove the plug, fill the cooling system to the top, and not have to worry about it. I am always sure to remove the plug every couple of months and refill, since air always finds its way in.

2 other issues contribute to the overheating problem: 1. The sensor that goes to the temperature gauge is also inside the thermostat housing, but the sensor that turns on the cooling fan is located in the engine block. The reading on the temp gauge therefore is not what the system uses to decide when to turn on the fan. 2. The fan settings from the factory do not turn on the fan until the engine temperature is very close to overheating. The only way around it is to run the air conditioner, which will turn on the fan when the compressor is on, bypassing the regular cooling fan.

There is no perfect solution, but that is what I have learned from 15+ years of owning and repairing these vehicles.

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Mar 26, 2010 | 1992 Dodge Spirit

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I have 5 trouble codes on my 89 dodge spirit they are 15 22 24 37 and 51

dont know what motor you have so here's all the possible engines

15 .... Vechicle speed distance sensor
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24 .... Throttle Position Sensor
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1 Answer

My cooling fan will not turn off and it kills my battery

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