95 v6 cooling system issues. - Ford Mustang Forum
 
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post #1 of 6 (permalink) Old 03-05-2011 Thread Starter
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95 v6 cooling system issues.

Hello new member here. I just purchased my first mustang its a 95 v6 3.8L manual, completely stock. I cannot find a solution to my problem, i have been online for two days reading forums and am now desperate, so here it goes.
The solution search started with me noticing that my temp gauge does not work needle will not move at all and is stuck at C i have checked my fuses and they are all good. I then noticed that my coolant spillover tank was bone dry (radiator was full) i did a coolant fill following all the steps in my haynes manual and found that coolant is flowing (the upper hose got hot) there are no leaks and the coolant i could see in the radiator looked clean. In this process i noticed that my cooling fan would not turn on, i left the car at idle for a good twenty minutes so i assume the engine got hot enough to trigger it. also check engine light is on. car runs great and does not show signs of overheating.
I would like to know what the possible causes are for these my guess from what i have been reading would be Coolant temp sensor, PCM, CCRM, and maybe the thermostat i do not know what or where the PCM is there is no explanation in my manual and cant find any specifics online as to where it is. Is there anything else i should check out and how do i test these? can any of these cause these problems alone or is it most likely a combination of more than one. I need to know where to start or if i am even headed in the right direction.
Thanks much
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post #2 of 6 (permalink) Old 03-05-2011
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the cts (coolent temp sensor) will pop a code on your dash. you should pull a wire diagram up and see where it feeds. the sensor could test good. but the wire is bad. a garage will beable to lock on the cts and see what its reading while the cars running.

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post #3 of 6 (permalink) Old 03-06-2011 Thread Starter
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Thank you for the reply but im not quite sure what a garage is in auto tech terms.
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post #4 of 6 (permalink) Old 03-06-2011 Thread Starter
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Oh and i forgot.. the A/C compressor is seized and no longer connected i dont know if that would cause the cooling fan to not work or the temp gauge either but that would throw a check engine light wouldnt it? and the heater works just fine as well
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post #5 of 6 (permalink) Old 03-06-2011
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some autopart stores will hook up their scan tool to your car and tell you your trouble codes.... start their

35th Anni. Laser Red 3.8 coupe
ET: 1/8-9.892 @71.57 ET: 1/4-15.452 @88.06
4.6 60' 2.195 ET 14.205 MPH 99.44

98 Ranger XLT 4x4 Oxford White 3.0 M/T
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post #6 of 6 (permalink) Old 03-06-2011
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I generally do not answer posts for cars older than 96 because I do not have a set of service manuals.

I will attempt to answer the questions I can.

The PCM is located in the right hand kick panel.

When the AC is off, the cooling fan turns on/off depending upon engine temperature.

I do not know if the 95 model year uses a coolant temperature sensor or a cylinder head temperature sensor (CHT). Why is that important? Because if there is air in the cooling system and a coolant temp sensor is used, the sensor will read low. Why? Because the sensor is in contact with air instead of water.

This should be high on your list since you reported the dash temperature guage reads low.

The V6 is prone to air being trapped in the engine. The V6 will overheat if the coolant refilling procedures are not followed.

In later model years, Ford switched to the cylinder head temperature sensor to avoid issues with the sensor reading low under certain conditions.

In response to comments about a bad temperature sensor thowing a DTC code, be careful here. The 95 MY is not a true ODB2 PCM. It may not behave the same as latter MY cars based on a full ODB2 PCM.

My recommendations. Start with the basics. Is the cooling system tight? Will it hold pressure? What is the condition of the radiator cap?

Does the head gasket leak? Is it using coolant?

Have the coolant re-fill procedures been followed and all of the air removed from the engine vent? Does the top radiator hose get hard when the motor is hot? Is the top radiator hose full of coolant or air?

It's called a cooling system because there are many parts involved. Each has function to do and some symptoms can have multiple causes. So start with the basics and work up from there. Go where the symptoms lead.

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