94 sho atx wont heat up

[mclark]

My 94 3.2 atx sho wont heat up.i changed the t-stat(motorcraft) and temp sender twice and replaced fan relay module, problem not solved.temp gauge never passes l on [normal] at highway speeds. In stop and go traffic never passes the a. I have let car ilde for long periods of time and fans will come on when the gauge reaches the a and fans shuts off at the m. With a/c on max gauge stays b/t the a and l. New rad and cap, all this done in last four months. Please help, this problem is also killing my gas mileage.

 

[bubba]

did you put the t-stat in right? Put the codes and see what you come up with. Could be a ccrm acting up

 

[projectSHO89]

If it indicates within the range of "N O R M A L" , the temperature is NORMAL!

Other than that, you need an external thermometer to MEASURE the actual temperature. Otherwise, you will drive yourself crazy and waste your time and ours.

 

[rubydist]

sounds like it is working just like it should to me.......

 

[mclark]

I did replace t-stat & was put in correct,check engine light is not on but does work.i also replaced the ccrm two days ago but no fix to the problem.temp might show normal but my fuel mileage is way low. Will any type of ground connection have any thing to do with it.

 

[Operation SHO]

Check ur egr for gunk

 

[hawkeye18]

I did replace t-stat & was put in correct,check engine light is not on but does work.i also replaced the ccrm two days ago but no fix to the problem.temp might show normal but my fuel mileage is way low. Will any type of ground connection have any thing to do with it.

You might have noticed as you replaced the temp sender for the dash (I assume you're not actually replacing the EEC temp sender...) that it only had one pin on it. All electrical circuits need a positive and a negative to work, so the temp sender grounds through the block itself. Thus, if the engine block has a poor ground, this might be causing issues.

What kind of MPG are you getting? Do you drive mostly city? If you do, O2s can get old and not work as well without setting a CEL, and it will most assuredly destroy your mileage.

 

[mclark]

EEC TEMP SENDER HAS BEEN REPLACED AS WELL.I READ A THREAD ON YESTERDAY ABOUT GROUNDING.WHERE EXACTLY TO LOOK FOR THESE GROUNDS IF MORE THAN ONE.THE O2s ARE GOOD.FUEL MILEAGE DROPPED WHEN TEMP PROBLEM STARTED.

 

[mclark]

As you can see i am from mississippi,my local ford dealers wont touch this car.so i get all my info from other sites and doug lewis if he is not busy.

 

[projectSHO89]

Without an independent measurement such as one taken by an IR thermometer, you're really wasting your time and ours.

 

[hawkeye18]

EEC TEMP SENDER HAS BEEN REPLACED AS WELL.I READ A THREAD ON YESTERDAY ABOUT GROUNDING.WHERE EXACTLY TO LOOK FOR THESE GROUNDS IF MORE THAN ONE.THE O2s ARE GOOD.FUEL MILEAGE DROPPED WHEN TEMP PROBLEM STARTED.

Even with cruise control, you still need to steer.

 

[Eric VerValin]

I'm with project all day... I thought L was a little cold for my SHO, until I put an IR thermometer on the thermostat housing... watched it crawl up to 190, then it dropped..

my "range" there is between M and A on the highside, and runs on the highway at L..

 

[mclark]

hey guys i appreciate your time and effort to help solve my problem,i did make contact with doug lewis who advised the car may be at operating temp,but the temp gauge is reading why to cool.going to try something different and see how it work,will post later after finishing,may be help to others.

 

[frosho]

You had to call Doug Lewis to confirm what everyone's been telling you?

 

[SHOZ123]

You can test the gage by first taking the single wire off the sender. Ground it with the key on, the gage should go H. Apply 12v and it should go to L.

If this does not happen then the problem is in the IC circuits or connection.