zx2 fan controlled by ac? | Ford Escort Owners Association (FEOA)

zx2 fan controlled by ac?

Discussion in 'Electrical' started by Leviathon133, Jul 11, 2018.

  1. Leviathon133

    Leviathon133 FEOA Member

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    I'm sorry this maybe a stupid question but I have been told 2 different cases..

    98 zx2 escort

    car getting hot at long idle/traffic


    This only happened recently right after I had to change the temp gauge sender and also try and diagnose why my ac clutch wasn't coming on. changed the switch gauge read normal. tried to check the clutch, checked Freon no pressure changed the low ac pressure switch nothing so said forget it ill fix it when I have the funds..

    Well I drove to work the next day, noticed that after a good bit of driving and getting stuck in traffic, my temp crept up, if I drove I was ok, but idle it wanted to overheat. I did check the top radiator hose and it was firm, even though I changed the thermostat with a parts store brand about 11 months ago.

    I was told if the ac clutch isn't kicking on then the fan wont work, I don't see how that is if there is a switch for the fan on top of the thermostat housing......but please someone tell me if I'm wrong.
  2. pextor

    pextor Moderator Staff Member

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    There are two fan speeds. Low speed is just for cooling the engine (like sitting in traffic) and high speed is for air conditioning.
    4cylinder likes this.
  3. denisond3

    denisond3 Moderator Staff Member

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    If the a.c. system is not working (due to being discharged for instance), then the computer wont turn the a. c.c system on, nor run the fan on high. But the computer should turn the fan on its low speed, when the water temp gauge is reading noticeably above the normal reading when you are driving along.
    At least once a year I let my Escorts (I won more than one) sit idling in the driveway, to check that the fan comes on when the engine gets hots enough. This is typically when the temp gauge needle is pointing to the "L" in normal or slightly past that point. Then the fan runs for a couple of minutes, bringing the temp down closer to a normal 'driving along' reading. Then the fan cycles off and turns on again in maybe 5 more minutes of idling. This is how it should work anyway.
    4cylinder and zzyzzx like this.
  4. zzyzzx

    zzyzzx FEOA Member

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    The fan should come in when you turn on the AC/, but other things can make it turn on as well.
    I.E. - If you want to test your fan, if the A/C is working, you can turn the A/C, and the fan should be on.
  5. denisond3

    denisond3 Moderator Staff Member

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    .Yes..."if the a.c. system is working"...
    Shouldnt the fan come on when you remove the engine coolant sensor connector, from an idling engine? . . ...... regardless of the a.c. system working or not.
    Last edited: Jul 12, 2018
  6. Leviathon133

    Leviathon133 FEOA Member

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    Ok cool thanks guys, ill swap out the thermostat and see where that gets me, as far as the ac is concerned....I have no pressure on the low or high side and it wont take Freon...I can only assume that either the clutch is bad or maybe the whole compressor *I jumped the low pressure switch and the clutch came on...for a second*
    denisond3 likes this.
  7. Leviathon133

    Leviathon133 FEOA Member

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    K update changed the thermostat let it idle....the temp gauge got to almost the line before red..but then the fan kicked in and cooled it down...does it normally go that's high before the fan kicks?
  8. denisond3

    denisond3 Moderator Staff Member

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    I dont know what line you refer to. Over the years Ford made the word "Normal" wider, and the lines spanning below the word "normal" got wider and wider. I have five 2nd gen Escorts, and where the needle gets to before the fan starts up is different on each one. None of them get to the end of the gauge sweep where the red H is, but some get beyond the end of the worn "normal".

    At least once each spring, on a hot day, I let the engine idle, just to see if the fan comes on before I see any steam coming from the rad cap. I let the fan cycle on/off a couple of times.
  9. Leviathon133

    Leviathon133 FEOA Member

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    The line at the H be the one in question. Im sorry if this seems redundant it's just ive changed basically everything that would have to do with it and it's throwing me off some

    Attached Files:

  10. Leviathon133

    Leviathon133 FEOA Member

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    Butttt everyone keeps telling me these 2.0s are different animals
  11. marclar

    marclar Moderator Staff Member

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    doesnt the ccrm control the fan on this application
  12. Gamer92

    Gamer92 FEOA Donator

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    Yes the fan will come on if ECT is unplugged regardless of AC functionality
  13. Gamer92

    Gamer92 FEOA Donator

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    The temp gauge in escorts varies from each car. Could have a bad ground somewhere or the sensor is going bad. Best to use a scan tool to view actual temperature rather than trust gauge. You can get OBD2 adapters on eBay or Amazon for 20 bucks or so and they can do quite a bit. My old car would get to the line before the fan came on.

    Fan doesn’t come on till around 220
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  14. Leviathon133

    Leviathon133 FEOA Member

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    Yup I'll do that. That's good to know it doesn't kick until about 220. I'm also gonna burp the system as I think I didn't as much coolant back as what spilled when I changed the thermostat..

    Solves that, now I just gotta figure out if my ac clutch is bad or my ccrm or the whole damn compressor lol
  15. Gamer92

    Gamer92 FEOA Donator

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    You can use a paper clip on low pressure switch connector to see if ac clutch will turn on
  16. Leviathon133

    Leviathon133 FEOA Member

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    its funny you mention that last night I had some extra time and a piece of wire and connected the 2. it came on for a split second....I don't think it would come on if my WAC relay was bad correct? I have already changed the low pressure switch

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