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Joined: Mon Oct 23rd, 2017
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This happened once about two months ago and I didn't think anything of it. Now it has happened multiple times and I am wondering what is going on.
I have an ultra gauge so I can see the engine temp. It normally goes up to about 220' F. Then will drop back down to about 200' like normal. However what seems to be happening for no reason or randomly is that I see the temp gauge on the cluster start to dip below the middle point and when I start looking at the ultra gauge it drops temp to about 170-180' F. I replaced the OEM thermostat with another OEM thermostat yesterday and it did it again today. This seems to happen more when I turn the AC on to MAX and after about 35-40 minutes I can see the engine temp drop. It doesn't drop below 170' F but I can't remember this ever really happening... This doesn't seem normal to me.
No other sighs or problems just random. I had to stop pretty quickly a few times and almost immediately after that I noticed the temp going down. If I stopped abruptly again the temp would start to go back to normal. I'm wondering if there is something along the lines of wiring but not 100% sure what to check. Some days I can drive and nothing happens and the temp stays normal the entire time. Other times the temp my dip below like the above but then after 20 minutes go back up to normal...
-Nigel
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2001 XLT 2.3L
~NSG~