chaseincats Posted January 17, 2021 Share #1 Posted January 17, 2021 Well this is a new one... I was driving this evening (about 40 degrees out) and my temp gauge passed the half mark which I have never seen it do outside of 100+ degree heat with the AC on. I noticed that when I turned off my cabin heater fan, the temp gauge would drop down to where it normally sits almost immediately (a little below the half-way mark) but rose back up past the half mark when I turned the heater on again. I had a long drive so I had a chance to try this over and over again and that is oddly exactly what's going on here. I played with the temperature slider to see if max hot would change the degree of movement on the coolant temp gauge but it literally is an on/off issue. How is that possible? Link to comment Share on other sites More sharing options...
jonbill Posted January 17, 2021 Share #2 Posted January 17, 2021 must be an electrical problem. Maybe your alternator is over or under charging? Link to comment Share on other sites More sharing options...
chaseincats Posted January 17, 2021 Author Share #3 Posted January 17, 2021 2 minutes ago, jonbill said: must be an electrical problem. Maybe your alternator is over or under charging? I actually was thinking about that, because that happened a year and a half ago and I ended up changing the alternator which solved it. The difference is this time my volt meter is reading a normal charge rate compared to before which I think was around 15v. I'll keep that in mind though next time it happens. Link to comment Share on other sites More sharing options...
siteunseen Posted January 17, 2021 Share #4 Posted January 17, 2021 I had an overcharging alternator in my 240 a few years back. The glass fuses under the radio would get too hot to touch. Maybe you could figure out which fuse associates with the heater fan and give a touch next time? Could be as simple as a new fuse. 1 Link to comment Share on other sites More sharing options...
heyitsrama Posted October 1, 2021 Share #5 Posted October 1, 2021 Ever figure this one out? I used to have the same issue when I had load on the electronics from the fans I was running, i switched to a OEM clutch fan because it scared me. 🙈 Link to comment Share on other sites More sharing options...
chaseincats Posted October 1, 2021 Author Share #6 Posted October 1, 2021 3 hours ago, heyitsrama said: Ever figure this one out? I used to have the same issue when I had load on the electronics from the fans I was running, i switched to a OEM clutch fan because it scared me. 🙈 Yea - my alternator was overcharging the battery causing all sorts of weird electrical gremlins to pop up. After changing it out for a “new” (remanufactured ZX unit which is what was already in there), it was good. Link to comment Share on other sites More sharing options...
dutchzcarguy Posted October 1, 2021 Share #7 Posted October 1, 2021 3 hours ago, heyitsrama said: I had load on the electronics from the fans I was running, i switched to a OEM clutch fan Yeah, most people don't realise that a elec fan to replace a standard mechanical clutch fan needs a lot of juice! Link to comment Share on other sites More sharing options...
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