luseboy Posted November 29, 2017 Share Posted November 29, 2017 (edited) Alright so I haven't been on here much lately because I've been busy sorting out all the little issues with my car after getting it on the road. It's been having a weird thing happen where it runs at 150 degrees even though it's got a 180 degree thermostat in it. It also seems to take awhile to warm up. Even still, if I'm sitting in traffic or whatever it will creep up to 205 or so and hold there. I suspected that the thermostat was stuck open, so today I replaced it and tested the old and new thermostats, both of which seemed to work fine although the old one didn't close back up till about 170 degrees while the new one was closed at 178. With the new thermostat it runs at maybe 155-160, slightly warmer, but still too cold. The engine is an L28 (F54/P79), it's got a 240z thermostat housing on it, with a universal 3-core aluminum radiator, dual electric fans (one set to turn on at 185 degrees, the other on a toggle switch), and an auto meter water temp gauge/sender. The sender is tapped into the same location it would be on a stock 240z (right behind the dizzy). One thing I just remembered is that the temp sender is 1/8 NPT while the Z housing is 1/8 BSPT, so there is an adapter between them which makes the sender stick a little further out than it would normally. I'm fairly sure I have the cooling system well bled, but not positive. Anyone have any ideas what else could be causing my car to run cool? Is it possible that the radiator is cooling too well for normal street driving? Does anyone have any experience with temp senders being weird if they're on an adapter? I'm stumped, any other ideas what rabbit hole I should try and crawl into next? I should note too that the temp fan only comes on when the gauge reads over 185, so it seems that the gauge is at least somewhat within the range of accurate. Also I should mention that even when the gauge is at 150 the heater still blows quite warm, just as warm as I would expect in any stock car really. Thanks! Edited November 30, 2017 by luseboy Quote Link to comment Share on other sites More sharing options...
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