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Overheating help!!!

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Old 03-27-2017, 12:08 PM
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Overheating help!!!

To start, I've looked at and checked all the obvious or I wouldn't be asking. However we all have momentary lapses in genius as well...
ok so it's a 91 camaro rs. It has a bone stock brand new 454. New water pump, new hoses. New 4 core aluminum radiator. I've tried it with and without a thermostat. Basically everything is brand new. Fans are wired to ignition and don't shut off... car gets hot sitting still. Just climbs and climbs I shut it off at 230 and leave the fans run until it starts to cool on the gauge. I'm left guessing at this point. All work was done at a trusted shop with a mechanic who has built a number of cars over the years. I haven't got to drive it since it was assembled and it's starting to kill me! Anything advice or ideas are much appreciated!
Old 03-27-2017, 12:12 PM
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Re: Overheating help!!!

Are you using the factory gauge? If you are I would check an aftermarket one or IR gun.

How hot does it get while driving?
Old 03-27-2017, 12:15 PM
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Re: Overheating help!!!

I'm using an autometer mechanical gauge. And I haven't driven it yet. If it can't just idle and survive I definitely don't wanna risk traffic with it. Gauge is new as well and is reading writhing 5 degrees to the best an ir gun has shown me
Old 03-27-2017, 12:19 PM
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Re: Overheating help!!!

maybe a blown head gasket.
Old 03-27-2017, 12:25 PM
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Re: Overheating help!!!

Checked that. Pressure tested cooling system and held fine. That was my first thought even with a brand new engine
Old 03-27-2017, 12:30 PM
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Re: Overheating help!!!

only other thing I can think of is maybe you are turning the electric fans on to late the the heat cycle. I have my first fan coming on at 160 and 2nd coming on at 180
Old 03-27-2017, 12:35 PM
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Re: Overheating help!!!

Fans wired to ignition they come on as soon as the key is turned on and run constantly
Old 03-27-2017, 12:54 PM
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Re: Overheating help!!!

one last thought make sure your radiator over flow is hooked up and has coolant in it, the radiator fill is below the thermostat housing and will have air in the system without it.
Old 03-27-2017, 02:22 PM
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Re: Overheating help!!!

Yeah checked that. Like I said I'm pulling my hair out on this one
Old 03-27-2017, 02:31 PM
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Re: Overheating help!!!

Are the fans blowing the correct direction?
Old 03-27-2017, 02:39 PM
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Re: Overheating help!!!

Now there is something I haven't checked, you wouldn't think just idling it would make that much of a difference, but I suppose that's why they make them that way... I'll check that.
Old 03-27-2017, 02:40 PM
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Re: Overheating help!!!

Some setups have to be either push or pull and wont work the other way. I am also just taking shots in the dark here.

Last edited by midias; 03-27-2017 at 02:44 PM.
Old 03-27-2017, 11:06 PM
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Re: Overheating help!!!

something else you may want to consider is a tranny cooler, and as mentioned above fan direction is big a piece of paper will tell you if you are pushing or pulling seems like I remember making this mistake before
Old 03-28-2017, 07:23 AM
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Re: Overheating help!!!

Probably should have said it was a manual tranny... but I will have to make sure the fan is going the right way. Sadly I only get to visit the car on the weekends...
Old 03-28-2017, 08:20 AM
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Re: Overheating help!!!

Do you have the correct rotation water pump?
Old 04-03-2017, 08:30 AM
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Re: Overheating help!!!

Yes water pump rotation is correct... had a thought maybe I'm wrong. If there is no thermostat in it, and the factory bypass hose is hooked up from the water pump to the intake manifold.... would it just be cycling the majority of the coolant there and not actually running through the whole system... any thoughts on that?
Old 04-04-2017, 02:18 AM
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Re: Overheating help!!!

Does the cooling system pressurize?
Old 04-04-2017, 08:23 AM
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Re: Overheating help!!!

The other guy had the fan rotation backwards.
Old 04-04-2017, 09:19 AM
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Re: Overheating help!!!

Take some pictures of your setup and post them
Old 04-04-2017, 11:14 AM
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Re: Overheating help!!!

Originally Posted by Displacedrs
Yes water pump rotation is correct... had a thought maybe I'm wrong. If there is no thermostat in it, and the factory bypass hose is hooked up from the water pump to the intake manifold.... would it just be cycling the majority of the coolant there and not actually running through the whole system... any thoughts on that?
ive never seen it run this way before, always when not running a heater core that passage has been plugged and blocked off. seems to me if ran the way you are explaining it would be recirculating hot water to the top side of the motor id try blocking it off you can pick up some aluminum plugs from auto parts store or brass from hardware depending on your preference Id use aluminum with aluminum.




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