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overheating...power to fan isn't strong. faulty gauge or bad groud somewhere?

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Old Aug 14, 2010 | 04:07 PM
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Default overheating...power to fan isn't strong. faulty gauge or bad groud somewhere?

SOLVED: cause was the wire tuck. there are two electrical harness grounds behind each headlight that need to be bolted to the frame. This caused the temp gauge misaccurate reading, the fan to run at partial speed, and teh turn signal and hazard lights to dim when the fog lights were on.

noone ever mentions these as "grounds" as they are not so much battery or engine grounds but are specific to the car's internal electric.

Fan is turning on, and bottom hose is getting hot. Fan not on full blast.

Check all grounds: valve cover to frame, valve cover to engine mount, tranny, thermostat, battery to frame.

Car shows that it is overheating on the gauge, even if i have the heater on full blast. The air from the heater feels hot, but not any hotter then what i remember. Coolant is not boiling.

I tried bleeding the coolant and made sure all the air bubbles were out.

when i turn the car on accessory i can see the fan is running (since car is still hot) but not as strong as it use to. To be sure i plugged in a second fan i had and it did the same thing. then if i wire the fan to the battery it kicks on full blast like i remember.

I am wondering ig there is a ground that is causing this electrical issue with the fan as well as the reading on the temp gauge.

Insight please

Last edited by oranginal; Aug 16, 2010 at 04:28 PM.
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Old Aug 14, 2010 | 05:39 PM
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Default Re: overheating...power to fan isn't strong. faulty gauge or bad groud somewhere?

There's probably too much corrosions at the connectors and ground connection points. Try to find what you can and clean them off and see if it'll help some; since, there's high internal resistance in the circuit.
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Old Aug 14, 2010 | 07:27 PM
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Default Re: overheating...power to fan isn't strong. faulty gauge or bad groud somewhere?

checked all ground and their doesn't appear to be any corrosion.

I should also mention this is after an engine swap, if that has any relevance.

even when on the highway it continues to show overheat. i thought the constant air would help, that's why i think the issue is both the fan and some how the a ground.

Also doesn't the car throw a CEL when the ECT (or is it ETC) sensor reads like 250?

any thing i can check to pinpoint the issue, like tracing any electrical wiring?
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Old Aug 16, 2010 | 08:29 AM
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Default Re: overheating...power to fan isn't strong. faulty gauge or bad groud somewhere?

anyone have experience with a wire tuck and the ground on the white box that is behind each headlight?

Could this be the issue. I think i unbolted and just hung it inside the fender. Here is a pic i foudn online (not mine)
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