engine fading and car is running hot on 2007 Pontiac G6

i install a new fuel pump, engine fading and engine running hot

Asked by for the 2007 Pontiac G6
ck water 1st then coolant flow and fan operation
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i have had a similar problem. flush out the radiator really good. the low flow can in some vehicles can trip a sensor in the computer that reduces the power to the motor to protect from serious damage.
Thanks You for the advise,