Back to the basics...did you turn the hot water shutoff back on? Is it a multi-turn shutoff or a 1/4-turn one? If it was old, and multi-turn, the washer could be shot, and it is all clogged. Try disconnecting the hose and see if you can get any flow into a bucket from the connection.
There could be some crud caught inside of the cartridge, so you might need to remove it and flush it out. Price Pfister single handle sink faucet no hot water
SOURCE: Replacing Cartridge Valve in Kitchen Faucet
A little WD-40 was all it took, although it was quite difficult to remove using lock wrench pliars.
SOURCE: Low hot water pressure on newly installed kitchen faucet
it souns like a factory flaw in the piping or whoever hooked it up, over bent or kinked the line
SOURCE: I have two brand new Price Pfister 042-VGCC
MOST LIKELY YOU HAVE A CLOG AT THE SEAT ON THE INSIDE OF THE FAUCET, TYPICALLY SAND, PEBBLES, OR PIPE SEALANT. TURN THE WATER OFF, UN-SCREW THE HANDLE, REMOVE THE SET SCREW LOCATED INSIDE THE HANDLE BODY, PULL THE HANDLE BODY UP, LOOSEN THE NUT, REMOVE THE SEATS AND STEM AND UN-CLOG THEM.
SOURCE: i have a two handled price pfister kitchen faucet
probably the diverter, order from mfg & replace or you can disassemble diverter and replace internal white part and O ring which is what I did and worked great
SOURCE: Price Pfister hot water runs slow
Check the supply line and valve to see if any dirt or foreign.matter got into the line or valve when you changed out your faucet. if this is not the problem you may have a faulty faucet. You may be able to back flush the faucet with a garden hose by leaving the hot side open, but you will get wet. If you used Teflon tape on the supply line and it is a compression fitting, some of the tape could be blocking the water. for more info go to waterheaterflush.com
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