If I understand correctly, the answer is no, but technically yes. A HARM can not home in on a GPS signal, but like a lot of other munitions, it is capable of being guided by GPS and inertial systems, so technically it can be preprogrammed to a known GPS jamming site, which can be trivially triangulated. The thing is, if the location is known, a cheaper munition, even artillery or cruise missiles could be used to hit it.
As an illustration, the US launched 743 HARMs at Yugoslavia during the war, to destroy only 3 out of 25 SAM batteries - this is not so bad as it looks, a Kub battery is made up of 8 vehicles. Most launches were against suspected SAM sites. In return, the Serbians launched 800 SAMs and downed two planes, including that one famous stealth bomber shootdown.
That said, the US has started developing a new missile two years ago called the SiAW that can track GPS jamming stations by itself.
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