The advice mentor Bill Cowher gave Jets’ Aaron Glenn

Aaron Glenn has spoken this season about his coaching influences and those he has leaned on for advice, from his former coach Bill Parcells to his former boss Dan Campbell.

But another Hall of Fame coach also has become a mentor to Glenn in his first season as a head coach — Bill Cowher.

The former Steelers coach and current CBS broadcaster got to know Glenn a little while he was the defensive coordinator in Detroit.

Cowher would stop by the Lions training center and met Glenn a few times.

When Glenn got the Jets job, Cowher reached out.

Cowher, who went 140-90-1 as a head coach and won a Super Bowl, gave Glenn some advice during training camp.

“The essence of what I said when he was in training camp is: No. 1, make sure you’re involved in all three phases of the game,” Cowher said this week. “You need to be able to delegate, which is the right thing to do because that’s how you were given a chance, but you need to step in at times because this is your team and you’re the final say. You’re the captain of this ship, and you don’t want this ship to go down in the hands of somebody else. I said, make sure you’re involved with all elements, even from the standpoint of the draft, free agency, understand where you are with the cap, what’s available and what you can do and can’t do.

“At the same time, there’s no manuscript to this. So, just understand there are no mistakes in being a first-time head coach. There are just lessons. That’s how you have to look at it, whether it be clock management, whether it be player development, whether it be dealing with a coach. You’re going to have to constantly tweak what you’re doing, and when you stop tweaking, you’ve kind of lost control of the team. You should constantly be tweaking.”

Since the season started, Cowher said he and Glenn text back and forth from time to time.

The Jets are 2-9 and can be officially eliminated from playoff contention this weekend.

Despite the record, Cowher said he sees good signs from Glenn and the Jets.

“I think the inconsistency at the quarterback position has led to some inconsistencies with their football team,” Cowher said. “Some of the things that they’ve done at the trade deadline, he’s kind of rebuilding this team with what they were and where he has to go. I think in the first year, it’s hard. I wouldn’t assess it with wins and losses. I think they’re still playing very hard for him, and I think he’s still assessing where they are as a football team.”

Cowher took over a Steelers team in 1992 that had missed the playoffs in six of the previous seven seasons under the legendary Chuck Noll.

Cowher found immediate success with the Steelers, going to the playoffs in each of his first six seasons.

“My first year as head coach … it can be overwhelming at times,” Cowher said. “You don’t realize all the responsibilities that you have, and you have to understand how you can compartmentalize each one of them. It’s a learning curve you go through. As long as along the way you still have to continue to be you. You’ve had some great coaches. You take little pieces of everybody you watched and how they handled certain circumstances. You learn from those and use those as a kind of template that you can refer to, but you still have to be you. Players can see through if you’re trying to be someone you’re not.”

Cowher said Glenn’s biggest challenge right now is trying to build his program.

“You’re building something,” Cowher said. “You’re building a culture and trying to change a place that right now, he inherited a place that needed a lot of change, and change does not happen quickly.”

Glenn has six games left in his first season, then faces a critical offseason. Cowher believes in Glenn.

“I love [the] guy, loved the way he played,” Cowher said. “He’s a fiery guy. I think the players are playing hard for him. Being in New York and trying to change the culture, this is not an easy place to step in from a media standpoint. But the biggest thing you have to do is, behind those walls and behind those doors, create credibility with your players, with the organization and just take your time. Pick and choose your battles. Understand the mistakes that you made, that they’re lessons that you will learn along the way and just keep tweaking.”