A Specialist was the first on scene to help passengers in a car crash. How do I push this to get him recognized?

One would think the appropriate award would be the Soldier's Medal. But, looking at the criteria in AR 600-8-22 and what you described, would not warrant the Soldier's Medal. An Army Achievement Medal or the Army Commendation Medal would be more likely to be awarded. The criteria for the Soldier's Medal is below.

3–15. Soldier’s Medal
a. The SM was established by Act of Congress 2 July 1926 in accordance with 10 USC 7280.
b. EO 13830 authorizes the SECARMY to award the SM to any person of the Armed Forces of the
United States or of a friendly foreign nation who, while serving in any capacity with the Army of the United States, including RC Soldiers not serving in a duty status, as defined in 10 USC 101(d)(1), at the time of the heroic act, distinguished themselves by heroism not involving actual conflict with an enemy.
c. The minimum degree of heroism required is comparable to that of the DFC for heroism. The extraordinary act must have resulted in an accomplishment so exceptional and outstanding as to clearly set the individual apart from their comrades or from other persons in similar circumstances.
d. The heroism must have involved a clearly recognizable personal hazard or danger and the voluntary
risk of life under conditions not involving conflict with an armed enemy.
e. Awards will not be made solely based on saving a life, assisting emergency personnel, or acting as a
good Samaritan.
f. The SM may be awarded for noncombat heroism in a combat zone, or an area designated for imminent danger pay, hostile fire pay, or hazardous duty pay.
(1) Since the SM is only awarded for noncombat heroism, the “V” and “C” devices are not authorized.
(2) This determination must be made solely on the specific circumstances of the event.
(3) If the heroism to be recognized was performed under combat conditions, a decoration for valor is
the appropriate award.
g. If downgraded, an SM recommendation will be downgraded to an ARCOM.
h. All SM award recommendations will be forwarded to the Chief, ADB, HRC for determination.

If all that was really done was call 911, the SM completed a civic duty that barely warrants a certificate of appreciation. We need to be careful that we do not attach awards as an expectation of performing a civic duty.

There's a specific award for that kind of action that you can submit - the Soldier's Medal. You'll need to look at the eligibility criteria though.