after your form, where you call the first function, "sendMailToAdmin()" I think you just need to call the other 2 functions as well and you should be all set, something like:
if(
sendEmailToAdmin($make, $model,$isSetupHelpReqd) // call the first function
)
{
$boolMailSent = true;
}else{
$boolMailSent = false;
}
sendEmailToSupport($make, $model,$isSetupHelpReqd); // call the second function
it occurs to me that both functions have the line "require("scripts/phpmailer/class.phpmailer.php");"
calling it a second time in the second function may error out, you might want to change that to require_once().