To prepare sauce, combine first 9 ingredients (peanut butter through garlic) in a small bowl; stir well with a whisk.
To prepare salad, cook linguine according to package directions, omitting salt and fat. Add carrots and snow peas; let stand 2 minutes. Drain in a colander over a bowl, reserving 1/4 cup cooking liquid. Place pasta mixture, bell pepper, and onions in a large bowl.
Combine peanut sauce and cooking liquid. Pour over pasta mixture; toss well. Serve warm.
Note: Hot chili sauce with garlic can be found in the Asian section of most large supermarkets.