2007 Chevrolet Silverado 3500 Questions

All 2007 Chevrolet Silverado 3500 Questions

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The blower works but no warm air. Checked the coolant and is ok. Passenger side always had problems with warm air blowing when AC on. What could my problem be? Maybe the thermostat? How can the thermostat be checked...
Terminals clean. Twice the security alarm has went off at 2am. Vehicle was unlocked. Bottom seat heaters have quit. All problems about 6 months ago.
Not sure if these are all related the heated seats light up when you push the button for one second then go out immediately
Ujoints are good . Play seems to be in one end or other
While in wet muddy pasture, there was a loud noise and jerking of steering wheel and brakes. Turning either way is noisy and jerky. Going straight not as bad. Is this possibly a power steering pump or motor mounts?