1996 GMC Sonoma Owner's Manual - Page 249

Adding Coolant If you need more coolilnt, add the proper mix nt the coolcmt recajer?! t m k . Add coolant mix at the recovery tank, but be careful not to spill it. You can be burnedif you spill coolanton hot Turning the radiator pressure cap when the engine and radiator are hot can steam and allow scalding liquids toblow out and burn you badly. With the coolant recovery tank, will almost you never have to add coolant the radiator. at Never turn the radiator pressure cap even a little when the engine and radiator are hot. engine parts. Coolant contains ethylene glycol, and itwill burn if the engine parts are hot enough. Don't spill coolant on a hot engine. -- -- 6-27