1998 GMC Savana Van Owner's Manual - Page 251

If your vehicle has a 7.4 liter engine andair conditioning, your vehicle will have a auxiliary engine fanin addition to the belt driven fan. Before closing the hood, be sure all the filler caps are on properly. Then lift the hood to relieve pressure on the hood prop. Remove the hood prop from theslot in the hood and return the prop to its retainer. Then justlet the hood down and close itfirmly. Tampering With Noise Control System Prohibited Federal law prohibits the following acts or the causing thereof: Noise Control System The following information relates to compliance with Federal noise emission standards for vehicles with a Gross Vehicle Weight Rating (GVWR) of more than 10,000 lbs. (4 536 kg). The Maintenance Schedule provides information on maintaining the noise control system to minimize degradation of the noise emission control system during the life of your vehicle. The noise control system warranty is given in your Warranty booklet. These standards apply only to vehicles sold in the United States. 1. The removal or rendering inoperative by any person, other than for purposes of maintenance, repair or replacement, of any device or element of design incorporated into any new vehicle for the purpose of noise control, prior to its sale or delivery to the ultimate purchaser or while it is in use; or 2. The use of the vehicle after such device or element of design has been removed or rendered inoperative by any person. Among those acts presumed to constitute tampering are the acts listed below. Insulation: 0 Removal of the noise shields or underhood insulation. Engine: 0 Removal or rendering engine speed governor (if equipped) inoperative so as to allow engine speed to exceed manufacturer specifications. 6-11