Abstract: Heat blocker system and methods are provided for preventing heat flow into the passenger compartment (118) of a vehicle (10) to reduce a heat buildup therein. A hole (12) may be formed in the door jamb region (16) or other convenient place that is not visible. A tubular insertion member (66) may then be inserted through the hole (12) to an exterior panel cavity (26). Insulation material (68), such as liquid polyurethane resin or other suitable materials, is injected into the panel cavity (26) and allowed to expand and harden. The hole (12) is then anodized or otherwise cleaned. A plug (62 or 64) may be used to cover the hole (12). The type of plug chosen depends on the location of the hole. A heat reflective cover (110) is secured on the exterior surface (112) of the windshield (114) to prevent heat from entering through the windshield (114). The cover (110) has a heat reflective coating (116) such as a metallic silver coating.