a suitable conformal coating although the principal purpose of the chamber 52 is as a heat shield from the higher temperature of the engine block 12 u2032 heat sinks 78 may extend downward into the chamber 52 and have an upper surface that may abut a lower surface of flexible circuit substrate 64 beneath heat generating components 80 on the circuit substrate 64 in this way heat generated by the components in the enclosed space between conforming cover 76 and the intake manifold assembly 50 may be drawn off by the same cooling fluid that blocks heat transmission from the block 12 u2032 referring now to fig4 the present invention may be used with electronics mounted near other engine components for example a transmission 82 in this case temperature sensitive circuit components 88 can be held in a transmission sump 84 held beneath a cover 86 at the bottom of the transmission 82 the temperature sensitive circuit components 88 are protected from heat by heat shielding chamber 90 which receives cooling fluid 92 through an inlet pipe 94 which may then be exhausted through an outlet pipe 96 as heated coolant fluid 98 referring also to fig5 the temperature sensitive circuit components 88 are shielded from the coolant fluid by a double wall enclosure 100 providing for a central pocket 102 positioned beneath a sealable cover 104 isolated from coolant flow in the outer chamber 90 here the coolant fluid may be transmission fluid or the like sealable access ports 105 may allow.