Thermostat housing cap, which is the proper one? (Page 4/4) theogre FEB 13, 10:16 PM quote Originally posted by wilberto: 1985 Pontiac Fiero Service Manual, Section 6B, page 2, states " A pressure-vent cap is used on the cross-flow radiator to allow a buildup of 103 kPa (15 psi) is irreverent here as is not the radiator cap he replaced a week ago... Patrick FEB 13, 10:29 PM I don't think I've ever seen a thread here with so much confusion involving thermostat housing and radiator caps! It's knee deep in erroneous comments. lol