Car Radiator Cap Remove

Asked by GuruFKKKS Apr 29, 2020 at 08:21 AM about the 1985 Suzuki Alto

Question type: General

since last 3 year I am driving my car suzuki Fx 1980 model, without Radiator
Cap, running perfect heat showing 20% in the month of May, June, July IF I fix
Radiator Cap so heat shows 65% that is why I remove my R/Cap. What happen
if removing the cap to my car engine. Thanks & love u.

1 Answer


The radiator cap causes a pressure rise and their pressure rise makes the boiling point also rise, on a late model car this is a must have thing due to all the electronic controls and the need to reduce emissions the engines run leaner and hotter then ever. On your little car this was not a big deal so they used less pressure but it still needed some to keep the boiling above 212 degrees and for the early emissions working. So running without a radiator cap might cause a drop in fuel mileage. I have also ran a few vehicles without a functioning radiator cap, however I modded the cap by removing the lower seal and grinding off the spring and just using the cap to keep dirt and crud out of the cooling system. I am somewhat confused by your use of percent as a reading, normally it is degree reading, and if everything is working properly the temperature for the thermostat opening should be the same even without a radiator cap, if that is what your asking.

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