Rumbling sound, feel vibration from radiator area when car warms up, no overheat

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Was driving car on freeway, it was 107 degrees that day..turned car off and when i restarted it it was mking a rumbling noise coming from the area of where the raditor is located..could feel vibration in drivers seat..car drove fine..no stalling or overheating but vibrating and rumbling continued while driving..cars fine when first started but when it warms up the rumbling vibrating starts..its not real loud but can be heard from outside then next day stopped blowing cold air..tryed putting freon but condenser wouldnt tk it. When i first heard rumbling sound i thought id pulled up to far over front curb and fan was being pushed slightly against something, that wasnt the case but thats what it sounded like..thank you