Vacuum question

SuperDad

Registered User
Could a vacuum leak cause major problems? My fan selector on the dashboard is stuck on defrost, fan speed works OK, I just can't get it to move off of defrost. After checking other posts, I believe that's a vac leak. Now, my temp guage is acting squirly, fluctuating up & down, the car is running really rough & my lights flicker at idle. Could they all be related?Thanks
 
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