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2007 Suzuki Grand Vitara heater trouble

I had my EGR valve replaced and now my heater is not running right. It will go cold while I’m driving and when I am at a stop light. I’m in Colorado and really need it to run right. I there a possibility that changing the valve can effect the heating system. I was fine before I too it in.

No. They are not connected. With a 12 year old car, stuff just breaks. Usually at inopportune times.

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They may not have properly filled the cooling system after replacing the EGR valve or there could be a coolant leak. Check the coolant level and inspect for leaks.