Does the broken back glass make my iPhone XR overheat?

Hello,

You may wish to read the document If your iPhone, iPad, or iPod touch gets too hot or too cold - Apple Support

While broken glass alone shouldn't cause heating it is possible that the breakage went deeper than just the glass. You should have the phone checked by Apple.

iPhone Repair & Service - Apple Support

Based on your situation, I recommend service.

Service Checklist:

• iPhone service pricing.
• Check AppleCare Coverage.
• Get your iPhone ready for service.

Click ▶︎ Start a Service Request. ⚛️

Need more help?

• Call 1-800-APLCARE. 📞
• International Support. 🌐
• Contact Apple Support. 📝
• Live chat using Messages. 💬

Click ▶︎ Check Repair Status. 🔧