I have a 99 Explorer with the 4.0 V-6 motor. It has about 100k miles on it. Today, I stopped at a friends house about a block from my house (so it had not gotten to the normal operating temp.). I left it running, with the A/C on, and after a matter of minutes the motor sped up. It did not sit more than 3 to 5 minutes idling with the A/C on. When I got into the Explorer it lacked about 1/4" from being to the red line. With the outside temp at about 100 degrees, I figured it would cool off after I drove a few blocks. WRONG The gauge never went any higher. I brought my Explorer back home, and after letting it cool off, I started to drive around the block. Same problem. I did turn the heater on full blast, and it brought the temp down. Any suggestions would be DEEPLY APPRECIATED Thanks, Barbara
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