I'm reasonably mechanical smart but what I'm about to tell seems to make no sense. Can these things somehow be related? I've got a 99 Mazde B3000 ( same as Ranger 3,0 except a little sheet metal bending and badges ) with 125k miles that I've had 7 years and since it had 67k miles. My dad bought it new and I inherited it. Its it great shape. Hard to tell it's almost 20 years old and been maintained very well. Oil changes every ~3k miles, tranny fluid every ~20k or so. But, until last year at about 115k miles it had never had the plugs changed. I think they were supposed to go ~100k but I planned to run them until there was some indication they "needed" changed. Anyway the truck ran super until then although about the same time the light skip started it got to where they air conditioning compressor would intermittently stop compressing for a couple of minutes and allow the air to blow warm for a couple of minutes before it came back on. I had read that may be the solenoid switch and planned to swap it but it always came back on and I never got around to it. Anyway, after about a year of doing this the truck started skipping a little when accelerating. I changed the spark plugs and the skipping went away... and SO DID THE COMPRESSOR ISSUE at the very same time! I figured it was coincidence and that issue might come back but it never did. All was trouble free for a year and then I thought I could detect a slight skip every now and then. Not bad... but it seemed to be there, wasn't as smooth as before. Also, the intermittent compressor stopping returned at about the same time. I decided that if the skip got any worse I'd change the plugs again and since it was hot out the air cutting out was aggravating so I thought I might need to finally swap out that relay and troubleshoot that. ( I never went and found or touched that relay ) Then, just for the heck of it I opened the radiator and it looked low. It took a gallon and a half to fill it up! But it's hot weather and the temp gauge had been operating & reading normal! What could that mean... had I just happened to discover the water was low RIGHT AFTER something had happened? But everything seemed fine... no water in oil, truck ran fine, saw low leaks and after 2 weeks now the water I added is all still there. Radiator is still full. Plus the intermittent light skipping has stopped and the compressor is no longer cutting out. All that occurred right after I filled the radiator up... Can this stuff somehow be related? I can't think of how they could but I thought I'd run it by ya'll. Thanks for reading this long post I appreciate your thoughts. If these can be related I like to understand how.