Tire Valve problems of the 2002 Ford Windstar

My wife has a minivan that I had the tires replaced on within the past two years. I purchased a set of 4 high quality michelin tires with 75k warranty from sears at fair oaks mall in fairfax, va. Earlier this year my wife had a blow out and I took the vehicle back to sears for them to inspect the tire. Once they removed the tire there was no indication of a puncture anywhere on the tread or sidewall - I was a tire repair technician back when I was in college. I asked the technician why the tire would have blown if there was not a puncture, he didn't have an explanation. I asked if that should be covered under the manufacturer warrant and they seemed unwilling to help. I ended up buying another tire for $150. 00. Then just this weekend as I was driving I heard a hissing sound coming from the left front tire. When I got out of the vehicle I noticed the tire was leaking air from the valve stem. I took the tire in to have the valve stem replaced and they mentioned to us there has been a recall on valve stems. I believe the previous incident was also caused by a valve stem issue since there was no other indication of a puncture. I'm planning to have all of the valve stems replaced on the remaining tires so that my wife will not suffer a blow out with our 3 children in the van. I think there needs to be a greater campaign on this issue to increase awareness as it could potentially impact all 4 tires on a vehicle.

I purchased new 4 tires from sears auto center in dulles, va on 1/46/07 which they installed on our 2002 Ford Windstar. My wife, 3 year daughter and myself were traveling on interstate i81on 4/24/08 with this Ford Windstar experienced a front passenger side tire blow out. It was a good thing I was the driver and not my wife as this could of been tragic!! I quickly pulled it on the highways shoulder after traveling at 70 mph. I replaced the blown tire with the temporary spare. We then proceeded to have it replaced. The sears auto center in winchester, va told us they did not carry that exact tire and did not have one with the same speed rating and can not legally install one the doesn't match the rest. We needed to get home to our two children who were coming home from school, therefore, we were forced to purchase two new tires along with fees associated with doing so. We didn't know what caused this tire blow out and the sears technician was baffled as he said he found no holes or puncture in the blown tire. The two front tires are now new and the two rear tires were still in place from the original 4 tire purchase on 1/6/07. On 6/12/2008 we experienced a sudden loss of tire pressure on the passenger side rear tire and the tires valve stem was hissing from a sudden crack that had formed. I had the stem replaced at walmart in front royal, va. On 6/27/08 I had the last of the original tires have a sudden valve stem failure causing instant pressure loss. I was now suspecting the valve stems must have a major flaw and requested that the walmart technician give me the failed valve stem after he replaced it. After I returned home from getting this repaired, I researched on the internet for any tire valve stem recalls and I discovered the tech International recall under your investigation campaign id 08t018000. I have saved this remaining stem with the part number dill-acp tr413 on the base.