I drive it on a mail route.Had been driving about 4 hours with no problems. When I was stopped at a box, it cut off. Cranked back immediately. Did it twice more within 45 minutes. RPM's seem to be a little higher than normal.
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is there any check engine lights on? also a leak in the vacuum lines will make it jump in and out of over drive. could be a few problems. wish i could help more, sorry. if you have a vacuum leak it would also make you heater controls not work like they should, like if you put it on defrost it will only come out the vents and so on.
It's most likely the "four wheel drive actuator" This is located on the front differential housing. It's cylindrical shaped and has a large hex (about
1-1/4") and two wires coming out of it. Usually they short out and blow the fuse but, I've also seen where they just quit working and sometimes they just get slow to work. The "actuator" has a heating element in it and it warms up, some sort gas, causing it to expand thus engaging the front wheels. In cold weather it may take a minute or so for it to engage, so put in four wheel drive and wait for a bit and see what happens.
my 2000 chevy blazer zr2 4x4 the a/c switch that does 123 and 4,the a/c only works on num 3 setting.ive just replaced the whole a/c sytem and blower relay.it wont work on num 4 at all and when it does it cuts off on its own and then works on setting 3 only?what to do?
Chevy Trucks, Blazers, S10 pickup and the like will vapor lock ecspecially the 2000 models. Do not tighten the gas cap past 1 click. There is a tube that runs from the top of the tank down and this gets hot and collapses or burns in half. We just bought a reinforced rubber tube cut it to lengh and use it instead of part and it's worked grat for 2 years so far.