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The blower moter switch or the blower moter controler can cause this
problem. Remove the plug from the switch, use a 12v test light to locate
the 12v power wire in the plug. Next with a small jumper wire bring power from the 12v contact to the low and medium speed contacts on
the plug if the blower changes speed replace the switch if it still only
has high replace the controler. The blower controler is located on the
passenger side end of the heat-a/c box near the blower moter.
By the way the key must be in the on position for this test.
I hope this helps. Good luck.
In the fuse block below the inst. panel, there are two fuses for the blower moter, fuse#4 and #5 both are 15amp fuses. If the fuses are
good, pull the yellow/blk wire from the the bl.moter and using a test
wire ground the contact the yel/blk wire came from. If the blower works,
replace the blower resistor assembly. It's located near the blower mtr.
and has 4 wires from it, yel/blk- pnk/blu-brn-grn. Also make sure the key is on and the blower is on when you do these tests.
Hope this helps.
it sounds to me like your blower moter resister or your blower moter switch are going bad both are right under the hood next to the blower moter one has 2 witers on it the other has 4 it usuley on the pass side right near the window