Question about 1999 Chevrolet Suburban
Sounds like the modulator valve on the transmission. get it checked or you may be buying a new transmission soon. it might be as simple as a vaccum leak
Posted on Nov 03, 2012
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Posted on Jan 02, 2017
With coolant full and engine hot,make sure both heater hoses are hot. If not replace thermostat. If they are, check the blend door for proper operation. Otherwise you may have a bad climate control module. Check both front & rear units.
Posted on Jan 27, 2009
it should be under dash next to gas peddle on left end of heater box not that hard 2 screws and a plug. its called heater blend door actuator.
Posted on Jan 28, 2009
SOURCE: After a long drive, especially
The hard shifting you are experiencing is caused by slight wear in the valve body in the transmission. It doesnt mean your tranny is bad though. This hard shift will only usually occur when the transmission temp reaches 93 degrees. So you could rebuild the valve body or sometimes a tranny flush is a temp fix.
Posted on Oct 15, 2010
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