Question about 2001 GMC Jimmy
Good Evening, I am assuming you have the automatic climate control. Behind your glovebox and on top to the left past a vacuum ball switch is the blend door motor, very common and if you remove it 5.5mm bolts you can manually switch it over and be sure that works, autozone can order those in at a decent price. Hope this helps.
Posted on Oct 01, 2010
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Posted on Jan 02, 2017
working on 4 and 5 speed that the resistor that broken cold air you got to move the selector to see the motor that move the trap hot and cold sometime when the motor was not move to the hot side for a long time its jam the motor on the passager side under dash put to hot and gently tap the motor tanks pierre
Posted on Nov 09, 2008
It appears we have an Air lock scenario and you will need to perform a system Bleed.
Park the vehicle on level ground, when cold remove coolant filler cap, start engine and leave to idle, turn heater on full and blower to max. When engine reaches operating temperature watch and listen near coolant filler, keep clear as gurgling and hopefully a boil over should occur. Top up with very warm coolant and wait as it may do it again.
Check for heat inside vehicle if warm replace coolant cap but keep an eye on temperature gauge as the ~Air lock may have moved on from heater matrix/core so proceedure needs to be carried out again from COLD.
If persistent boil ups/over attention must made in the cylinder head
or gasket area, or possibly water pump?
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Posted on Mar 01, 2009
SOURCE: Heater only blows cold air
Check both heater hoses under hood to see if they get hot, if they do the heater is fine. need to check to see if the selection doors inside the unit are opening and closing.
Posted on Dec 01, 2008
Its more then likely the temp door broken or temp door motor broken/stuck. There is 2-3 of these motors under the dash on the side of the evap/heater core box. Some require extensive labor to replace, good luck
Posted on Jul 29, 2009
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