Question about 2001 GMC Jimmy

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Heater only blows cold Not switching controls

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  • Tim Gladden
    Tim Gladden Dec 14, 2012

    it only blows out hot

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2 Answers

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  • 1 Answer

Common problem heater core is clogged remove hose and flush both ways with low garden hose pressure

Posted on Nov 17, 2010

  • softtail1334 Nov 18, 2010

    Thanks very much. That was the problem. When I changed antifreeze and flushed the system it must have clogged the radiator. Thanks again

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  • Master
  • 432 Answers

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

Testimonial: "That is exactly what I wanted to know. Thanks very much"

  • Stephen Hawkings
    Stephen Hawkings Oct 01, 2010

    Try asserting some force to the switch that turns on the hot air maybe it will click over and work hopes this helps rate high please. And also "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." By : cjkelly025 was completely wrong.

  • cjkelly025 Oct 02, 2010

    Glad I was able to help. Any more questions on it just let me know, it is a rather common replacement part.

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6 Suggested Answers

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Posted on Jan 02, 2017

  • 2039 Answers

SOURCE: Heater blows cold, and fan switch only works on 4 and 5

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

motor1258
  • 6674 Answers

SOURCE: heater blows cold

Have you followed your heater hoses from engine to firewall for possible inline before core?

Posted on Dec 12, 2008

onyeredson
  • 404 Answers

SOURCE: heater only blows cold air but hoses are hot

Hi!
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?
Please press the Blue button to appraise my FREE Efforts, Thank You!
Paul 'W' U.K

Posted on Mar 01, 2009

Bloomingidoi
  • 49 Answers

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

  • 54 Answers

SOURCE: 2004 chevy tahoe, dual climate control, blowing different temps

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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K so I have replaced all of the blend air motors and then also have changed out the thermostat on my 93 gmc sierra and also have changed heater core out and it still blows out cold air I can switch where...


Check to make sure the motors are moving hot to cold. The blinking control panel means it has self diag mode. Google how to get the heater control panel to go into self diag mode and when you get codes goggle them too . Prob bad control panel switch or unit

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My heater costantly blows cold


if your heater constantly blows cold then there is a problem with water circulation I:e the heater has a small radiator like your engine has a large radiator the small heater radiator is called a matrix instead of just cooling the water passing through it like the radiator for your engine it is designed to give heat via a fan that blows through it so when it fills with hot water from the engine bay the blower fan blows through it thus giving heat inside the car if it is blowing cold then there is no water getting to it or the water is low in engine bay or there is a blockage even possibly a leak or quite simply the switch that controls the flaps to give you hot or cold air is stuck in the cold position with out more info and me asking more questions this is the basic idea of how it works
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Heater is blowing cold air 1999 dodge stratus


A heater blowing cold air can be a few things. have all of these things check for proper operation to find the source of the problem.
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5. Make sure that the heater control doors are closing when you switch from hot to cold.
6.Last but not least if the climatic controls are electric it maybe at fault.
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