Question about 1997 GMC Sierra

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Heater blow air its luke warm on the passenger side and some what cooler on the drive side just not blowing hot all the time?

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  • 4 Answers

Check your coolant level first low coolant can cause bad heat and check heater core to see if its cloged. i ussaly push water threw each side with garden hose.

Posted on Jan 04, 2014

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6ya6ya
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Posted on Jan 02, 2017

  • 400 Answers

SOURCE: Changed batteries and climate control not working properly

The actuator has gone bad. They can be programed, and reset, but usaly they are bad, and that will only patch the problem for a while.

Posted on Jun 19, 2009

Mr BrokRench
  • 1623 Answers

SOURCE: 2005 Yukon Denalli - Blow cold air out the drivers side

the passenger side electronic controller is sensing the passenger side temperature is cooler than it really is, which causes the controller to increase the hot water flow to warm up the passenger area...any time you replace a battery or loose your charge, the HVAC module will need to be reset...Try this...
Remove your hvac fuse for 10 sec - reinstall fuse. Start engine "DO NOT TOUCH ANYTHING FOR 3 MINUTES" Recalibration of module will accure when power is lost (fuse pulled, battery changed or died) If hvac reset did not work you have a trouble code - reset BCM There are two ways to reset your body control module Go to the GENERAL Remove BOTH battery cables (for the sake of CAUTION remove air bag fuse and wait 5 MINUTES) Hold both cables together for 1 minute - drains KAM (keep alive memory). Put everything back together Start the engine "DO NOT TOUCH ANYTHING FOR 3 MINUTES" If you have no broken parts - system not default (normal operation)

If that works it just saved you 600 dollars...dealer costs to repair.

Good Luck...please rate me a fixya.

Posted on Jul 25, 2009

  • 1 Answer

SOURCE: AIR CONDITIONER ONLY BLOWING COLD ON ONE SIDE AFTER DISCONNECTING BATTERY

Turn your AC off. Turn the car off Crank the car turn ac on drivers side to 60 passenger side to 90 press auto wait 1 minute turn AC off (very important) turn car off turn car back on switch driver's side 90 passenger 60 press auto wait one minute turn AC off( very important) turn car off turn car on AC 70 both sides press auto your ac should be blowing cold If not, you have an expensive problem

Posted on Aug 12, 2009

  • 172 Answers

SOURCE: 2005 GMC Sierra 1500 - heater blows, but only cold air

Check coolant level. Check for heat at the heater hose going from water pump to heater core at firewall. Check to see that cable is moving coolant control valve from the closed to open position. Low mileage so it shouldn't be plugged heater core.

Posted on Jan 07, 2010

Testimonial: "You were absolutely correct. Low coolant level. Put in some 50/50 and we're nice and toasty now, but need to find out why coolant was so low. Thanks."

  • 55 Answers

SOURCE: 2002 GMC Envoy..Air works fine out of passenger

blend door actuator needs to be replaced. dual climate controls have one for each side.

Posted on Jul 18, 2010

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http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html

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I'm not sure if there is a control valve which stops the water from going through the heater valve.

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