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Bmw x5 heater blows cold

My 5 4.8 only blows cold air, its lpg converted. change the thermostat, chaged the water valve but still cold air. sometimes out of the blue it goes hot and then its boiling hot. 99% of the time it blows cold air.

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  • Expert
  • 188 Answers

Replace the thermostat.

Posted on Oct 21, 2013


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alicantecoli
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SOURCE: 2001 BMW X5 Air Conditioning problem

needs a gas recharge

Posted on Dec 14, 2008

  • 2 Answers

SOURCE: 1992 Jeep Wrangler heater not blowing hot air

How often has the coolant been changed? My only guess is that it hasn't and the hoses and the heater core are plugged up with goo and a flush is needed

Posted on Dec 26, 2008

REDOIL
  • 355 Answers

SOURCE: Ford F-350 7.3L overheating...

WELL IS YOU COOLANT LEVEL RIGHT AND IF SO WHEN TRUCK IS WARMING UP CHECK THE RAD HOSE'S AND SEE IF THE LOWER ONE IS GETING WARM ARE NOT OR IF THE TOP IS COLD BUT I WOULD START WITH THERMOSTAT IT'S SOUNDE LIKE IT IS COUSE FLOW ISUSSE HOPE THIS HELPS BUT IF BOTH HOSE ARE HOT AND YOU TOUCHE HEATER HOSE ONE HOT THE OTHER IS NOT THEN IT COULD BE HEATER CORE ISUSES

Posted on Oct 14, 2009

  • 66 Answers

SOURCE: The heater only blows hot air sometimes

it sounds like a bad blend door motor.these are controlled electrically and not with a cable like older vehicles did.

Posted on Oct 27, 2009

nvannoy
  • 234 Answers

SOURCE: BMW 1995 318i - Car Running Hot

There is a blockage or leak in your cooling system. That may come in a few different forms:
Incorrectly installed thermostat
Water pump not functioning - you may see water dripping from the pump or a stain from the hole under the water pump.
Severely coroded hoses/coolant passages - if the fluid is brown and the inside of the radiator rusty
External leak - you would see fluid on the ground Internal leak - you would see steam/white smoke from the tail pipe or water in the oil (may look like chocolate milk or not), if the oil level is extremely high this would be a good indication
heater core bypassed

Posted on Jan 06, 2010

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The heater is only blowing cold air on my BMW X5


Andy, it sounds to me like your blend door between AC and Heater core is not functioning. Check that you are getting vacuum to the inside of the car thru the firewall from the plastic vacuum reservoir first. If you are, most likely would be at the dash lever/buttons not sending vacuum to said blend doors/flaps.

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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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