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2001 VW Beetle 2.0 heater won t heat up

I have flushed and changed the coolant and put in a new thermostat afterward. The upper radiator hose and all other related hoses are hot with exception to the lower radiator hose that actually runs up to the thermostat. I also flushed/attempted to flush the heater core. Any and all suggestions appreciated.

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  • 46 Answers

If you flushed the coolant with the thermostat in, chances are you didn't flush the coolant. Regardless, it's easiest to check the controls inside first. Does the blower fan work? Does the air flow change from floor to vent, to dash as it's supposed to? Does the A/C change temps when knob is turned from cold to hot? Post results.

Posted on Nov 26, 2013

  • d_aud1970 Nov 26, 2013

    I flushed the cooling system with the old thermostat removed and before installing the new thermostat. The mix flapper was a problem in the past, but is working at this time. The blower is working. With the A/C engaged, the temp goes from cool, with the temp set on hot, to cold, with temp set to cold. The air does blow from the floor, dash, etc. as set.

  • Cody
    Cody Nov 26, 2013

    Ok, so it sounds like you are dealing with a coolant flow issue. Flush and clean system, PROPERLY! Buy a flush kit, drain system, blow compressed air through, fill with cleaner/water mix, run for 30 min with heat on, drain system, blow out with compressed air, fill with water, run for 30 min, drain, blow out with compressed air, fill with 60% coolant mix. I would also absolutely disconnect heater core hoses and blow compressed air through there every time separately. Better to do it once the long way than never get it right.

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