Heater blows cold when idiling - Ford Powerstroke Diesel Forum
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post #1 of 6 Old 12-06-2012, 07:48 AM Thread Starter
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Heater blows cold when idiling

I purchased a 2006 F250 6.0 powerstroke with 12k on original motor. Noticed today that my heater is blowing cold when idiling but blows hot when driving. Any advice here for what I should be looking for or concerned with.
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post #2 of 6 Old 12-06-2012, 07:55 AM
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first and easiest check is to make sure your coolant level is topped off high enough.

03 F350 6.0 SRW 4X4 lariat

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post #3 of 6 Old 12-06-2012, 08:09 AM
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Or your heater core might be clogged. I think mine is and going to flush cooling system before it gets cold.

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post #4 of 6 Old 12-06-2012, 09:21 AM
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Take a look at the heater control valve on top of pass valve cover and make sure its opening completely. Look at it to make sure its fully opening and closing

2006 F250 LARIAT CCSB 4X4
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All riding on some Fatty-Daddy 38/15.50/18 Toyo's
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post #5 of 6 Old 12-08-2012, 08:37 AM
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since the problem is at idle only, as mentioned, more than likely a clogged heater core. can try back flushing. sometimes it works. if not, it would need to be replaced

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post #6 of 6 Old 12-11-2012, 03:48 PM
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my 04 has done it for the last 50,000 miles. no heat at idle. rev it to 1200 rpm and the heat would blow hot. i vc9 flushed it. and replaced the thermostat and water pump. still no heat. i have read on the forums that this is a sign of a bad head gasket. i just refused to believe that since my truck was running good and my coolant level never seemed to change.....much. well at 199,000 miles i just got my truck back from the shop yesterday with new head studs installed. it started to feel low on power up the hills and the degas bottle started showing a black slime inside. now my heater kicks out the heat at idle. no more of using gallons of washer fluid to defrost my windshield in the morning. i hope this is not your case. but just thought i'd tell you my story from the past few days. good luck
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