Thump THump - Ford Powerstroke Diesel Forum
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post #1 of 2 Old 09-22-2010, 07:24 AM Thread Starter
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Thump THump

Hey all, 2008 F350 w/ 6.4. When my climate control is on defrost I hear an inconsistent light thump under the dash. Happens every 30-60 seconds or so sometimes longer, sometimes shorter. I can change the climate control and it all works fine. It will go from the floor to defrost or where ever you choose with no problems. It will only make the thump when on defrost however. Any ideas.
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post #2 of 2 Old 09-22-2010, 02:48 PM
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actuator maybe?

2008 F250 SuperDuty FX4 Crew Cab Short bed Silver Metallic Dark Shadow Grey Job 1
Extang Trifecta Bed Cover
Spray in bed liner
High Idle Mod
Second Radiator
Second EGR Valve
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