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24 Valve 2nd Gen Dodge Cummins 98.5-02 Discussion of 24 Valve 5.9 Liter Dodge Cummins Diesels with VP44 Injection Pumps

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ok guys my trucks heat/ac won't switch from defrost when i turn my switch... Is it my plenum.. i haven't really checked out the vacuum lines too much but it is still hooked up over by the dipstick where i've had it come loose before... ... JOIN NOW TO REMOVE TRACER

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Old 05-03-2012, 07:42 PM
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Default Heat/air won't switch from defrost..

ok guys my trucks heat/ac won't switch from defrost when i turn my switch... Is it my plenum.. i haven't really checked out the vacuum lines too much but it is still hooked up over by the dipstick where i've had it come loose before... thanks guys...

1st_gen_puller's Sig:01 2500 cummins, SRW, 6speed, silver, 4x4,white LED cab lights, SB DD 3850, billet in/output, Mag-Hytech pans, Edge comp, SO IP, FASS 150, stealth cover, 5'' Diamond eye TBE, 7'' mitre stack as a tip, BD boost fooler, glowshift pyro, boost, FP guages, Industrial Injections Super 62/80, AFE bladerunner, ARP studs, 125hp edge sticks, don m valve springs, ported polished head, stage 2 AFE intake. Barely pulls herself uphill..
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Old 05-03-2012, 07:47 PM
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mine did the same and it was a vacuum line. so id check again

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Old 05-05-2012, 04:49 PM
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Mine did the same thing, it is a vaccum line in the engine compartment more than likely. Mine was on the fire wall, on the turbo side. But your leak could be anywere... Check all your little black vaccum lines and you'll find it.

Dodgemanstan's Sig:2002 Dodge Cummins 6spd 4-wheel disc, Ext cab, 113,000 miles,75 hp injectors, Really Big Honkin Air Filter (RBHAF), Industrial Injection VP44, Fass Titanium 150gpm LP with 3/8 Fuel lines, Issopro EV Gauges= Boost-Fuel-Pyro, Super Chip on "performance", 4'' turbo back exhaust.
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Old 05-05-2012, 05:25 PM
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As the others stated, you have a vacuum leak. With lack of vacuum, the HVAC defaults to defrost. A very common failure point is the plastic vac line on the cruise control servo. You'll find it under the driver-side battery. Battery acid drips down directly on the line and eats a hole in it. Very hard to see, even when you are looking for it.......

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Last edited by mrclean; 05-05-2012 at 05:28 PM..
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Old 05-08-2012, 07:51 AM
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Alright thanks.. i'll keep looking... wonder if my chiltons would have a vacuum line diagram>???
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