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My A/C will blow cold air for a while and then it like the heater gets turned on. It only seems to do this if I have the temp controls set for very cold. If I set it just into the blue section of the temp controls, then it will usually be ok, but if I move the temp controls to about midwau...

My wife drives a 2002 yukon xl and just yesterday her auto headlights quit working, low beams. However, in the morning, she goes out at 8:00 am and starts the car and the low beams are working. Tonight, in the dark, she gets in it and no low beams. She can flip the brights on at any time. I...

I have a brand new LBZ turbo mouth piece with vclamp for sale $65.00 you pay the freight from Dallas, TX. If you are interested send me a PM payment terms can be worked out.

I do not know if this is the correct forum but my engine light came on today. So I pulled the DTC code off, 0678. Can any body tell me what this is and how to remedy this code??:noidea:

I am interested in modifying my stock turbo intake mouth piece. Can any body give me the steps I should follow to remove the mouthpiece?

Well I installed the Amsoil duel bypass system over the week end. Everything is good so far, however, I now hear/feel a humming noise especially at idle, that appears to be coming from the area that the bypass was installed. Everything appears to be working properly so far. Does anybody out...

Can anybody tell me if I should use the Amzoil engine flush when I make the switch to synthetic from the dino oil, and why or why not. My truck was bought used with 58,000 miles and now has about 68,000 on it. I changed the oil last at about 65,000 used Rotella at the last change. Any input...

I will be changing my dino oil out very soon. I will run synthetic Amsoil, but should I run the 5-30 wt or 15-40? I would like to run this oil extended change intervals and from what I have read, the longerthe oil is run the higher the viscosity becomes. Any suggestions?? My sig is what I will...

HELLO ALL, I have what may be another stupid question, My PPE is due in today and I will probably hook it up tonight. The question is that before you hook the programmer up to the OBD port, you are instructed to pull the INFO fuse and the RADIO fuse. Do you have to do this every time you hook...

I have recently got myself a 06 LLY dmax and I am looking for any body who might have tried the Hyperpac out on the dmax. What about the performance? Was it worth the money? Any comments or suggestions would be appreciated!! 2006 CREW CAB 2WD LLY DMAX 58,000 MI Mods: 4" MBRP no cat...

I have maybe a stupid question as I am going to be new to the DMAX world in the very near future. The question is if you start out with 360 hp LBZ and you add a tuner, do you then have the 360 hp plus what wver tune you programmed in to the truck? Example, LBZ w 360 hp with a 80 hp tune, does...

As I am new to the diesel world and looking to buy a duramax truck, I read the specs and see only small differences between the two. I do not see any big differences in the LLY & LBZ. Is major performance difference that the LBZ has been tuned different coming from the factory? If this is true...

Hello to all, I will be new to the diesel world in the next month or so. I am looking for a 06-07 chevy Duramax LBZ, and am intersted in only minor mods like a tuner. I do not think I will be racing and maybe some towing under 10,000 lbs. I am mainly intersted in some performance and fuel...