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Discussion Starter #1
So I think I have come into my first problem on my 08 Titan. Leaving work last night it was about 39 degrees out so I let my truck warm up like usual, once warmed up I started going to the gym and I turned the heat on, it blew nothing but cold air on like the ac was on. I checked everything it was on heat. I figured once I turn off the truck it will reset itself and work like normal. So after I am done at the gym it is about 31* out, after the truck warms up I try the heater again, same thing. I woke up this morning and it is still doing it. Any help or suggestions on how to fix this? Sorry about the long post.
 

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Turn the the temperature knob to cold, leave it there for a minute or two and then turn it back to hot. Does it make a popping noise inside the dash? If so its the actuator that switches from hot to cold.
 

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Was it working fine one day and the next just quit? If so it happened to me also not sure if it was the same problem though, the heater inlet hose collapsed, Don’t know where to look but that is what the dealer told me, took them 4 day to get the part in to fix it.
 

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Discussion Starter #4
Yeah it was working great that morning, then I went to get in it that night and it was just blowing cold air. I guess I will take it into the dealer in the morning, hopefully its nothing major. I tried turning the cold air on for a couple of minutes then the heat but that didnt work. Thanks for the suggestions and help.
 

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Slight515 said:
Yeah it was working great that morning, then I went to get in it that night and it was just blowing cold air. I guess I will take it into the dealer in the morning, hopefully its nothing major. I tried turning the cold air on for a couple of minutes then the heat but that didnt work. Thanks for the suggestions and help.
Yeah when mine quit working if I turned it to cold then to hot it would make a loud pop noise. It turned out to be the actuator inside the dash and they had to take out the whole dash to replace it.
 

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Discussion Starter #6
Yeah I am really not looking forward to bringing it in if thats the case. How long did it take them to get it fixed? Did they give you a lender car?
 

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Slight515 said:
Yeah I am really not looking forward to bringing it in if thats the case. How long did it take them to get it fixed? Did they give you a lender car?
took about 2 months lol. I had to bring it in 6 or 7 times to get it fixed. The first 2 times they kept telling me nothing was wrong, I got a thermometer that goes in the vent and it was blowing at 80 degrees right inside the vent. I tested my coworkers titan and his was blowing out at 140 degrees. I went back in and raised hell and they finally quit trying to tell me I was making stuff up. They changed a couple easy to get to parts and that didnt help. Once they finally figured out that it was the actuator in the dash they had the truck for 5 days I think, but that was because they had to order the part and just kept the truck while while they were waiting. The first few time I didnt get a loaner, once they figured out they had to take the whole dash out and keep it for a while I was given a loaner.
 

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Discussion Starter #8
Mine was the heater control unit is what they said, which I am guessing is basically the actuator. Of course they didnt have parts so I have another appointment on monday for them to get it fixed. Hopefully everything goes good so I can actually be warm in my brand new truck.
 

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My heater control unit failed as well and had all the symptoms you describe. It took 5 days to get the part. It is under the hood near the fire wall in the middle. All works well now.
 

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Experiencing the same problem with my truck , but can make heater work by not turning heater knob all the way to the full heat position . If I turn the heater knob all the way I can hear the air door moving until there is a load "pop" , then blows cold . Know there is a problem but hate the thought of leaving my truck @ the dealer for an extended stay .
 

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So I assume this is a very common problem? My heater doesn't work either. Seems ridiculous to have a problem like this on an '07
 

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Same here...goin to the Dealer tomorrow morning...this sucks...Ive been a FORD driver my entire life...got me a Titan...week later...no HEAT!!!! damnit....still love the truck though haha
 

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I solved my heater problem!

Bought a new NISMO radiator cap.

So far, I get close to instant heat or within a minute of start up at 45-47 degrees outside.

If that didn't work, I was going to check the heater core, get a pressure test, and see if anything was blocking the flow of fluid.

$35...
 

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Having the same problem with my Titan. Heard more of a click in dash before it began blowing cold air. Dealer replacing entire heater box which means the whole dash has to come out. Has been there for 4 days good luck.
 

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I've had my Titan a little over a week......Same Thing. Blowing cold air for several miles, mess with the controller, and then, wahlaa, HEAT. I really don't want to leave it at the dealer. :crying:
 

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fpd7 said:
I've had my Titan a little over a week......Same Thing. Blowing cold air for several miles, mess with the controller, and then, wahlaa, HEAT. I really don't want to leave it at the dealer. :crying:
1. If this is the case, check your fluid level to make sure that it's full.
2. If you mess with the heater control and then later, it goes hot, it can be because of a faulty radiator cap...
 

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Thanks, I'll try that. I find it hard to believe it's low on coolant, but I'll check it out tomorrow.
 

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Discussion Starter #19
So mine was fixed for a while now (while the weather was nice) now that it was cold today of course my heater stoped working again. All it does is blow cold air... Again. Taking it to the dealer in the morning, this is getting rediculous less than 5,500 miles on my 08 and ive been to the dealer close to 10 times trying to get my heater worked out and I also have a vibration sounds like a heat shield they cant figure out.
 

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Hey, So what ever happened to get this heater, or lack there of, fixed? I currently have the same problem and the actautor has been replaced 3 times! The first time was under the 3/36 and then under the 1yr warranty for the part and the third time about a week ago the actuator again under the 1 yr for the second replacement and this time they also tell me the A/C control unit has an internal short and that that's what has caused the actuators to quit all 3 times and that I have to pay $460 parts and labor to replace! After raising hell that if that was the case it should have been covered from the get go, they relented and covered it. But now a week later, guess what? No heat! It seems like it starts blowing warm but then goes cool. What the ?? I'm reluctant to take it back since they pull the dash out every time and keep it for 3-5 days and I only got a loaner the first time. I don't think know what they're doing. I've seen alot of the other posts on this so I wonder if Nissan is aware of a fix and has put out a TSB. Other than the brakes this is the only real issue I've had but this is an '04 with only 24k miles so I guess it'll be the rear axle next from what I've read and heard. Thanks!! Rob
 
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