Strange problems, could be related.
 

I just bought this 2001 Blazer sigged below. I swear I checked out everything to make sure it worked before I bought it, that was last week. Bought it today.

I checked everything because I don't really trust the dealership I bought it from because they have ripped me off before, this is their attempt to make it right. I checked the lights, the wipers, the heater, the A/C, the C/C, the 4wd...... everything.

Today on the way home from the Dealership the CEL came on, the heat only works on max heat (and by that I mean that the fan and the position settings work fine, but the temp control does not matter where it is placed it only puts out max heat) and I can't get the A/C to come on, the light flashes 3 times and goes out, and the wipers only work on high.... and they don't park, they stop wherever you turn the switch off.

I scanned it and I got 3 codes

P0154
P0128
P0154 (it came up twice)

I understand that those are emission codes which is covered under Michigan Lemon law and they have to fix it.

I am wondering since it all happened at once if they could be related like a bad body control module (or the GM equivalent) or if they are separate problems.

I would like to know if these are common problems or if I need to drive this through the dealerships big plate glass showroom and take out several rare and valuable mustangs.

Take it back immediately.

As for the emissions, that's a federal thing covered only for 5 years (or 7, depending on the manufacturer).
But, the dealer still has to provide a vehicle passable for emissions, otherwise they cannot sell it without jepordizing their State license.

No way would I even mess around with it. Let the dealer handle it.
If they make a stink about it (which they shouldn't), contact your state DMV and report the dealership.

My truck's air pump quit a week after I bought it.
I had to pass an emissions test, or the state wouldn't issue my plate transfer.
Took it back to the place I bought it, and they fixed it without a hassle.

several problems with taking it back (and I am not above it)

1- they sold me a Suburban that blew a heater hose, I took it back and they decided it needed new intake gaskets, when I got it back he CEL was on and less that 100 miles later it spun a bearing. After almost 6 months of fighting they exchanged the Suburban for this 01 Blazer however my contract was extended but I got $4000 for my Suburban (which is what I had in it) and this has a warranty.

2- We don't inspect. I am less worried about the O2 codes than I am about the heater and wipers. I am, however, going to make them fix the codes because Michigan lemon law says they have too and I am mad at them.

3- I am not above taking it back but I am an OTR owner operator and don't want to spend another 6 months fighting with them. It has been a drain on me and caused an Ulcer.

Sounds stressful.
I'd be pretty darn pissed. But I'd still take it back.
Did you at least inform this place what happened? It does all this crap on the way home, first day of driving?

Now maybe this place is crooked, but you should at least have 72 hours in which they have to do something about it. Your time may not allow it, but either you take it back and b1tch, or live with it.

Contact your local Better Business Bureau. See if there's any complaints against this place. I'd b1tch up a storm until the place did something to make it right (or worse yet, put my wife on it).
You shouldn't have to deal with this aggravation.

I don't know your state laws in particular, but I doubt Lemon laws apply that late into a production run (10 years),especially on a used vehicle.
But, if they do, you'll need at least 3 failures of the same item/type to prove it. Hard to do in 1 day. Bad pulse board (on the wipers), and low antifreeze (air bubble in the system or vacuum hose leak) are not major issues. The wiper isuue though is a safety hazard. If they have a State issued license to sell vehicles, this is a violation of there own inspection before sale. Another issue to take up with your DMV.

Aggravating, for sure.
Call them, and tell them what happened. They should at a minimum offer to fix it, no questions asked.

it is a reputable new Ford dealership with a dirty underhanded used car manager. I called them on the way home. They said they don't have to fix the wipers because they work on high..... thats fine. They are trying to tell me that they are not fixing the emission codes but I bought a certified used car and in Michigan the used car lemon law says they have to fix emission issues and any significant problems I experience in 30 days........ it took almost 6 months of fighting to get them to do anything about the Suburban. I am prolly gonna take this back unless the problems are something simple.

My Uncle has a 97 F-150 that used to belong to my dad. My dad sold it to him because it was stuck in 4wd and the power windows quit working along with the gauges and everything else, plus it was throwing emission codes. I did 20 min of internet research, drove 20 miles round trip, spent $50 on a used body control module (I think GM calls it a GEM) and the problems were solved. the root cause was snow melting off the truck and running inside the cab because of a design flaw on the 97-01 cab design.

I tried running a search for all the symptoms together and then again each one separately. I didn't get anything for the wipers and the other brought up posts with useful information but not quite my issue.

I think the heater problem may be a bad resistor in the temperature door circuit because this morning there was a slight burning paper smell..... I worked on circuit boards for 6 years in the Air Force and I know that smell....... thats a board burning at the component level..... but that could also be the wipers..... or is could be a toasted body control module (I think GM calls it a GEM).

As I said above, the wiper problem is the pulse board. Around $30.00 at any major parts store. This is a common problem on GM trucks. The board sits on top of the wiper motor. Easy 15-30 minute job to replace it. Since you have PCB experience, you can take out the existing board, and resolder the the edge connector fingers (which is were the cracking occurs), and if you have through hole radial capacitors on it, resolder them too.

If your heater fan only runs on high speed selection, then the resistor board is shot. This is located in the fan squirrel cage. If the fan runs in all positions, your temperature knob could be the problem. The knob has vacuum lines attached to it. If indeed your problem lies in the temperature control unit, a salvage yard would be a good source for that. But before going into that too much, see the sentences below.

The two codes indicate a problem with the coolent temp sensor, and a bad oxygen sensor. The oxygen sensor is the heated unit (after the catylitic Converter (not cheap).
The coolant sensor thing could be related to either the sensor itself, or air in your cooling system - this could also be why your heater is not working properly. Do you hearing gurgling from behind the dash on the passenger side? What's your recovery tank level? Is the radiator pressurized? (radiator caps are also a problem on these trucks)

Anyway, your biggest problem is the oxygen sensor as I see it.
I'd for sure speak with the Manager of the place you bought the truck at.
Bypass the asshat you actually purchased the truck from. More likely than not, the dude has already been fired - or will be after you complain.

unfortunately he will always have a job there because he sells 2 or 3 new Lincolns a week on top of moving a crap load of used cars.

they said they will fix the 02 sensor.

the coolant level in the recovery tank full and so is the radiator. I also checked it out for signs of leaking. when I test drove it I drove it to Indianapolis and back so I put about 300 miles on it on the test drive.... would have seen evidence of coolant leaks after that but I will burp it just in-case.

thanks for the info on the wipers, I will pull that next week when I have time and inspect it. How difficult is it to get to that temp control unit?