Can I have two bad thermostats in a row

[Nekkedbob]

I found the problem! All the thremostats that I found did look a little different from what I had. While at the counter at Advance auto a lady behind the counter walked by when I was explaining to the other counter person what was going on. She took over from the first person and ask if it was a late or a early 98 and I told her a late. She pulled both and nether looked like what I had originally had. At that point she pulled one for a 99 and there it was just like I had. Went home and installed it and all is good. Flat road , 85 degrees out with the AC on right at 191, 195 up the steepest hill I can find locally  never below 188.

[AH64ID]

Ah, so they gave you a 12V one. 

 

That explains the proper temps, but easy to get there. 

[Nekkedbob]

I took a pic. and you can see the difference. I thought that maybe a up date or a different manufacturer so I didn't question it. The flow has got to be twice the stock unit. The one on the right is the old one the one on the left is what 2 different parts houses gave me.

[Mopar1973Man]

The one on the left was the old school NAPA I use to get all the time. Now the one on the right is what the new NAPA thermostats look like now. 

 

 

[Nekkedbob]

Both NAPA and Advance gave me the one on right but it was the lady put in 99 and I got the one on the left. The one on the left was the same as the one that was put in it 4 years ago from NAPA in Jackson Ca.

[AH64ID]

Maybe it’s the photo angle, but the one on the right doesn’t look like it will work with the bypass in the motor. It doesn’t look like it has the correct shape to seal it. 

[Mopar1973Man]

The bypass valve part is a bit bigger and tapered slightly for a good seal. They really did change the design quite a bit. 

[AH64ID]

1 hour ago, Mopar1973Man said:

The bypass valve part is a bit bigger and tapered slightly for a good seal. 

 

Any pics of that part of it?

 

1 hour ago, Mopar1973Man said:

 They really did change the design quite a bit. 

 

Who is they? Cummins or aftermarket?

 

I've got a 4 year old Cummins one in mine that is like the one on the left.