How to ID the new thermostats?

[Archive]

Going to buy a new thermostat tomorrow - if someone tells me how to be sure I'm getting the improved model. I searched the archives and didn't find the info. I think I remember someone saying that the proper new thermostat has "aa" imprinted somewhere. Please help!

BTW: Geno's lists: 3935811
Fritz lists: 3943200
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99' Quad 4x4 A/T LB 3. 54 30K Miles.

[This message has been edited by tlippy (edited 07-23-2000). ]

 

[Archive]

The new thermostat # is 05015090AA.

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White 99 3500, QC, 3:55, auto. most options except leather, Line-X bed liner, fiberglass running boards Rancho 9000s, bug shield and window vents, black vented 5th wheel tailgate, 100 gal. aux. fuel tank.

 

[Archive]

The dealer replaced my thermostat with the new improved version, NOW it is only running about 150 or 160 tops. Used to run at 180 and get to 200 on a hill, hard pull with trailer. I think diesels run better, ie, better mileage and power at the higher temps. Wish I could buy my old thermostat back.

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99 3500 QC, white, 5sp, 3. 55lsd, isspro EGT & boost, 40,000 miles 07-15-00- (EX phord owner) 15-16. 5 MPG hwy ,14-15 city , 10-12 with 4,000lb TT , 1500 - 3000 in 4th = 13 sec
(added VA 2/16/00)1500- 3000 in 4th = 10 sec
removed VA , put in 275 1500 - 3000 4th = 11. 15 sec ,
slight mpg increase both ways.
5/15, VA with 275 , 1500 - 3000 , 9. 0 sec
1 or 2 MPG increase over stock. .

 

[Archive]

I have just had my "defective" original equipment t'stat replaced with the 5015090-AA replacement and my '98 24v sits at a comfortable 180 degrees in the Phoenix summer heat. With the "defective" unit it pegged 190 until I hitched up the TT or flew low across the AZ desert, when it was very twitchy and I'd have to back off the go pedal. So far I have not been able to get it to register more than 1 peg width above 190 dragging the TT at up to 75 mph. 'tween Tucson and Phoenix with the ambient hovering around 107 degrees.

BTW, I love this towing truck, and it's completely stock. purdy too !