Author	[Modern View]
fieldman12 07-29-2012 18:05:13 66.87.7.191 Report to Moderator	I know I have an issue with my temperature gauge because I can see it move around some when I turn the light switch to different positions. So far I have not had luck find the wiring issue where the wire might be grounding out. I would like to know where the temperature should read on a 2155 when things are as they should be? Should it be middle ways in the green or over mid ways in the green? Also when running and working the tractor a good while I hardly ever have any pressure it at all when removing the radiator cap. I have pressure checked the system and have found no leaks. I have replaced the radiator cap also with a new cap from John Deere. I asked a mechanic at john deere if there should be pressure when removing the cap and he said this model is a low pressure system and should not have hardly any. Is he telling me correct? I have taken an Infrared scan gun around the head and get around 180 to 185. Down about midways in the block way below the head for some reason it will read around 204. Is that normal? Also how can you tell the water pump impeller is bad without removing the waterpump. Tractor does have a new thermostat and temperature sending unit. The antifreeze test at 170. Tractor has never boiled any coolant and appears to be fine [Reply]   [No Email]
Hogleg 07-30-2012 10:47:10 38.104.162.74 Report to Moderator	Re: 2155 gauges in reply to fieldman12, 07-29-2012 18:05:13   I have a recurring temp fluctuation problem on my 2550. It is caused by the wiring loom connector on the firewall. I cleaned it this spring but did not have a small enough wire brush to do it right. Some wires are hot even with the ignition off so be careful. It is better but sometimes in hot weather still goes nuts. When it fails, it goes to the red sometimes bouncing back and forth, sometimes hard in the red. With a laser temp on the outlet of the block I have never seen it above 205, mostly between 185-190 so convinced that the cooling system is just fine. I believe that there is also a temp idiot light with a different sender. Only saw that on once in all the time I have run the tractor and that was with a blocked radiator (hay chaff). Going to buy one of those 17 cal wire brushes for cleaning rifles. That and some good electrical contact cleaner should fix it good. John [Reply]  [No Email]
Tx Jim 07-30-2012 04:11:14 67.142.163.26 Report to Moderator	Re: 2155 gauges in reply to a49deere, 07-29-2012 18:05:13   Temperature gauge fluctuation with light switch operation is probably due to poor dash mount ground connection. With radiator cap removed and engine up to operating temp. one should be able to see coolant movement indicating that water pump is pumping coolant. It appears the 2155 came from the factory with a 82°C (180°F) thermostat. Only one radiator cap had spec's listed. serial numbers AT29054 FILLER CAP 1 - 481899 X AL38374 FILLER CAP 1 481900 - 621999 (7 psi) [Reply]  [No Email]
jddave 07-29-2012 18:41:25 67.84.197.236 Report to Moderator	Re: 2155 gauges in reply to fieldman12, 07-29-2012 18:05:13   Fieldman, I have two 2155's, - both about the same hours. One the temperature always reads midway in the green and the other always reads high in the green. When I got the higher reading tractor I was alarmed and checked everything. There were no problems I could find. Neither tractor has ever boiled. I'm convinced the gauges or senders are flukey and just read differently. True the difference would lead one to investigate the resistance in the wiring and connections but my thinking is that your tractor is fine. More often than not problems with erratic gauges readings are sender or connection issues not a problem with the gauge itself. I would say if there is no boil-out you are OK. [Reply]  [No Email]