Thermostat failures becoming common.

lmorris · March 17, 2017

Starting to see a lot of these.

kridd12 · March 17, 2017

Yeah have been seeing quite a few now. Not so much on the older 6.7 but 2013 and newer have done quite a few.

mchan68 · March 17, 2017

Does that happen to include '17 model years by any chance? I had a one yesterday with a complaint of no heat at idle. The passenger side vents seem to blow decently warm heat, but the two driver side vents blow lukewarm at best. Both inlet and outlet hoses of heater core seem decently hot. And this is on a unit that doesn't have dual zone climate control.

Steve Mutter · March 18, 2017

Are bad thermostats leaving a code at least.

Matt Saunoras · March 18, 2017

I just happened to spot one on the last fuel system I did. The truck was a 12 F-550 with over 100k miles. I had the upper rad hose off and just took a peak down in the housing noticing the torn seals.

tonybullitt · March 19, 2017

I have replaced several lately also

lmorris · March 20, 2017

The ones I get have the upper hose getting hot at 165 F. No codes. No complaints. I catch them when they come in for other concerns. This one had a leaking rad and the fan clutch was inoperative. 170,000 KM's.

kridd12 · March 20, 2017

Same here only finding most of them when apart for other jobs. Only had one come in with a lack of heat complaint and there was no rubber left on either thermostat but no codes were being set either.

tonybullitt · May 2, 2017

Just replaced t stats for regen concern. Truck was setting incomplete regen code test drove monitoring pids couldn't get ect over 165. Replaced t stat all ok