Wondering if there is still a bunch of air in the system. It seemed like I spilled a lot more on the floor than what I was able to put back into the system. Temp is getting up to about half way between 1/4 and 1/2. outside temp mid 30's yesterday. Or is there something they did when they replace the turbo because after that is when we noticed the tstat.

When you refill the system if you have not already done so you need to open the valve on the top passenger side of the radiator (ideally turn in to 4 o'clock and pull straight up to remove; replace is the reverse; or at least crack it open). Then fill the system, not too fast, from the plastic coolant tank on the firewall (if doing a new fill add 6-6.5 qts of undiluted HOAT antifreeze first then demineralized water) until fluid starts to come out of that valve, which minimizes the air left in the system, and then close that valve. Complete the fill of the coolant tank to ca. 3/4" above the midline. Do a couple of drive cycles to hot engine and then full cool to purge the remaining air; you might have to add a bit of fluid to the coolant tank but not much if any.

Also check the routing of the coolant hoses from the tstat; there as been at least one report of misrouted hoses causing heater problems. Routing is as follows:
1. obvious really big port hose direct to radiator
2. small right angle tstat fitting hose to coolant tank
3. large plastic fitting (next to the above) goes thru a short "bent" hose to the passenger side of the viscous heater. Fluid flows thru the viscous heater and out the other viscous heater fitting thru a hose directly to the heater core.
4. bottom large aluminum fitting bypass port hose goes to the water pump inlet

Of course it is possible you have a clogged heater core especially if non-HOAT coolant has been used in the system. If so the whole system needs a good flushing and refill with HOAT coolant (Xerex G-05, Mopar, or Ford equivalent - not some "universal" coolant no matter what claims are made for that coolant)

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Sold to LOST member my 05 Ltd, GDE Stg II turbo + TCM tune, SunCoast TC w. Transgo kit, Steiger window regulators, Samcos, Fumoto valve, 2nd gen filter head with Lub. Spec. bleeder, Hayden clutch & 11 blade fan, inverted spare, P-1 battery, BF Goodrich Long Trail TAs, Etecno1 glow plugs, timing belt at 50K miles/8 yrs

Have all the coolant hoses been reconnected to their correct spots?

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2006 Liberty CRD Limited

Provent @ 43,000 km
SEGR in progress
SAMCO Sport hoses @ 48500 km
Goodyear Wrangler Duratrac LT225/75R16

it is a self purging system so you should have to keep filling the overflow, When I did the t-belt it took a few cycles to get all the air out.

An alternative explanation is that the viscous heater burned itself out when the thermostat failed, basically running way more than it was designed for. If bleeding the system doesn't fix the problem, look up a few threads talking about heating issues - it's also possible to put the hoses on incorrectly when reassembling.

Since the Viscous heater is a big ticket item - ya gotta check the easy ones first.

Mark

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2005 Liberty CRD
2004.5 Cummins 5.9L TD, F1s, NV5600 6-speed in a '93 GMC Suburban