How to Replace Thermostat

Passenger side, front of engine, where the lower hose comes out of the engine, its behind the black plastic thermostat housing that is bolted to the aluminum front timing chain cover. Two bolts hold it on, 8mm socket gets them off.

This code is stored when the thermostat does not function properly and it causes the engine to take longer than normal to heat up to operating temperature. So to fix the problem will require the thermostat to be replaced. Have the thermostat replaced and the codes cleared.

if the blower fan is working then you need to change the thermostat and make sure the heater core is not bad.
if the fan is not working then check the fuse maybe your regulator or fan is bad
also try bleeding the thermostat

1. On 2000 Jeep Grand Cherokee 4.7L V8
2. Remove lower radiator hose clamp and lower radiator hose at thermostat housing.
3. Remove thermostat housing mounting bolts, thermostat housing and thermostat.

2000 Jeep Grand Cherokee 4.0l v6Note:on the In-line 6 4.0L model the thermostat housing is mounted at the top of the engine block next to the water pump.

Sounds like your thermostat is stuck closed. Shouldn't be more than a $20 part from autozone and is simple to replace. Follow your top radiator hose to the motor and it will connect to your thermostat housing. Disconnect the hose (antifreeze will run out) unbolt the housing, and replace the old thermostat. Refill radiator and bleed the system.

You can't set a thermostat but you should only use a 195 degree(f) or the engine sensors will think the engine has not warmed up.

CHECK FUSE TO HVAC CONTROL.YOUR HEATER AIR DOOR IS ELECTRIC CONTROL.

if you follow the top radiator hose to the engine you will find the thermostat...there shuld be a clamp holding the hose on the housing and there are two bolts that hold the thermostat housing on. once you pull the two bolts you will see the thermostat

follow top radiator hose from radiator to engine wear hose ends, it will be clamped to whats called the gooseneck, thermostat is under that. you will have to drain coolant, not all, maybe 1 half gal. before you remove it. 2 bolts new gasget new thermostat, just remember spring on new thermostat goes in engine.

You may need a GOOD new thermostat. I had the same problem twice on my first generation Dakota. The problem for me turned out to be the DODGE thermostat I used to replace the old Dodge part. I went and got a Stant brand from local auto parts store using the standard temperature spec and quit shivering the next time I drove it. I don't know if your engine is a Dodge or Chrysler engine, but it sounds like the same thing.