Exact same thing happened to me. Cold heater air and constant overheating, dispite having a full coolant tank, means that the thermostat has gone. You need to get it replaced. Thermostats are cheap - about £24. It's the labour that can cost an additional £80-£90 as it involves removing the alternator to get to the thermostat. If you feel comforatble under the bonnet, you can do it yourself and save yourself a few quid.
On the coolant bottle.On the coolant bottle.
Coolant for the 98 Deville is added into the coolant overflow bottle. The side of the bottle should have low and high coolant markings.
The overflow bottle may overflow if: 1. The car is overheating - this means after the coolant in the radiator gets heated up and expands it flows to the reserve bottle but the radiator doesn't cool down to suck back the coolant from the overflow bottle, but just keeps on sending coolant to the bottle. 2. You may have put excess coolant in the bottle - hence heated coolant from the radiator didn't get enough space.
The engine coolant reservoir or the overflow bottle.
try unpluging the sensor in the overflo bottle. it could be dirty, or no good
It is built in the bottom of the coolant refill bottle. You have to replace the entire bottle if you have a bad sensor. If you don't want to fix it you can unplug the wire harness from the coolant bottle this will turn off the low coolant light on the instrument cluster, But you will always have to check your coolant level. If your somewhat handy you change the bottle yourself for around $75-$95.00.
The coolant level sensor is bad. It is integrated into the coolant bottle, so you need to replace the coolant bottle.
Sounds like you may have a bad head gasket.It will leak exhaust into the cooling system and create alot of pressure
add coolant to f250 system thru the overflow bottle this is a plastic bottle under the hood make sure not to add to window washer bottle
no antifreese
Coolant is added to the overflow bottle instead of the radiator. The overflow bottle will allow fluid to fill over into the radiator.
if its the 98 model to 05 model its under the coolant bottle pass side 3 screws hold in the coolant bottle