94f1504.9l

hello i recently changed my thermostat in my I6 due to not having any heat . old one was clogged. but now it will heat up ok but the pressure will drop randomly and the gauge will rest on O in normal or go below the N randomly. idle it will stay on O but once i get on the freeway it drops
new thermostat is 195f gates. plus heat isn't very hot more warm but not hot. a buddy told me to check the head gaskets but i dont smell any sweetness in the exhaust and there is no white smoke

fomoco998

Head gasket which you only have one will cause overheating. If you installed a fail-safe thermostat that could be your problem. Also air in the system can cause your no heat and fluctuation on gauge . Also flushing system helps with the heat.

94f1504.9l

We flushed the system twice and I have to add a quart of coolant every week and a half

94f1504.9l

This is where it's been sitting all day and it's been in the lower 70s and stuck in traffic

Chris_1

iTrader: (1)

That's about where mine sits. They are all different, it's just an approximation. The thing to watch for is sudden change.
The more serious problem is where is a quart of coolant going every 2 weeks ? It's not supposed to go anywhere.