Heater Help

I have a 2002 GCS that has 100K miles. The heater is slow to warm and my fluid levels are fine. Any thoughts ?

Thanks.

Do you know whether the coolant has ever been replaced? It might be time for a coolant flush and fill and to replace the hoses and thermostat. If your thermostat is stuck open it would take a long time for your engine to warm up.

I have a 2002 GCS that has 100K miles. The heater is slow to warm and my fluid levels are fine. Any thoughts ?

Thanks.
Agree with the coolant change if it has not been done for awhile, combine that with a new thermostat. Mine doing the same again, last time it (the thermo)was not closing all the way. Causes slow warm up.

Ditto all above... my thermostat stuck in the open position and the engine never warmed up fully. I drained and flushed the system along with a thermostat replacement... problem fixed.