Gauge on dash panel keeps showing hot. Changed out thermostat and water pump. Still shows hot on gauge after about a mile.
by Visitor in Gaffney, SC on November 07, 2010
First, make suer it's bled correctly. This is how to do it: Bleeding cooling system and checking for water leaks
Top up cooling system, bleed cooling system, refer to Coolant, Service and Repair.
Check cooling system for water tightness, refer to Testing and Inspection, Procedures.
Set heater control to maximum temperature and set fan to low speed. This opens heating valves and installed auxiliary water pump runs if necessary. Run engine and flush out engine cooling circuit with three or four short bursts of throttle (approx. 4500 to 5000 rpm) (sealing cap open). While doing so, do not run engine for longer than approx. 30 sec. to prevent coolant from heating and and expanding. If coolant level in expansion tank drops during this, top up expansion tank to the brim with coolant. Attach screw cover and run engine to heat it up until thermostat opens.
If it won't help, follow Ron and Patrick suggestions.