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need help please

wayne g
12-27-2010, 05:47 PM
1999 1500 318 thermostat will not open .have carboard in front of rad lower rad hose cold this after about 40 mins and even drove it.swicthed heater hoses and ran that way is a 195 degree termostat (new) 2nd one i replaced water pump this truck does not smoke or have any sings of water in oil.truck does not build pressure or over heat.can some please help me with this.I have heat when giving it throttle or drivng but not real hot air. when stopped vent heat cools down.thanks in advace wayne

Chris Stewart
12-28-2010, 09:59 AM
Mine doesn't warm up quick or stay warm idling either...I thought it was because it was a durned ol' diesel.
Can you see any coolant flow under the radiator cap with the engine at running temperatures? The coolant should be still with an occasional bubble if the thermostat is closed.
You might try exercising the heater blend door by turning the temperature knob from coldest to hottest every once inna while.

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