Question about Cars & Trucks
Replaced thermostat and heater core. Now when driving engine gets hot and blows out cold air. Guess all that is left to change is the water pump right? Also noticed the coolant system had a corroded build up while changing other components. What is the best method for cleaning it up
All that needs to be done is "burp" the system of the air bubble inside the heater core.(be sure that the vacuum lines are connected to the heater control valve)
This works for most cars and trucks:
Park the truck on a steep incline so the front is angled up at about a 30* angle.
Rev the engine a few times and then run the truck VERY hard for a few times at higher RPM.
That usually purges the air bubble out and you should get heat.
Check the coolant level in the radiator when it cools down.
Fill the resevoir ,again and see how much it takes.
Usually about 2 quarts.
After one cycle of hot and then cool,the resevoir/overflow bottle will cycle and pull the bubble out of the system.
The cheap/easy way to get the coolant clean is just to use the garden hose.Fill the radiator and then run the truck and drain it a few times.
If you do this,you will need to purge the system again.
Please recycle the old coolant. Sears and O 'Reilly's will take it,free.
Posted on Jan 19, 2013
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Posted on Jan 02, 2017
you should have hot water on all rad. hoses when the motor is running at a norm. temp. the water is not going through the heater core like it should. you have cutoff valve bad low water are a stopped heater.try a hoter thermostat if none of the above are true.
Posted on Jan 18, 2009
airjoc does not have a clue to your problem, I take you want to have warmer air not cooler ac. check the control system, if you have a vacum system tou may have a leak, if it is controlled by voltage, check the control panel and the control box. Also open the hood, place the heater on high but not on any defrost setting preferrably on just the floor setting. Start the engine and see if the ac compressor is running. If it is, the control panel is bad.
Posted on Oct 09, 2009
Chevy made some weak intake gaskets on 3.1 and 3.4. My guess is that the intake gasket is weak and/or leaking and it is letting pressure out somewhere. At idle maybe the system pressure is to little to push hot coolant into the heater core.
Posted on Dec 22, 2009
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