Heater cores are being made with such small tube/passages that small specks of rust, dirt, bugs, anything that may be traveling around inside your engine with the coolant, sticks to the heater core. Lately, I have been calling heater cores "coolant strainers". Ha Ha. Here is what you do. Take the heater hoses off (at the engine). Push water through both ways. Chase that water with some air pressure. This will blast all debris from the core. Hook up the hoses, fill the coolant to the proper level, and POW you have heat.
SOURCE: 1999 chevy s-10 with no heat
You most likely have a clog in the heater core. Did you hear a sound like running water under the dash on the passenger side at one time? If so, it's almost certainly a clogged heater core. The problem is that the orange antifreeze clots. It should be changed more often than recommended.
SOURCE: heater problem / engine over heating 5.7 hemi 2004
Test for blown head gaskets, combustion gases can be tested at the radiator neck with engine running
SOURCE: Thermostat needs replace on 2005 Dodge Stratus 2.4 liter motor
If it's a chrysler engine the thermostat is located just below radiator cap. If mitsubishi diamond star engine it's located on the cylinder head , beside the air cleaner housing
SOURCE: my 1995 cadillac seville sts is over heating i
The most common overheating problem with the Northstar engine is a blocked purge line(small hose).The purge line is designed to purge air out of the cooling system.
There is a small diameter hose coming from near the top of the coolant tank (not the cap) ,this is the purge line.
With the engine idling,pull the purge line from the tank,if there is no coolant flow from this small hose,it is blocked and this will cause overheating.
If the hose is clear, check for blockage at the nipple on the tank.Or trace the hose back until you find the blockage.
The hose goes in to the engine to a crossover and comes out the other side close to the thermostat housing,the blockage may be there.
SOURCE: need to flush cooling system of a 2005 chevy
You can buy a flush kit from your local auto supply store to add to your cooling system for this and future flushing. As for changing your thermostat - simply remove the thermostat housing - remove the old thermostat - replace with new (be sure it is the one rated for the season at hand) - replace gaskets (or use RTV gasket maker) and reinstall housing. Fill the system with proper % ratio of coolant to water (usually 50/50). Drive away happy.:) PS You can find your thermostat housing by following the top rad hose from the rad back to it at the intake manifold.
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