Question about Cars & Trucks
Thermostats open by virtue of the coolant getting hot and expanding a wax insert that opens the flap valve. If the thermostat is not opening then one reason is that it is in the wrong way. The body of the unit has to face the head or coolant and not the hose. Next check the cores for blockages by having a flow test done on the radiator. Sensors have nothing to do with thermostats .All they do is turn fans on or tell the CPU when the coolant is hot enough to reduce the richness of the air fuel mixture.. Ensure that there is no air lock in the cooling system as it affects the heater operation if there is air in the heater and the hot water will not flow through the core. Ensure that the heater control module (tap) is allowing the hot water to flow to the heater core.
Posted on Dec 30, 2013
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Posted on Jan 02, 2017
Thanks for choosing FixYa and welcome to the site. Have you checked to see if it is a coolant sensor? Have you checked to make sure the fans are coming on? Are you leaking coolant anywhere? Checked the cap?
Posted on Apr 10, 2011
Yep! Take the heater hoses loose from the engine(one at water pupm\\mp and other one at thermostat housing area usually). Then take your water hose at your house,with a common old pistol grip nozzle,and spray water back thru the heater hose you took off the water pump side and that will force it back thru the heater core and out the hose you took off the thermostat side.
If you want to see the junk that flies out of it,tie a white rag or old tee shirt onto the end of the hose.You'll be amazed what flies out of there.Reconnect your heater hoses and see how it does.
I always fill the hose full of water so when I reconnect them,they don't have any airlock problem. don-ohio (:^)
Posted on Nov 08, 2011
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