Question about 2008 Chevrolet Impala
Antifreeze level is fine. High rpm,high heat. Low rpm,low heat
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Posted on Jan 02, 2017
SOURCE: heater only blows Very luke
Read all of these instructions before starting this job.
First test your heater core for flow by disconnecting both heater core hoses from motor and forcing air from an air compressor into one of them watching for flow from the other. If you have no flow then you may need to backflush your heater core - it is possible you have blockage in it. Your local auto parts store has a backflush kit you can buy that will have a backflush valve ( to be added to your supply heater core hose ) and an additive to put in your coolant system. The kit will not include new coolant so you will need to get that too. Install valve and connect a garden hose.Run motor specified time in the kit. Remove lower hose from your radiator and turn on the water from the hose full blast. Watch the coolant coming out from your radiator to see if any chunky stuff comes out - also watch for the color of the flow. Run water until it comes out clear, then shut off water and disconnect garden hose. Allow system to drain, reconnect radiator hose and cap flush valve. Refill coolant system, turn heat on high and run motor until it is warm. Top off coolant in radiator ( be careful - the pressure may cause coolant to spray out when you remove cap - put a rag over the cap before you remove slowly). If you do not have warm air at this point you may have a bubble in the heater core and may need to block rear wheels then raise the front of the vehicle until the radiator cap is higher than the heater core. Restart vehicle and turn heater on high . Check coolant level in radiator and top off, then cap radiator and shut off motor. Lower vehicle and start again with heater on high. If you still have no heat then your heater core may be plugged. To check, remove both heater hoses from motor and force air from an air compressor into one of the hoses, watching for flow from the other hose - if no flow then core is plugged and needs to be replaced, but if you have flow then you still have an air bubble in the system and need to purge using the above steps until you have heat.
Hope this helps and please rate my solution - good luck!!
Posted on Nov 29, 2010
Definitely check your fluid level in your radiator. Top it off all the way. I've seen that happen multiple times on cars that were low on anti-freeze. If that doesn't work try replacing your thermostat. It's cheap and the easiest place to start if topping off the fluid doesn't get you fixed up.
Posted on Aug 29, 2012
SOURCE: a/c blows hot air at idle
u have a trinary type switch on the high side somewhere on the high side,,,it may have 2 or more wires going to it and it is mounted on the high side line/or compressor,this is ur problem
Posted on Jul 09, 2009
I just had the same problem with my 1999 Silverado.I had a clog in my heater core,so I back flushed the heater core and then ran water throught the otherway.It worked and then replaced the cabin filters and now I get lots of heat.Be very careful removing the heater hoses because they have plastic connectors from the heater hose to the heater core.I ended up replacining the white connector.
Posted on Nov 15, 2009
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