Question about 1998 Chevrolet K1500

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1998 Chevy Tahoe doesn't heat up except when engine is reved up over 2000 rpm. Took heater core out and flushed it, checked hoses don't know what else to check? Help

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Iv the engine is not getting up to operating temperature and it is full of coolant (50/50 mix of coolant and water) the thing to check would be the thermostat. Where the hose comes off the top of the radiator and goes into the engine block there will be a round top housing there very close that houses the thermostat. Take off the housing and remove the thermostat. Place the thermostat in a pan of water on the stove and heat the water. Watch the thermostat. If it does not open when the water gets hot it is defective.

Posted on Nov 16, 2009

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I have a 1996 Lexus SC400 that heater does not work unless I put in neutral and reve up the engine to over 3000 rpm. How do I fix?


Check the coolant level first. Make sure it is full. Take a look at the condition of the coolant. It should be bright red, green, or yellow depending on the type of coolant. If it is dark, rusty, or muddy than it is likely that the heater core has plugged do to the lack of maintenance of your cooling system .

The good news is the heater hoses can be removed from the heater core and the heater core can be back flushed to try and clean it out. This works 90% of the time. If heat returns than flush the cooling system to help prevent it from happening again. If heat still does not return than the heater core would need to be replaced. $$$$$

this vehicle may have a manual valve that controls the coolant flow to the heater core. Look for the heater hoses near the fire wall. The valve is usually inline with one of the hoses and will have a cable attached. If you see it make sure the cable is moving when you turn the heat select knob from full hot to full cold.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

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How to unplug a 2005 chevy tahoe heater core


Put a full jug of CLR descaler or Plumbers radiator descaler in the radiator. Run it for a week, drain, flush, fill with antifreeze and then 'burp the system'. The last bit is very important and may well be the problem you have, the heater core is not full of coolant. Google it.

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first it to verify the coolant flow. I suspect the heater core isn't flowing, you may need to take a garden hose and take both heater hoses off, and flush in both directions to clean the heater core. flush in both directions until you get clean water flow. I am assuming the coolant level is OK, and the water pump is pumping and the engine is getting warm enough.

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Did you mean the only time it blows hot air is under acceleration?

First thing check the coolant level in the radiator. If coolant is low the first hing to stop working is the heat.

If the coolant level is fine but the coolant is muddy I woulds suspect a plugged heater core. You can try back flushing it by removing both heater hoses (engine cold) and then use a garden hose to flush clean water through the heater core. Do this on both pipes going into the heater core. Keep flushing until the water runs clear. Re attache the the hoses, remove the radiator cap, start the engine, let the engine come up to temp and top off the radiator with straight coolant (to comp for the water in the heater core). You may have to repeat this process several times over several days but you should be able to get it cleared enough to get sufficient heat without having to replace it.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

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Uplanders with the 3.9 engine are prone to no heat at idle speeds. Probably weeping head gasket. Air bubble trapped. Dealers will remove rad cap and let it sit at about 25 deg. angle for a couple hours. Good for awhile.

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the valve that allows the hot water into the heater core is not opening. most likely electronic issue. also check all vacuum and electric lines.

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Notorious for plugged heater cores. Also updated plastic restriction couplers mounted at heater core available from dealer. Try back flushing heater core. Run engine till its at operating temperature then carefully hold the inlet and outlet hose breifly with heater fan on high if hoses are nearly the same temp then flow is good , if not then core is plugged.

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I had problems with a similar truck,a 1998 GMC diesel after checking to make sure the control cables were operating the blend door and blowing the mess of the heater core,I replace the thermostats.Still no heat turns out there was a small amount of debris collecting in the fitting for the inlet hose at the thermostat housing after removing it and blowing out the lines the heat was fine.

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