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My 98 chevy 1500 5.0 is heating up and down like crazy I changed thermostat and flushed system I have heater core disconnected

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Maybe the water pump isn't working properly.

Posted on Dec 06, 2014

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92 chevy 1500 silverado Changed thermostat,heater core, core hose not hot. No heat


It sounds like your heater core is stopped up. try flushing it out, you can use a water hose. and if you cant get it to clean out then you will need to change the heater core.

Oct 17, 2011 | 1992 Chevrolet K1500

1 Answer

98 chevy S-10. I turned on my heat one time, it made a weird noise then lost the heat and only blew cold air. After changing the lower heater hose, which was busted, I tried flushing the system and lost...


simply connect a garden hose to ether side of the heater core and turn on the pressure, it should flow freely, this is a good method to flush the heater core, then flush in the opposite direction

Jan 27, 2010 | 1998 Chevrolet S-10 Pickup

1 Answer

No heat. Changed the thermostat and flushed the radiator, had heat, now two weeks later no heat. Might be the heater core, yes/no, is it difficult to change? Just wanting to know.Where can I find...


I'ld say yes, heater core. But before swapping it out try this. There are two hoses that lead to your heater core. Disconnect them and add two longer hoses to it. Run one down to a bucket on the floor. The other flush with high water pressure, then there is this acid you can add. WARNING, I DID SAY ACID. It will eat your skin and if you leave in your heater core too long it will eat you core too! After say 2-3 mins flush with high water pressure again. On second flush I'ld flush for a good 10 15 mins to make sure it's all out. Reconnect factory hoses and refill system.

Jan 27, 2010 | 1999 Chevrolet Silverado 1500

1 Answer

How do I replace heater core in 98 chevy silverado? Heater blows fine, just not getting hot.


before you think it is your heater core try replacing your thermostat or flushing your system your heater core could be clogged feel the two hoses going into the heater core at the firewall they both should be hot

Jan 17, 2010 | 1998 Chevrolet C1500

4 Answers

Dodge Ram 1500 - I have no heat. Will replacing the thermostat slove this? If so how do I replace the thermostat?


Hello, No! I'm assuming that the temp gauge is working in truck & you are not over heating. On the passenger side firewall check both hoses going to/from heater core. If both are not warm then it is probably a heating core plug. You will have to replace the heater core.

Jan 06, 2010 | 1996 Dodge Ram 1500 Club Cab

2 Answers

I have a 2000 Chevy Silverado pickup, and the heater will not blow hot air. I replaced the thermostat, and nothing changed. The radiator was flushed and filled in the last two months as well. I have all...


once truck is warm check both heater core hoses to make sure they are both warm if not then check the cold water valve could be stuck shut not allowing coolant to travel in to heater core.

Jan 05, 2010 | 2000 Chevrolet Silverado 1500

1 Answer

Heater not heating, but it blows


Sounds like a clogged heater core, try flushing out the whole system and putting in a flushing Tee on to the heater core hose inside the engine compartment, There will be 2 hoses coming out of the fire wall possibley on the passenger side that go into and come out of the heater core, The Tee can take a garden hose connected to it,[3/4"] hose i think ,measure to be safe all you have to do is cut one of the hoses and install the Tee with 2 clamps and attach a hose, first i would attach 1 side to the Tee and attach the hose but don't attach the other hose just yet ,flush out the heater core first then switch the Tee to the other hose and leave off the other hose so that you flush out the core from the other direction and what ever is clogging up the core doesn't go into the rest of the system.then hook up everything and bring the vevicle up to temp and repeat this process [USE ONLY WATER TO FLUSH OUT ] BE CAREFUL NOT TO BURN YOURSELF WITH THE HOT WATER , PUT A RAG OVER THE TEE WHEN DISCONNECTING THE LAST TURNS ON THE CLAMP.Also change out the thermostat under the hood.

Mar 05, 2009 | 2003 Chevrolet Impala

4 Answers

The heater still won't work after I changed the thermostat on my


Get a female garden hose adapter from the local hardware store. Disconnect the heater hose from behind the fan pulley and attach the hose connection. Disconnect the other heater hose behind the alternator, aim it towards the ground and flush water through the heater core. This worked on my truck.

Feb 12, 2009 | 1999 GMC Sonoma

2 Answers

Heater Only Producing Warm Air


I had the same problem and remedied it by disconnecting the heater core at the firewall (you have to remove the plastic shield by the windshield to access) and filling the core with radiator flush. I let it sit for 4-5 hours and then flushed the core with water from my garden hose. To make the connection, I cut a rubber washing machine supply hose, which fit inside the tubes to the heater core.

Once flushed, I added "Water Wetter" to remove any air bubbles from the system. heat now works great.

BTW - both the dealer and and independent said I needed to replace the heater core, at a cost of $1500. Glad I tried this first! Good luck!

Jan 31, 2009 | 2001 Volkswagen Passat

1 Answer

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.

Dec 14, 2008 | 2001 Chevrolet S-10

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