Question about 1999 Chevrolet Blazer

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1999 Chevy Blazer blowing cold air through vents. Changed water pump, thermostat and checked the heater core. Antifreeze isn't circulated through radiator but all lines are hot

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Your Blazer may have a clogged radiator.

Posted on Dec 16, 2016

Testimonial: "Is there any way to test for a clog?"

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I have a 2004 chevy trail blazer it wont heat very well only luke warm air I have changed the fan thermostat and water pump


Possible plugged heater core. Check heater hoses when engine at operating temperature. Both hoses should be close to the same temperature. If one hot and one warm/cold, suspect a plugged heater core. A backflush will be required to correct the problem if it is plugged

Jan 05, 2016 | 2004 Chevrolet TrailBlazer

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Blower works but blows cold air what would cause this would it be the thermostat or heater core


If your thermostat is staying open then it won't get hot in the cab,if the heater is bad,it will leak and fog up the window,another cause could be the blend door is stuck close,or the valve is stuck close and antifreeze can;t circulate thru the heater core.When you first start your car does the thermometer on dash go up then cone down,if it is then thermostat is good.

Aug 07, 2015 | 2003 Toyota ECHO

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2001 Blazer Replaced heater core now water pump is squealing and seems like low circulation


my 98 Blazer I had to replace radiator water pump heatercore and hoses. Had head gasket go. Once that happens air and dexcool corrode cooling system. Do you smell antifreeze? Are you loosing antifreeze? Check oil see if its another color not clear or black but i think light brown. Have you flushed out system?

Jan 31, 2013 | 2001 Chevrolet Blazer

1 Answer

Why is heater not blowing hot air on 99 chevy blazer


if the fan blower is working then it must be the heater valve inline with the heater hoses. Or the selector on the dash has broken and is not connected at the back. You have tried everything else. You were correct in what you wrote above and have tried so far

Nov 21, 2012 | 1999 Chevrolet Blazer

2 Answers

Truck overheats and only cold air blows out of heaterf


Sounds like low on antifreeze...or not circulating ..bad water pump...

Apr 28, 2011 | 1998 GMC Yukon

3 Answers

My 92 for taurus wagon is blowing cold air instead of hot air, what could be the problem?


Behind the tempearture switch is an arm that is telescopic and raises and lowers the temperature. If this arm is either broken off or loose, it can create an inability to change the temperature. It can also be a problem with the heating unit in the ac in the car.

Mar 21, 2011 | Ford Taurus Cars & Trucks

2 Answers

I replaced the thermostat, but it still blows cold air. What gives?


The ford taurus and mercury sable are very well know to have coolant pressure, heat problems. I have worked on a minimum of 300 of these specific vehicles in my career, I can tell you the system is a headache,yet manageable. Are you getting cold air through the vents? is the blower motor working? Is your antifreeze brown in color or goo like? (a tell tale sign of a broken water pump and 90% probability of a clogged heater core.
also other basics, have you flushed the system and checked to make sure the car is not air bound?

Feb 18, 2011 | 1998 Mercury Sable

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

2 Answers

Changed thermostat and added coolant but 1997


could be waterpump?
i was going to say rad fan,but if so heater would be hot.
lack of coolant will make heater core to blow cold,if engine heats up with full coolant,usually means poor or no circulation.
water pump?
run engine with full coolant,at operating temp.with rad cap off and look in rad cap hole and see if there is movement of water inside rad.
[rad fan will not come on if water is not circulating through rad water pump?]

Dec 20, 2009 | 1997 Chrysler Cirrus

3 Answers

NO heat.... Just is blowing cold air, never warms up. Do I just need to change the thermostat or is this going to be a bigger job? And where in the hell is the thermostat!?!?! (yeah, I have worked on allot...


Forget the Thermostat.
Start with no $.
Check Heater Core, leaks in rubber hoses ( they go to the firewall, should be hot when touch them (2) ) Coolant Level.

Nov 07, 2009 | 1999 Mitsubishi Galant

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