Question about 1994 Chevrolet S-10 Blazer

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I have a 92 blazer with an oversized radiator and the heater only blows cold air any suggestions

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What size engine thats a 4.3 right? Did it come with DEXCOOL in the coolant system If so the heater cores probablly clogged. That stuff is horrible.. does the engine get to operating temperature?

Posted on Nov 03, 2010

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Heater blowing cold air replaced thermastat next day heater blowed hot then it started blowing cold again has a new radiator and the water is not low


Flush coolant system out first with prestone or peak coolant flush if problem still exist replace heater core.

Apr 05, 2011 | 2001 Chevrolet Blazer

1 Answer

My 98 blazer is over heating and the heater is blowing cold air.. I already changed the thermostat and added radiator fluid... What else could it be??


Symptons still sound like radiator is low. When engine is cold , take off radiator cap and and start vehicle. Let it idle until you can see that the water is circulating (once the engine thermostat opens up). Top it up until Rad is full and still circulating. Then check your heater . Put cap back on and hopefully your problems are solved. Also check under vehicle when it has idled for a while to make sure there are no leaks. Top your surge tank up to appropriate level. Good luck.

Nov 24, 2010 | 1998 Chevrolet Blazer

2 Answers

My 99 Blazer won't blow hot air. The Heater core


The problem was a vacuum line leak. Replaced the line.

Dec 30, 2009 | 1999 Chevrolet Blazer

1 Answer

Heater blows cold air


Check there is water in it first. A black cap on top of the radiator. If the level is ok then a wee red dipstick should float up.

Dec 12, 2009 | 1999 BMW 323 Series

1 Answer

No heat, blows cold air, flushed system, then a day later blew radiator, changed that still no heat... one mechanic said its the blender box? any suggestions will help...


I would check the heater tap in the heater hose, this may be blocking the flow. {causing excess pressure It could also be possible that the heater cable may have come off the back of the control or off the heater flap on the box. lastly, replace the $8 engine thermostat. You can also test it in a glass of boiling water and watch to see if it opens. Good luck.

Nov 19, 2009 | 1998 Chevrolet Blazer

1 Answer

Heat isnt working. it just blows out cold air.


change your heater core usually on pass side underdash.
have fun standing on your head to do it

Oct 30, 2009 | 1992 Honda Accord

1 Answer

2001 chevy blazer, heater blowing cold air


Pull the stereo back out . they have bumped the vacuum lines that connnect to the heater near the rear of the switch ..

Jan 25, 2009 | 1994 Chevrolet S-10 Blazer

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