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I have a 1994 chevy blazer and the heater blows out very little heat. After awhile it sometime starts blowing and other times it don't

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Take off the feed pipes,close with 2 pairs of mole grips so coolant doesnt leak then flush the heater rad out with a hose doing it in both direction then refit pipes remove the molies and top up with neat antifreeze .that should work

Posted on Jan 15, 2009

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99 chevy blazer blows heat only sometimes


You need to check for a loose ground again. The dash seems to have a loose ground. Your heat and ac are controlled by motors that get input from your switch. You might try following that harness and see if there is a loose ground. Other than that I don't have a clue. You might also check near the firewall and make sure the ground strap there was bolted to the engine.

Dec 14, 2011 | 1999 Chevrolet Blazer

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I have a 98 blazer that in the morning blows ice cold air. After driving for awhile it will stop blowing cold and if you turn it off wait and turn ot back on it sometimes blows cold again. ANy ideas


I would replace the low pressure AC compressor cycling switch, it may be sticking, it is a fairly common problem. The switch is located in the low side of the AC system hoses or accumulator.

Jul 22, 2011 | 1994 Chevrolet S-10 Blazer

1 Answer

My 1994 Chevy Blazer S-10 is not blowing out any air when I turn the heater on...


Is the fan turning on? I assume so.. when you change the hot/cold selector do you hear the flaps inguage? could be the linkage there. Otherwise, check your coolant level - make sure your heater core isn't plugged (let engine heat up, then see if the heather both heater hoses going into the firewall are warm). If one is colder than the other, flush the heater core.

Jan 23, 2011 | 1994 Chevrolet S-10 Blazer

4 Answers

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Does it have coolant in the radiator Check this first . Does the fan Work ???

Jan 23, 2011 | 1994 Chevrolet S-10 Blazer

1 Answer

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Start by flushing your coolant system and replacing your thermostat. You may later find that you have a clogged heater core.

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1 Answer

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It sounds like you have low engine coolant levels or air trapped in the coolant.

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1 Answer

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

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1 Answer

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Hi! U need to check the circuit,there could be a slack connection in the circuit.

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check to see if there is any paper stuck behind the glove box thatrestricts air from flowing i had the same problem with my yukon

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2 Answers

My 1999 chevy blazer will not blow heat


the age of the vehicle does suggest the heater core could be plugged, when the motor has been run awhile where is the temperature gauge (if it has one). ?
If i remember right it's not that bad a job to replace the heater core in those trucks... but it's been awhile for me. I would suggest some cardboard or something in front of the rad to see if it warms up at all. if so it is likely a thermostat that needs to be replaced.

Robert

Dec 15, 2008 | 2000 Chevrolet Blazer

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