Question about 1996 Chevrolet Blazer

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Heater blowing cold air

Sometimes i have hot air,sometimes cold,should i replace themostat 1st

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Hi!
It appears we have an Air lock scenario and you will need to perform a system Bleed.
Park the vehicle on level ground, when cold remove coolant filler cap, start engine and leave to idle, turn heater on full and blower to max. When engine reaches operating temperature watch and listen near coolant filler, keep clear as gurgling and hopefully a boil over should occur. Top up with very warm coolant and wait as it may do it again.
Check for heat inside vehicle if warm replace coolant cap but keep an eye on temperature gauge as the ~Air lock may have moved on from heater matrix/core so proceedure needs to be carried out again from COLD.
If No change then look at thermostat but I'm sure your problem lies with the heater Matrix/Core!
Please press the Blue button to appraise my FREE Efforts, Thank You!
Paul 'W' U.K.

Posted on Feb 06, 2009

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Posted on Jan 02, 2017

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