blazer

[96 silverado]

I own a 96' chevy blazer, 90,000 miles on it. question is that the motor warms up like it should but there is luke warm heat blowing out.  any ideas are apperiated.   Thanks Dave

[mnstrmdnss]

are you sure your coolant level is full? pop the radiator cap, the coolant should be at the top if everything is ok, if not, and if your absolutly shure that nothing is leaking, then the radiator cap is the culpurat. if the cap isnt sealing against the radiator, then the coolant cannot build up pressure like its supposed to, then it evapotates out through the cap, causing an air bubble in the cooling system, and air bubbles always find thier way to the heater core(im a technician at pepboys, so i deal with cars everyday).

 

btw, the only way to pressure test the cap is to take it to a service department, they have a special pressure testing tool for coolant sytems and caps.

[mcali17]

First thing is have you ever had your coolant system flushed? GM recommends changing the coolant every 5 years or 100,000 miles. If not, you are about a year or more overdue. Check the maintenence schedule in your owners manual.

 

Second thing is, remove the radiator cap and look for a milky buildup on the back of the cap. The coolant that should be in your truck is the pink / orange color stuff. This is Dexacool, silcate free coolant. If you do have the milky buildup, take your truck to a qualified shop, have the radiator flushed and thermostat replaced. GM had some problems with the buildup of this milky substance in some of the first '96 trucks to use this coolant. This may also be built up inside your heater core and could be causing the low heat problem.

 

 

I am not a Pep Boys mechainc, but my family has owned a Citgo Service Station for 45 years and my dad is a GMC truck dealer.

 

Let us know how it goes.

[96 silverado]

thanks for the info. I will let you know thanks Dave

[96 silverado]

got it flushed and the heat is fine thanks for the help.

 

Dave

[mcali17]

Glad it worked out for you.