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Heater Cores and Blower Fans
Chevy Blazer S-10
Car Heaters

Can after replacing heater core in 1989 Chevy S-10 blazer you hear a vacuum leak coming from behind the temp control switch the air only blows out the defrost and heater vents How do you fix this?

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Wiki User
2006-01-16 01:21:52
2006-01-16 01:21:52

sounds like you may have a vaccum leak or a broken line to the vaccum podes on the controler behind your dash, these open and close the door to direct the air flow

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More than likely the vacuum feed line from the engine has been disconnected or cracked. When there is no vacuum supplied to the HVAC it reverts back to the defualt position, the defroster.

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Remove you glove box. It should be behind it.

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behind the ashtray is a vacuam control soliend it has 5 coils that control the vacuam doors

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Usually found behind/under the glove box or behind the kick panel.

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The air door under the Blazers dash could be stuck, or there could be a vacuum leak on the engine. The door opens and closes from vacuum, directing the air from heat to defrost.

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i believe it is for the IAC valve. (idle air control) valve. cleaning with brake cleaner can solve the issue. or replacing completely.

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What causes heat to only come out of the defrost and vent but not the floor of a 1995 S10 Blazer?

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The heater control valve (temp blend door) is located behind the dash assembly. The dash assembly has to come out to gain access to it.

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Where is the tcm in a 1994 chevy S10 Blazer

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on the left side of the air intake/throttle body. there are two screw that hold it in. I t sits right behind the fuel control valve.

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behind the passenger side front inside wall panel next to glove box

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Generally it is behind the kick panel on right side, but it can also be under the dash or behind the glovebox. Try the kick panel first, it bolts to the back side

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The default for heaters is to go to defrost if there is a problem in the system. You will have to get under the dash to find the problem. Probably best to take it in as they can get tricky without diagrams depending on the system

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In our 96 Blazer S10, it was behind the radio. We had to remove the radio to get to it.

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did you check your battery and alternator?

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Check the 96 Blazer for any vacuum leaks in the system. A vacuum leak can cause the air flow to only come out of the heat vent.

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Behind the passenger side kick panel or behind the glove compartment.

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Assuming you're referring to the AC system, there isn't one... as far as I know, all model years of the Blazer (K5, S10, and the midsize model replacing the S10 Blazer when the full sized Blazer became the Tahoe) used a fixed orifice tube.

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The heater temp blend valve is located behind the dash assembly. The dash assembly must be removed to gain access.

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Check the vacuum supply from the engine. If it is disconnected or cracked the system will default to defrost only.

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The 1996 Chevrolet blazer transmission control system helps the transmission to maximize optimal fuel consumption. The control system keeps the transmission in the overdrive gear.


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