Heater selector vaccum leak?
#1
Heater selector vaccum leak?
Hey guys, I'm sure this has probably come up somewhere but couldn't find any info on it. Now my issue in my 95 chevy blazer the heater blower works fine but as you go down the road it changes from vent to say defrost. but only does it under load, do i maybe have a vacuum leak in the dash? just wondering if anybody else has had this problem. I've checked all the lines that i could see and they all look fine. Thanks any help would be great.
#3
Hey guys, I'm sure this has probably come up somewhere but couldn't find any info on it. Now my issue in my 95 chevy blazer the heater blower works fine but as you go down the road it changes from vent to say defrost. but only does it under load, do i maybe have a vacuum leak in the dash? just wondering if anybody else has had this problem. I've checked all the lines that i could see and they all look fine. Thanks any help would be great.
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Last edited by LesMyer; 08-18-2015 at 11:47 AM.
#4
thanks for the response guys .. the vacuum is ok at the check valve i replaced that and the reserve tank on mine is a bulb attached to the hood. do those even go bad?. I'm thinking it a line in the dash, does anybody have a vacuum diagram of the vacuum lines in the dash?
#5
There is a diagram...but the "short" is that all vacuum lines begin at the HVAC controls and go to each vacuum actuator inside the dash.
And yes the reserve tanks on the hoods do go bad it someone has cracked it. With the engine running for a minute or so, pull the hose off the bulb and listen for the vacuum escaping.
But also check all of the vacuum hoses under the hood. These rot-out and leak. Replacing is easy, cheap and easy to do.
And yes the reserve tanks on the hoods do go bad it someone has cracked it. With the engine running for a minute or so, pull the hose off the bulb and listen for the vacuum escaping.
But also check all of the vacuum hoses under the hood. These rot-out and leak. Replacing is easy, cheap and easy to do.
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