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1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 10-09-2007, 03:39 PM   #1
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Default No Heat :(

I have no heat, but cold air does blow from my vents. I also noticed when I turn on defrost/climate control my oil pressure jumps to the nest mark or higher depending on engine temp. (colder temp higher pressure)

I wanna think it'* the blower motor, but prefer to hit the nail on the head first time out.
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Old 10-09-2007, 03:42 PM   #2
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If when you turn the fan speeds up and down, you feel more and less air and hear the blower..then the blower would appear to be good.

If you get cold air and not warm, that would typically be something to do with the air mix door actuator.
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Old 10-09-2007, 03:49 PM   #3
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I can adjust the fan speed just fine. I just have no heat whatsoever. Wish I'd noticed sooner but with it being so hot lately...heat was never a thought.

Eh what is this door you speak of? Never heard that term before.
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Old 10-09-2007, 04:07 PM   #4
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Check the coolant level in the radiator when the car is cold. It should be all the way to the top. There should be coolant in the recovery (overflow) tank, too. If coolant is low in the radiator, heater is often starved of flow and cannot make heat. If it is low, you will need to find out where the leak is. Hopefully if you have a leak, it will be external (hose, radiator, water pump), and not internal (bad LIM gasket, bad UIM, cracked head).

Heater core may be plugged or clogged, also. If coolant level is OK, feel the hoses that run from the tensioner assembly to the heater core after the engine is warmed up. I think the top hose feeds hot coolant from the engine and the bottom one returns it from the heater core. If the top hose is hot and the bottom hose cold, the heater core is probably plugged. If both are hot, that implies a good flow through the heater core and strongly suggests the air-mix door problem that Boosty mentioned.

Do a search on "air-mix door" and get an education.
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Old 10-09-2007, 04:18 PM   #5
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ah ok.thanks for the info.
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Old 10-09-2007, 04:38 PM   #6
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After some reading I noticed that a blinking temp dislay indiacates an issue. I have the blinking.

So the full rundown seems to be I have a blinking ECC when car starts with no heat, but fan speed does work fine.
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Old 10-09-2007, 04:48 PM   #7
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Assuming the heater core is what I saw between the radiator and fender (based off a pic i looked up) the tubing is metal and both are warm but much cooler than any other tubes or hoses after a short drive.
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Old 10-09-2007, 06:31 PM   #8
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Blinkage and no heat is typical of a toasted airmix actuator. a good way to verify this is to pull out your glove box, get a flashlight, and look through the hole in the dash brace while operating the temp up & down. You should see smooth steady movement of the door arm. Any hesitation or jerky motion (or lack of motion) means your airmix actuator is not long for this world. Here'* a link to an article with pictures that will help 'splain what I'm talkin' 'bout. Picture 18 is a decent image of the hole you need to look through. (You can't see this without removing the glove box).

http://trialsnuts.com/ecc.pdf

When you decide perform and exorcism on your airmix actuator, this article will be somewhat valuable.
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Old 10-09-2007, 07:53 PM   #9
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Quote:
Originally Posted by Riding
Assuming the heater core is what I saw between the radiator and fender (based off a pic i looked up) the tubing is metal and both are warm but much cooler than any other tubes or hoses after a short drive.
Nah, the heater core is hidden in a compartment up against the firewall under the dash above the passenger'* feet in a plastic box. On top of that box is a little electric stepping motor with an arm that moves a flap allowing air to flow through the heater core (and heat to flow into your car). The flap is the air-mix door. The motor is the air-mix actuator. Standing on the passenger side of the car you will see two 5/8" heater hoses (about an inch in outside diameter) disappearing behind the strut tower. Those are the heater hoses. The hoses are visible in this image, disconnected from the tensioner assembly with the engine removed. The hose on the left carries hot coolant to the heater core, the hose on the right returns slightly cooler coolant back to the engine.

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Old 10-09-2007, 09:36 PM   #10
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Yea I was shown the correct placement when I had a buddy look. Seems the actuator is the issue. for teh time being just pulled the a/c compressor fuse.

After pulling the glove box, I didn't see the arm or much of anything like an arm due to a jungle of wiring. Will have to better examine on a weekend whn I have the time.

Not really looking forward to taking off the dash to fix it....

Now I just need all you club members to move in on the same street here hehe.
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