Just Making Sure - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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 12-14-2006, 10:41 PM   #11
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Just rinse with a fine spray, not a heavy stream. And put a couple towels down in the passenger footwell. Have a helper watch and yell if necessary. Shouldn't be a big deal at that point.

With dual air, and not knowing your routing, you might want to towel both sides.

Keep in mind I don't think either of your cars should be bad enough to notice a difference yet. The 98 MAYBE, especially if you park around alot of trees.
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Old 12-15-2006, 12:21 AM   #12
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EVAP core = evaporator core.

Well, the usual cause of cloged EVAP cores is pollen and mold. So just parking under trees is not neccisarily a cause. There is no air flow to draw this in when parked.

Daily driving through a streach of highway that has a lot of pollen floating around can cause the EVAP core to plug.

GM studies showed that a great way to prevent the EVAP core from plugging is to "blow dry" the core before shutting the car off.

If running the A/C, you should turn the compressor off about ten minutes before you get to your destination but leave the fan on high. This will help to dry the core.

A core set to sleep when wet is what promotes mold and clogging.
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Old 12-15-2006, 10:59 AM   #13
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Quote:
Originally Posted by 1fatcat
EVAP core = evaporator core.

Well, the usual cause of cloged EVAP cores is pollen and mold. So just parking under trees is not neccisarily a cause. There is no air flow to draw this in when parked.

Daily driving through a streach of highway that has a lot of pollen floating around can cause the EVAP core to plug.

GM studies showed that a great way to prevent the EVAP core from plugging is to "blow dry" the core before shutting the car off.

If running the A/C, you should turn the compressor off about ten minutes before you get to your destination but leave the fan on high. This will help to dry the core.

A core set to sleep when wet is what promotes mold and clogging.
1fatcat, while we may appreciate the fact that you work at a dealer, again, our personal experience differs from yours. Would you like to see some pictures of foreign material pulled out of one? We have a few here. I had leaves in one of mine. I believe Hans had an entire ecosystem. Several others as well.

Now you see why I made the comment?
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Old 12-15-2006, 11:05 AM   #14
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Old 12-15-2006, 07:41 PM   #15
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Well, it sure was nasty. Lots of pine needles, seeds, and pollen. Emptied half a can of brake clean and sprayed it down with the hose. Got a little water in the passenger area but I had a towel ready on both sides. After putting it all back together I ran the defog first to dry the box. When I turned the lower and upper on no water came out. Now the bad news. It made little to no difference. I'll say it blows maybe 2% better then before. So I must have a blockage somewhere else.
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Old 12-15-2006, 09:04 PM   #16
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Let'* pull your blower motor next and take a look in there. We occasionally see buildup/nests in that housing.

You got all that debris out, including the needles? Do you have an ECC or manual?
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Old 12-16-2006, 01:47 AM   #17
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Yep, took all the debris out with forceps. I'm thinking you're right that there is a blockage between the blower motor and heater box. It has to be. There is no way anything can get between the evap core and the tributaries leading to the vents, is there? Yes, I do have a manual and I think it has a pretty good explanation of taking the the blower out.
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Old 12-16-2006, 10:47 AM   #18
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Blower motor is easier than what you already did. Alot easier.
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