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Pontiac Bonneville Heating/Cooling Problems

148 messages,  Last post on Oct 15, 2009 at 1:40 PM

You are in the Pontiac Bonneville Forum. Your Hosts are pat & karens

What is this discussion about? Pontiac Bonneville, Heating / Cooling, Sedan


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#139 of 148
Re: hvac doesnt work at all [imidazol97] by cmazeo
Oct 02, 2009 (6:28 am)
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Replying to: imidazol97 (Oct 01, 2009 6:19 pm)

ok thanks, The interior lights on the unit do come on but not any of the lights on the buttons ( defrost, auto, rear, display... etc) . You mentioned the head being unplugged .. not sure what the head is but if it was unplugged would it affect the interior lights on the unit ?
#140 of 148
Re: hvac doesnt work at all [cmazeo] by imidazol97
Oct 02, 2009 (8:53 am)
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Replying to: cmazeo (Oct 02, 2009 6:28 am)

In the rear fuse block,
#33 HVAC
#34 Ign 3
#25 Pass MDL
#141 of 148
Re: hvac doesnt work at all [imidazol97] by cmazeo
Oct 02, 2009 (11:24 am)
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Replying to: imidazol97 (Oct 02, 2009 8:53 am)

#33 and # 34 checked out good, #25 has no power feeding the fuse at all. Thanks
..............also I pulled the unit out and checked the connector in the back where it slides in for power using a grounded probe light and I had pwr on about 4 of the leads on that connector. That unit is hvac unit is really flimsy.. I think I'll try and find one at the salvage yard and replace it .. maybe that's the problem.
will let you know ... thanks
#142 of 148
Re: hvac doesnt work at all [cmazeo] by imidazol97
Oct 02, 2009 (12:49 pm)
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Replying to: cmazeo (Oct 02, 2009 11:24 am)

You might want to check ebay and other used books for a Helm factory service manual for your Bonneville. Helm does the authorized manuals. Helminc.com has them available new. It sounds like you might get your use out of it troubleshooting.
 
You said your car was the automatic temperature control... because you said you couldn't see the readout. I didn't check the manual unit.
 
Odd the passenger door module wouldn't have power. Do the windows and power locks work on that door?
#143 of 148
Re: hvac doesnt work at all [imidazol97] by cmazeo
Oct 02, 2009 (9:52 pm)
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Replying to: imidazol97 (Oct 02, 2009 12:49 pm)

No, the power lock or window doesnt work. The window was stuck in the down position and I ended up powering up the motor in order to get it to go up. Will be checking on that service manual though.. thanks.
#144 of 148
Re: hvac doesnt work at all [imidazol97] by cmazeo
Oct 04, 2009 (1:08 pm)
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Replying to: imidazol97 (Oct 02, 2009 12:49 pm)

Ok I screwed up. I thought I was using the ground post checking for battery on the fuses but actually I was using a positive post near the fuse panel. I rechecked the fuses the correct way with the car running and not running. Fuse # 33 and # 30 had no power car running or not. I traced # 33 and found the wire (brown) was spliced into 2 other brown leads. I tied a hot lead to the other brown leads and started the car. The hvac unit works fine. The blower motor has a loud hum and weak air flow but at least I am getting close to fixing the problem. Thanks !!!! again for your help... Checked on ebay for manual... I'll be buying one from there. Thanks again.
#145 of 148
Re: hvac doesnt work at all [cmazeo] by imidazol97
Oct 04, 2009 (6:44 pm)
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Replying to: cmazeo (Oct 04, 2009 1:08 pm)

>Ok I screwed up.
Welcome to the club. At least you didn't "break" anything being backwards. I tend to break things that weren't already a problem.
 
This is what the factory service manual looks like and it is two manuals. This one is the Helm manhal.
 
try searching for combinations of factory, service, bonneville, pontiac, and see if you come up with some that aren't completely labeled.
 
Helm manual for GM
 
Try searching for combinations of factory, service, bonneville, pontiac, and see if you come up with some that aren't completely labeled.
 
here's one under 2000 bonneville service manual (no word factory) and it's $5 current bid 20 hours to go and $15 shipping.
 
link title
 
here's one for $9.99 and 9.99 shipping bid current.
link title
 
Make sure both manuals are there.
 
I didn't look under Pontaic without the bonneville word...
 
As for the circuits, I think studying the manuals will help.
 
Check the cabin air filter intake for the blower motor. If there's a filter it may be stopped up. See if the blades for the fan rotate freely while you have the filter out (you can easily see the blades when you're servicing the cabin filter out on the firewall.
#146 of 148
Re: hvac doesnt work at all [imidazol97] by cmazeo
Oct 05, 2009 (3:59 pm)
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Replying to: imidazol97 (Oct 04, 2009 6:44 pm)

I ordered a set of service manuals from ebay today.... cost about $ 27 with shipping. Should be here in a few days. Thanks again for the help. Will let you know how everything turns out. There are a few things wrong with the car .. so this should help.
#147 of 148
Re: a/c or heat blower vent changes on acceleration [imidazol97] by rockoh
Oct 11, 2009 (8:05 am)
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Replying to: imidazol97 (Sep 21, 2009 1:23 pm)

Ralph,
 
Man, you gave me the whole breakdown. Thanks dude, and I will let you know how it works out. I have been kind of busy so I just got a chance to look at the website again, but I am glad I did. I'll get back to you after my investigation.
 
Rockoh
#148 of 148
Proublems with heat and cooling system on a 1997 Bonneville - it heat by shannion7577
Oct 15, 2009 (1:40 pm)
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I own a 1997 Bonneville - it heats the inside at start up - couple of minutes later - it turns on the air - two mechanics are left shaking their head - while saying I have never seen it do this before, have you - what was the cause?

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