A/C, Heater problems-Hot in the Summer, Cold in the Winter

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, Olds 98 91-96, Buick Lesabres and Park Avenue 91-96. Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.
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Troxartes
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Year and Trim: 1998 Pontiac Bonneville SSEi

A/C, Heater problems-Hot in the Summer, Cold in the Winter

Post by Troxartes »

Hello everyone.

I have a 1998 SSEi with an A/C system that I can't get blowing cold air in the summer, but is now blowing cold air, in the winter. It starts to blow hot air but it only lasts a few seconds. It seems like such an inexplicable problem to have. I am beyond frustrated. I tried to find a similar problem in the boards and nothing even sounds close. I recently had a check engine light that returned a code about a faulty thermostat, but it has gone away on its own. Since that warning, the car has run slightly hotter than it usually does.

Sorry about the noob question. I appreciate any help you can give me!
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J Wikoff
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Re: A/C, Heater problems-Hot in the Summer, Cold in the Wint

Post by J Wikoff »

Sounds like an air blend door actuator issue to me. I think there's a write-up on it in the Techinfo.

Hrm... The pics are broken, but here it is.

http://www.pontiacbonnevilleclub.com/fo ... c3537.html
Image
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AJT2004
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Re: A/C, Heater problems-Hot in the Summer, Cold in the Wint

Post by AJT2004 »

I would also suggest checking the coolant level. Take off the radiator cap, don't assume it's full by the level in the coolant expansion tank. A low coolant level could cause intermittent heat and higher temp.
2004 Bonneville SE 151,xxx- 20% tint all around, 5% tint bar on windshield | 4500k DDM HID low | De-badged | Hardwired Passport 9500ix | FWI(inter-cooler piping) | FE2 Rear Sway Bar | Solid Motor Mount | 180* Stat | Firm Shift Kit



- '92 Bonneville SE - '85 Grand Am - '73 Catalina - '67 Catalina
- '87 Bonneville SE - '82 6000 - '78 Catalina [/color]
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gmman
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Re: A/C, Heater problems-Hot in the Summer, Cold in the Wint

Post by gmman »

http://www.pontiacbonnevilleclub.com/fo ... ?hilit=USE CLOTHES HANGER TO MOVE AIRMIX LEVER

don't know if you are still trying to get heat but for a temporary fix check out link above.
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Troxartes
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Year and Trim: 1998 Pontiac Bonneville SSEi

Re: A/C, Heater problems-Hot in the Summer, Cold in the Wint

Post by Troxartes »

The car was low on coolant so I topped it off and now the heater runs great!

Thank you, guys, it's nice not freezing in my car anymore!
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MKMike
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Re: A/C, Heater problems-Hot in the Summer, Cold in the Wint

Post by MKMike »

Thanks for reporting back.
Always good to find out what the issue was.
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