92 Bonneville no heat - 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 02-14-2012, 04:07 PM   #11
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I dont have a vacum gauge but when i disconnected it last night it seemed week. The hoses going from the engine to the vacum regulator are bad so I am going to change those tonight.
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Old 02-14-2012, 06:08 PM   #12
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That could very well be part of the problem.
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Old 02-16-2012, 09:00 PM   #13
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Hey not sure if this is an issue or not but notice when the A/C was running that I could feel the air on the outside of the window bing drawn in like the defroster is on but no heat still. Any ideas.

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Old 02-28-2012, 01:58 PM   #14
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Okay still no heat replaced the Vacum line connections under the hood. Neither of the heater lines are getting warm so not sure whats going on.
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Old 02-28-2012, 03:55 PM   #15
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Originally Posted by JoshuaBonnie View Post
Okay still no heat replaced the Vacum line connections under the hood. Neither of the heater lines are getting warm so not sure whats going on.

Which heater lines are you referring to? Is this the inlet and outlet hoses that feed coolant into the heater core from the engine bay? If they aren't getting hot you have a blockage in the heater core.
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Old 02-28-2012, 04:01 PM   #16
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The 2 heater hoses going into the firewall are not getting warm? Either your heater core is clogged to the point where coolant from the engine is not even getting to the core, or your having water pump issues.

Best way to see if heater core is clogged(IMO) is to disconnect both heater core hoses from engine and connect garden hose to one of the hoses. Slowly turn water on just a little bit and check for flow from other hose. If you start seeing water squirt out at your connection, turn water off. You have a blockage.
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Old 02-28-2012, 04:22 PM   #17
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Thanks I did a flush on the heater core under pressure and it flushed pretty good and flowed smoothly now there was a lot of stuff that came out though. I can try a flush again to double check. Does any one know how difficult it is to remove the heater lines from the block and check those for blockage.
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