Heater problem Bonneville SE 1988 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 01-26-2006, 02:27 PM   #1
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Default Heater problem Bonneville SE 1988

My Bonneville SE is from 1988. It has a manual heater/AC. The heater will not blow hot air. I bought a new cell but it did not help. Everything seems to work but no hot air. It blows cold and mildly warm air. I wonder if anyone can tell me what I should do. You see I live in Europe and one guy tried to figure out the problem but he was puzzled. It seems I need good ole American knowhow. Thanks in advance.
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Old 01-26-2006, 02:42 PM   #2
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How old is the thermostat?

You may want a 195F thermostat, as well you will want the O-ring that goes around the thermostat housing and the one that sits below the thermostat housing, if you do not have the one that sits below the thermostat housing the coolant can bypass the thermostat to a certain degree causing the engine to heat up very slowly also giving you a lot less heat

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Old 01-26-2006, 04:08 PM   #3
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In Canada here you have to get the bottom gasket from the dealer , local shops only have the upper O ring gasket.I just called dealer cause im using old one and they said it only comes with housing ,called another dealer and they have 2 for about 2bucks.
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Old 01-26-2006, 06:46 PM   #4
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Thank you!
I appreciate your advice.
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Old 01-27-2006, 11:59 AM   #5
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Where is your temp gage reading when you experience low heat?
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Old 01-28-2006, 01:42 PM   #6
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Between 40 and 0.
Thanks for your concern.
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Old 01-28-2006, 02:22 PM   #7
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I'm no expert, but it sounds like the thermostat could quite possibly be broken. They can get stuck either open or shut, and yours could be stuck open.

And everything else that jr's3800 already said
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Old 02-01-2006, 01:49 AM   #8
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You can do a simple analysis to give you an idea of what might be wrong. After the car has been running for a while, feel the top radiator hose. It should be nice and hot. Also feel the hoses that run to and from the heater core.

If the heater hoses are both hot, that means that hot coolant is circulating through the core and the problem is not the thermostat, or the heater core, but in the air flap or door that directs air to pass through the heater core and into the cabin.

If the radiator hose is hot but both heater hoses are cold, you've got no coolant flow through the heater core. This could be caused by low coolant or an air bubble that is blocking flow, or a plugged heater core.

If one heater hose is hot and the other is cold and you are not getting any heat out of the ducts, then there is a restriction of flow.

If your thermostat is stuck open or not letting the coolant heat up, you should notice that the top hose to the radiator never gets really hot. Check the hoses on a car with a heater that is working well and you will see what I mean.

Be careful where you put your hands when the engine is running, and don't let your clothing or hair dangle around moving belts!
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Old 02-07-2006, 04:36 PM   #9
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Thanks Bill!
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Old 02-09-2006, 04:00 PM   #10
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ok i know this thread is like 3 days old, but
i had the same problem, and it was my thermostat. i only put a 185 and its fine maybe i will pop in a 195 soon
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