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Tool Talk Discussion Forum

'93 Bonneville Not Heating Much

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Glenn F.

11-26-2010 02:43:12
64.109.36.40



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My trusty old Bonneville heats the interior just enough to make it tollerable. Thermostat is new and heater core had been flushed backwards. Temperature guage runs in normal range.

I figure the problem is with the heater door under the dash or some such thing. Is it a big job checking this out?


Thanks,
Glenn F.




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Hobo,NC

11-26-2010 17:56:20
98.16.9.187



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 Re: '93 Bonneville Not Heating Much in reply to RockyHawaii, 11-26-2010 02:43:12  
It may not run hot with a bad/worn water pump impeller unless you let it set and idle a long time,, most of the time bad impellers show up when I find a low to no heat condition soon as we get a hard frost...

Most of the time poor coolant flow is hard to detect till I have let it Idle for a long time while do'n a examination on the patient in 30 degree weather with wet feet... I charge for my examination before I give my diagnosis so I can live with the wet feet :D

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Hobo,NC

11-26-2010 17:40:45
98.16.9.187



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 Re: '93 Bonneville Not Heating Much in reply to Glenn F., 11-26-2010 02:43:12  
You need coolant to absorb the heat (think low coolant)

You need heated coolant (think 195 degrees)

You need coolant flow (unrestricted) verify theirs no restriction) restrictions do happen in the heater hose connector/connections

Coolant needs to have good flow and pressure ( unhook the inlet and check for a good flow,,, gotta keep the rad full while checking)

If alls good feel both the inlet and outlet hose they both should B very hot,,, if one side is hot and the other cold are warm you have a restricted heater core...

Common to a restricted core,,, shut the engine off and wait 3 to 5 min. start the engine up,,, if you have good heat for the first 30 to 60 sec. then tappers off the core is restricted.... you can test by feel of the air

If both are very hot and feel the same you have a air flow problem in the case.

Good heat is when the heater blows 140/145 degree air HI blower speed ,,, anything below that is not consider good heat... are not tolerable in most cases.
This post was edited by Hobo,NC at 17:46:13 11/26/10.

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sws55

11-26-2010 17:31:22
173.29.40.52



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 Re: '93 Bonneville Not Heating Much in reply to Glenn F., 11-26-2010 02:43:12  
Does your car have electronic climate control? I had a similar problem four years ago on a "96 Bonneville with climate control. The sensor on the Temp Mode" door went bad on it. On a cold start the interior only recieved a little heat at any time. On a warm re-start the heater would blow good hot air for less than a minute and then go back to only a little heat again.

The "Temp Mode" door directs air through the heater core or by-passes the air around the heater. If the sensor on the door is bad the computer sends the door actuator to a default position half way between either extreme, and you olny get a little heat.

At that time the replacement actuator and sensor part #16141822 was about $70. Unfortunatly the dashboard had to be removed to replace it. My local garage found the problem but didn"t want to mess with the dashboard.

The local GM dealer replaced it and charged 4 hours of labor.

Good Luck.

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sws55

11-26-2010 17:09:26
173.29.40.52



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 Re: '93 Bonneville Not Heating Much in reply to Glenn F., 11-26-2010 02:43:12  
Does your car have electronic climate control? I had a similar problem four years ago on a "96 Bonneville with climate control. The sensor on the Temp Mode" door went bad on it. On a cold start the interior only recieved a little heat at any time. On a warm re-start the heater would blow good hot air for less than a minute and then go back to only a little heat again.

The "Temp Mode" door directs air through the heater core or by-passes the air around the heater. If the sensor on the door is bad the computer sends the door actuator to a default position half way between either extreme, and you olny get a little heat.

At that time the replacement actuator and sensor part #16141822 was about $70. Unfortunatly the dashboard had to be removed to replace it. My local garage found the problem but didn"t want to mess with the dashboard.

The local GM dealer replaced it and charged 4 hours of labor.

Good Luck.

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Mike M (RI)

11-26-2010 10:12:00
108.12.251.154



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 Re: '93 Bonneville Not Heating Much in reply to Glenn F., 11-26-2010 02:43:12  
I had a '75 Catalina that had a bad water temp control valve that was stuck...located near firewall..heater hose & vacuum line goes to it...controls hot water to heater core on cars with AC. Don't know if '93 was still using them, but worth a check to see if stuck partially closed. Hope this helps, good luck.



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PJH

11-26-2010 08:24:38
71.171.214.43



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 Re: '93 Bonneville Not Heating Much in reply to Glenn F., 11-26-2010 02:43:12  
Glenn, on my '93 LeSabre, which I no longer have, the temperature door controls were pretty easy to get to by removing the glove box and the underdash panel. I never had any problems with that door or it's controls, but I did have a floating ground problem that made the air come out the defroster, then the AC vents, then the floor vents, etc., on it's own. Always coming out where you didn't want it. The repair part was EXPENSIVE, so I installed a little under dash rotary switch and solved the problem.

Paul

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VernMI

11-26-2010 07:17:49
209.86.226.24



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 Re: '93 Bonneville Not Heating Much in reply to Glenn F., 11-26-2010 02:43:12  
Water pump nearly worn out?



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Glenn F.

11-26-2010 07:36:10
64.109.36.8



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 Re: '93 Bonneville Not Heating Much in reply to VernMI, 11-26-2010 07:17:49  
Can't say, but wouldn't the engine run too warm then? Never overheats twelve months/year.

Thanks,
Glenn F. (NE WI)



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old

11-26-2010 08:02:05
4.245.5.78



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 Re: '93 Bonneville Not Heating Much in reply to Glenn F., 11-26-2010 07:36:10  
Pull the 2 coolant hose off the heater and switch them around. In a lot of heater cores they get clogged up and by switching them that way you push the clog out. Only problem is then you have crude floating around in the system. Seen that happen many times on my Chev's over the years



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challenger

11-26-2010 06:38:39
70.174.110.124



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 Re: '93 Bonneville Not Heating Much in reply to Glenn F., 11-26-2010 02:43:12  
I had a Chevy pickup where the hose couplings coming out of the manifold were all crudded up. They are made of steel and do what all steel does inside, corrode up with time. You may want to remove your heater hoses and check to see if you have water flow.



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Tom from Buckeye Lake

11-26-2010 06:34:48
99.174.172.76



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 Re: '93 Bonneville Not Heating Much in reply to Glenn F., 11-26-2010 02:43:12  
89 Chevy, I 3rd the heater door. My truck wouldn't heat the cab, cable off the door.



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El Toro

11-26-2010 04:11:06
108.3.200.96



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 Re: '93 Bonneville Not Heating Much in reply to Glenn F., 11-26-2010 02:43:12  
I had that problem on a 3/4 ton Chevy pickup. It had been used on construction sites before I bought it. I found over a handful of pencils and pens around that heater door. Nothing wrong
with the heater. Hal



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circus

11-26-2010 03:26:54
72.251.63.158



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 Re: '93 Bonneville Not Heating Much in reply to Glenn F., 11-26-2010 02:43:12  
Your probably correct about a flap not working. On my 89 Supreme, with automatic temp control, a sensor in the dash was shorted out. Trouble codes are accessable from the heater control. I've got the shop manual for the Olds but doubt that could help you.



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Ky Hauler

11-26-2010 06:45:17
74.241.53.239



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 Re: '93 Bonneville Not Heating Much in reply to circus, 11-26-2010 03:26:54  
I had a Dodge Dart like that. The heater hoses were crossed up. Go figger.



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motorcraftman

11-26-2010 17:18:07
74.176.168.148



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 Re: '93 Bonneville Not Heating Much in reply to Ky Hauler, 11-26-2010 06:45:17  
I Go with this Theory.. Larry



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Rustyj14

11-26-2010 08:16:35
108.17.91.17



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 Re: '93 Bonneville Not Heating Much in reply to Ky Hauler, 11-26-2010 06:45:17  
The older Chrysler made Mini-vans had a problem, where the door inside the heater box, under the dash, would get a little bit rusty and wouldn't turn like they should. I found out, that if you drilled a little hole in that box, in the left lower corner, and squirted a spray mist of WD-40, thru the little hole--it would free up the flapper, and you would get heat again! That hole was not near anything that could or would leak coolant.

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