Car Trouble - Automotive Repairs - DIY Chatroom Home Improvement Forum

Go Back   DIY Chatroom Home Improvement Forum > Do It Yourself > Automotive Repairs


Closed Thread
Thread Tools Display Modes
Old 02-16-2010, 12:54 PM   #1
Join Date: Feb 2010
Posts: 2
Rewards Points: 10

Car trouble

My 1998 Olds Bravada is producing lukewarm/cool air through its air vents, and the air doesn't get hot. What things should I check in order to determine the problem, and what is the most probable culprit?



Last edited by Justaguy; 02-16-2010 at 12:58 PM. Reason: To correct spelling.
Justaguy is offline  
Old 02-16-2010, 03:04 PM   #2
Join Date: Mar 2007
Location: Long Island, NY
Posts: 11,188
Rewards Points: 5,336

When was the last time the coolant was flushed and replaced? Could be a clog in the hose to the heater box. Is the fan blowing the same as it did before? If the adjustment to the heat is mechanical, it could have come loose. If it's a vacumm adjustment, one of the tubes could be disconnected or clogged. Has anyone worked on the car recently?


Ron6519 is offline  
Old 02-16-2010, 07:40 PM   #3
Safe, Most of the Time!!
brokenknee's Avatar
Join Date: Dec 2008
Location: MN
Posts: 652
Rewards Points: 500

Make sure you are not low on coolant.
"Clarity to Agreement" Dennis Prager

Picture/Photo Pitcher/Carafe ------- Where/Someplace Were/Be
brokenknee is offline  
Old 02-16-2010, 08:46 PM   #4
Join Date: Oct 2007
Posts: 204
Rewards Points: 150

I've had similar issues when there was a clogged heater core.

After you check all the easy stuff,

Locate the coolant lines heading through the firewall to the heat exchanger under the dash. Disconnect both in/out lines from the motor if you can or install T-fittings (you can get them in the prestone flush kit for $3.00)

hook a garden hose upto one, a drainage hose into a bucket on the other. Flush until a big snot shoots out and until the water runs clear. Do the same in the other direction.

Flush the rest of your coolant, refill will fullstrength + DISTILLED water.

Worked for me.

Last edited by johnnyboy; 02-16-2010 at 08:50 PM.
johnnyboy is offline  
Old 02-17-2010, 01:42 AM   #5
Join Date: Sep 2008
Location: Oregon
Posts: 1,497
Rewards Points: 500

The temperature gauge for the engine should be about in the middle of the range when the engine is warm. If it is indicating cooler, then replace the engine coolant thermostat.

Also there can be multiple problems. The temperature gauge for the engine can also be reading wrong. The cause of this is usually the "temperature sender". (NOT the engine coolant temperature "sensor" which is for the engine computer!) Then when you fix this, you might then see the temperature is too cool, then realize you also need a thermostat.

And there can be a third problem. The radiator may be clogged and the engine was overheating in the summer, so someone removed the thermostat to get it to cool better! For this new radiator and reinstall thermostat.

The engine thermostat should keep the water circulating hot. Even better is to use a factory service manual along with a thermometer and measure the temperature of the water. Should be what it says in the vehicle factory service manual set.

Anyway once you are sure the water is hot, then also the above about the water being able to circulate through the heater core can be a problem. (As they said above.)

And then there can be a problem with the little "door" in the HVAC system which switches from hot to cold (blend door). If you have an electronic HVAC system, do the following...

Try a "reboot"!

Remove a battery terminal for 10 minutes, then reconnect.

Turn ignition switch to on, but don't start.

Wait 1 minute.

DO NOT touch any buttons in the vehicle during this minute.

Then start vehicle and let idle for 5 minutes.

Drive above 45 mph as soon as possible.

This "reboots" all the computers in the vehicle including the A/C which then "resynchronizes" the actuator doors during the power-up.

This also reboots the engine computer and the idle and driving above 45 mph helps it to "regain" its operating memory.

If this does not work, you would need a GM Factory Service Manual set which would have complete troubleshooting instructions for this problem as well as complete part replacement procedures. Order from or a GM dealer.

You would also need to know how to use a multimeter along with the instructions in the manual. How to use a multimeter...
Billy_Bob is offline  
Old 02-18-2010, 02:54 AM   #6
Join Date: Feb 2010
Posts: 9
Rewards Points: 10

not being funny m8
but what have you actually checked/done?

you cant ask a question like that without some kind of info?

have you had a look under the bonnet if so what at?

cmon help us to help you

Originally Posted by Justaguy View Post
My 1998 Olds Bravada is producing lukewarm/cool air through its air vents, and the air doesn't get hot. What things should I check in order to determine the problem, and what is the most probable culprit?

jaye944 is offline  
Old 04-14-2010, 12:17 PM   #7
cowboy dan's Avatar
Join Date: Apr 2010
Posts: 77
Rewards Points: 75

i have seen alot of that on alot of cars. one i might check is that the blend door on your heating box is working. some are mechanical and some are electronic. ford and gm do that alot
cowboy dan is offline  
Old 11-06-2010, 04:43 PM   #8
Join Date: Nov 2010
Posts: 10
Rewards Points: 18

Three things,

Enviromental controls not working properly

Heater core is partially plugged

Antifreeze level is LOW..warning sign is low heat or no heat comming out of vents.
lorel is offline  
Old 11-08-2010, 09:14 PM   #9
Join Date: Feb 2010
Location: norman, ok
Posts: 53
Rewards Points: 35

It could be a stuck open thermostat. I had this happen on my truck took forever to warm up and when it did the temp was really low and not much heat. If you haven't done it anytime soon, thermostat are cheap, change it out you should do it once a year at least. Mine the reason it stuck open was it got hung up on the side and it kept it open.
dirtrider73068 is offline  
Old 11-08-2010, 10:13 PM   #10
Join Date: Jan 2009
Location: South of Boston, MA
Posts: 17,248
Rewards Points: 2,000

Hopefully almost 9 months later its fixed


Scuba_Dave is offline  
Closed Thread

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Just enough knowledge to get into trouble captain25 Introductions 1 03-23-2009 01:30 PM
Heil Gas Furnace has trouble starting sometimes dmanmtl HVAC 3 01-23-2009 05:36 PM
led trouble light TAKE PRIDE I.Y.W Electrical 8 12-07-2008 10:36 AM
P0420 trouble code Bad gas milage Help!!! lemoncoke Automotive Repairs 3 10-05-2008 08:50 AM
Arc Fault Trouble Shooting michael byrnes Electrical 4 06-13-2007 04:24 PM

Top of Page | View New Posts


Search Engine Friendly URLs by vBSEO 3.6.1