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Old 03-13-2006, 08:50 PM   #1
maniacmonkey
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will not warm up

Hi all, I was hoping someone could help me with a problem I have with my 89 sunbird. I can't get it to warm up. The engine temp needle doesn't move off the cold line unless it is sitting at idle for a while and once I start moving it quickly returns to cold. It only gets a little warm inside the car, just enough to take the chill out of the air. I just replaced the thermostat today and that made next to no difference. The needle now just crawls off the cold line but not by much.

Thanks in advance
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Old 03-13-2006, 10:04 PM   #2
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Thermostat?
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Old 03-13-2006, 10:39 PM   #3
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Yes, thermostat, the thing that holds coolant in the engine until it is warm enough to move to the rad. Was this not the right thing to replace?
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Old 03-14-2006, 01:31 AM   #4
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Quote:
Originally Posted by maniacmonkey
Yes, thermostat, the thing that holds coolant in the engine until it is warm enough to move to the rad. Was this not the right thing to replace?
Sounds like a good start. Maybe your radiotor is out of wack, but that would make the car overheat if anything...cant say much more here....
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Old 03-14-2006, 03:39 AM   #5
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thermostat.............

Are you using the proper degree thermostat?
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Old 03-14-2006, 04:44 AM   #6
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I put in the hottest running thermostat to try to make it heat up.
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Old 03-14-2006, 05:44 AM   #7
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And not to be an ass, but your coolant level is full?
No leaks? Maybe the heater core has a blockage. But you also say your gauge doe not move. And that I would guess is in the block. Do both upper and lower hoses get hot?
I am trying to understand your situation.
This is weird.
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Old 03-14-2006, 08:45 AM   #8
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I think your engine warming up, but your temp guage is dodgy, as if you keep your engine running...it can only keep on getting hot, untill eventually it overheats...if the fan doesn't cut in!

I would have said the thermostat too. Are you sure the fan's working? as if you drive down the road, some vehicles get cool enough with just the outside air flowing through the radiator grille! Run it at idle and verify this, if it's falty, you could have an air lock, or a bad fan switch...or even a blown fuse!

The fan switch is usually on the bottom of the radiator, you can check it's operation by using a split pin or somthing similar to bridge the circuit (join one end to each of the contacts of the wire that plugs into it), if the fan comes on...you know the switch is at fault!

To check for an air lock, simply feel all the radiator hoses and if any are cold...that's your problem. Some cars have a bleed nipple on the engine, others are self bleeding. If yours is of the former, locate the nipple when the car's running, open it, let the air out, and reclose it. Simple lol.

It might be worth noting that if you diagnose any of the above, technically the car should overheat at idle atleast
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Last edited by Cliffy : 03-14-2006 at 08:49 AM.
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Old 03-14-2006, 10:04 PM   #9
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Thanks for the feed back. I will try the suggestions and get back to you.
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Old 03-15-2006, 01:42 AM   #10
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The upper hose is hot, and the lower hose is warm. Does this sound like air in the system? Oh, yes the fan does work.
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Old 03-15-2006, 05:12 PM   #11
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Quote:
Originally Posted by maniacmonkey
The upper hose is hot, and the lower hose is warm. Does this sound like air in the system? Oh, yes the fan does work.
If the fan cuts in automatically, you wont have an airlock. Sometimes not all of the hoses get extreamly hot. Seeing as how you say the lower hose is warm, this sounds fine anyway.
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