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Overheat


DAWGSLIFE
08-12-2005, 08:54 PM
I have a 1990 900 turbo always gets very hot when idling. I replaced the water pump, thermostat, coolant, temp sending unit. I took out the thermostat and it still overheats. The temp gauge climbs to just below the red. When I open the bleeder valve near the thermostat, I keep getting alot of air. ANY HELP WOULD BE GREATLY APPRECIATED!!!

mbunakeith
08-18-2005, 03:27 PM
you should be able to watch coolant trickle out of the petcock at the thermostat if the reservoir is full. sounds like you have a nasty airbubble in there. i have worked on 900's for a long time and have never had a bubble in one. you probably have a blown headgasket, which is pushing exhaust in the cooling system. do you have access to a block tester? it is a device you put in the opening of the reservoir, you put a chemical in the device and it will turn colors if it detects exhaust gasses in your coolant. this will prove it for you. i assume you have a bunch of dried coolant around the turbo flange. that is also a good indicator of headgasket problems.

DAWGSLIFE
08-26-2005, 04:25 PM
Thanks for the info. Do you know of any type of additive that I can use in the oil or coolant to resolve this problem? I really don't want to pull the head off. When I added the coolant back in it only took one gallon. Is that normal?

mbunakeith
08-29-2005, 03:41 PM
that head needs to come off. i am sorry. there is nothing that will fix it other than a new head gasket. as for how much coolant it took; i cant answer that because i dont know exactly what is going on. if it burps all of your coolant out after running a while, but not overheating, it may burp a liter or 4 liters. i dont know.

DAWGSLIFE
08-29-2005, 04:56 PM
thanks again for the info it has been very helpful. I better get the manual out for this one.

bunyz06rabbitt
09-28-2005, 06:48 AM
hello dawg, i know this is a late post and not much activity here in saabland but i didn't see you mention anything about changing the radiator or having it rodded out. have you found a solution to your problem? the car seems pretty old and the radiator could be all clogged up. an honest radiator shop could help you.

mbunakeith
10-04-2005, 03:18 PM
rabbit may be on to something there...didn t think of plugged radiator.

bunyz06rabbitt
10-04-2005, 06:23 PM
Yup, 15 years and no amount of flushing is gonna clear up mechanical blockage. So hey dawgslife, any conclusion to your dilemna? Let us know! :smile:

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