asdf56 Posted September 7, 2004 Share Posted September 7, 2004 Hope someone can figure this out as I surely can't!! I have a 1992 loyale with low miles and an automatic and it has the most voodoo problem: drive around town (30-50 mph) no problem; take it on the interstate (65-70 mph, 4000 rpm) no problem until AFTER you slow down (i.e. go into a residential area) then it starts to heat up rapidly. When you stop the radiator is cool but the motor is hot!! It's not the thermostat (I have a 180 in it) as I have replaced it 2x. when you crack the radiator cap the coolant rushes into the radiator and it is good to go. Heap of thanks!! Link to comment Share on other sites More sharing options...
MorganM Posted September 7, 2004 Share Posted September 7, 2004 Sounds like heat soak. Driving at higher speends puts more demand on your engine and coolant system to keep it cool but the higher air flow really helps. Now you pull off the highway, engine is still HOT, and the air flow dlrops considerably. The heat 'soaks in' and builds up! This is where your fans come in. Do you still have your OEM clutch fan on the water pump? Does your auxilary electric fan kick in? If not that would be the first place to start. Also look at yoru radiator and make sure all the fins and tubes are in good order. Look from inside the engine bay, between the clutch fan and the radaitor itself. If you look from the outside all you will see is your AC condenser that looks like your radiator but really is not. NO fins should be missing! It should not be all rusty or scaled up in a green nasty color. If you see lots of fins missing then it's time for a new radiator. Start there and report back Link to comment Share on other sites More sharing options...
Cougar Posted September 7, 2004 Share Posted September 7, 2004 It sounds to me that the radiator is building up excessive pressure somehow. Possibly from a headgasket leak. I would get a block check done to see if exhaust gases are getting into the coolant. If that is ok then changing the radiator cap may help solve this problem. Link to comment Share on other sites More sharing options...
bushbasher Posted September 7, 2004 Share Posted September 7, 2004 sounds like rad cap is not venting Link to comment Share on other sites More sharing options...
asdf56 Posted September 7, 2004 Author Share Posted September 7, 2004 Not the radiator cap, I just replaced it. seems to me that if it were the headgasket I'd be loosing coolant, which I am not. Could water pumps on subarus possibly do this? Its not leaking and there is no play in it. Thanks! Link to comment Share on other sites More sharing options...
MorganM Posted September 7, 2004 Share Posted September 7, 2004 Did you check the condition of your radiator? Do the fans function properly? VERY key components to keeping the car cool. Fix this before you DO blow a head gasket. Very easy to do. I would not over heat this car! And by over heating I'm talking going over the half way point. If it hits the red its too late; youve over heated it bad! Link to comment Share on other sites More sharing options...
SubaSkeet Posted September 8, 2004 Share Posted September 8, 2004 got a similar cooling problem, only difference is it heats up to almost red even when just cruising at approx. 85-90 mph on freeway for no more than 15 mins. rpms at that speed are about 4000-4500, rad. and cooling fan working correctly. could the coolant not be getting circulated? checked the engine w/ a laser temp. reader, and reads about 210 degrees after driving around for a while (almost near the red at some points), so its probably not the therm. any ideas? also, how much of a cool down would i get if i mounted a wrx sti hood scoop on it? crap, sorry for hijacking thread. delete if necessary. Link to comment Share on other sites More sharing options...
asdf56 Posted September 8, 2004 Author Share Posted September 8, 2004 A hood scoop wont help, not enough heat transfer to cool it down. Only thing I can come up with is there is some sort of hot and cold circuit for the coolant i.e. when it heats up and when it is at temp the flow is different... Link to comment Share on other sites More sharing options...
Frank B Posted September 8, 2004 Share Posted September 8, 2004 Is the water pump pumping? Can you see the coolant flowing thru the rad as the engine is running? I hate to ask, but is the thermostat installed properly? The large end with the spring mounted towards the engine? Did you get all the air out when you filled up the cooling system? Are any of the hoses collapsed shut(flat) before you open the rad cap? Link to comment Share on other sites More sharing options...
Frank B Posted September 8, 2004 Share Posted September 8, 2004 Oh yea, is it a turbo?? Is the water pump pumping? Can you see the coolant flowing thru the rad as the engine is running? I hate to ask, but is the thermostat installed properly? The large end with the spring mounted towards the engine? Did you get all the air out when you filled up the cooling system? Are any of the hoses collapsed shut(flat) before you open the rad cap? Link to comment Share on other sites More sharing options...
MorganM Posted September 8, 2004 Share Posted September 8, 2004 Good questions Frank. Important things to look at there. Skeet: a hood scoop is not a solution to an overheating problem. Something is not functioning properly or is broken. A repair is required. My EA82 SPFI stays cool with only the auxilary electric fan, no clutch fan, no hood scoop, no oil cooler. First track down the problem. Lots of trouble shooting things to try listed in this thread. Link to comment Share on other sites More sharing options...
SubaSkeet Posted September 8, 2004 Share Posted September 8, 2004 negative on the turbo. reg. loy '92 ea82 spfi. Is the water pump pumping? yes, just got this replaced not three months ago at a shop, so i couldnt screw it up Can you see the coolant flowing thru the rad as the engine is running? i'll get back to you on that I hate to ask, but is the thermostat installed properly? The large end with the spring mounted towards the engine? si mi amigo Did you get all the air out when you filled up the cooling system? as far as i know. if not i rode all the air out. unless there's clogging somewhere in the hoses or rad. Are any of the hoses collapsed shut(flat) before you open the rad cap? not to my knowledge. will check. morgan: the reason im doing the sti scoop is because i have a huge dent right in the middle of my hood, so the 'airflow' would only be a byproduct of the hood ornament, should there have been any flowage. gracias both of yall for the help. Link to comment Share on other sites More sharing options...
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