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overheating issues

 
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Old 06-17-2011, 12:57 AM
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Icon5 overheating issues

ive had my 1990 si with the b21a1 for a few weeks now but the guy i bought it from said there was an overheating issue. i didnt notice anything happening while i was having it registered and all that but then the clutch went out so i sent it to my mechanic. long story short, after i got it back from my mechanic he told me he did a block sealing procedure because there was an exhaust leak in the coolant and i didnt want it to be so bad that it would blow the head gasket, that seemed to work for a couple weeks but today i noticed it heating up but it only heats up when i put accessories on like the ac and (no joke) the headlights.

any ideas on whats happening?
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Old 06-17-2011, 11:16 AM
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Re: overheating issues

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Originally Posted by 90si19 View Post
ive had my 1990 si with the b21a1 for a few weeks now but the guy i bought it from said there was an overheating issue. i didnt notice anything happening while i was having it registered and all that but then the clutch went out so i sent it to my mechanic. long story short, after i got it back from my mechanic he told me he did a block sealing procedure because there was an exhaust leak in the coolant and i didnt want it to be so bad that it would blow the head gasket, that seemed to work for a couple weeks but today i noticed it heating up but it only heats up when i put accessories on like the ac and (no joke) the headlights.

any ideas on whats happening?
Wait, what? What kind of block sealing procedure did your mech do? There's only two ways for the exhaust and coolant to mix, and both are pretty bad. Either a blown head gasket (most likely for you) or a cracked head or block. Check your coolant level. Also look at the coolant and see if it looks "normal". If it's low, fill it back up with the engine off. Then start the car with the radiator cap off and watch the radiator opening. Look for bubbles. If you see lots of bubbles or if coolant is being pushed out of the radiator you have one of the two problems I mentioned above.

You could also do a compression test and maybe even a leak down test to help diagnose a head gasket problem.

FYI: Turning on the headlights puts more of a load on the alternator which puts more load on the engine. So it's not surprising to me that your engine is overheating when you turn the headlights on if you are already having overheating issues.
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Last edited by luzer; 06-17-2011 at 11:19 AM.
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Old 06-17-2011, 03:08 PM
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Re: overheating issues

thanks, i already filled up the coolant and that seemed to help when i first got it. he did a procedure which i believe used the duraseal block sealer which seals any cracks in the block. I'll try out what you said and i was also thinking of flushing the radiator
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