"L"

I found a pattern in my over heating. Here's how it works. In the morning, what I do is drive it until it reaches normal temp and then shortly after that, I pull over at a gas station and cafrefully take the radiator cap off or I loosen it just enough for the cap to catch that notch that you have to press down to take the cap off. I don't take the cap off but just let the water and steam spew out. Then I take the cap off carefully with a towel or something and proceed to put water in until it reaches the top and I put the cap back on and start it and it's fine after that for the whole day. And I do this with the engine off of course. What is this the symptom of? When a car builds up pressure and steam, where does it suppose to go or what is it suppose to do?

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l4zy415

Sounds like you have air in the system. Do you see a lil bleeder that sits under the throttle? It's easy to find. When your car reaches normal temp, grab a hose that can fit on it and a bottle to catch the coolant, and start taking the air out. I think the reason why your getting air is because your using water. Water will evaporate faster than coolant. Make sure you use coolant instead of water.

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18" Limited 341 Chrome Rims/\Matador Red Paint/\Weapon R - Secret Weapon Intake/\LED Bright White Dash Lights/Floor/\Kenwood KDC-X590 Excelon Mp3 Deck/\Ford Taurus Coin/Cup Holder/\2 12" Kickers/\1200 Watt Sony XM-2200GTX 2-Channel Xplod Amp/\2 Rockford Fosgate Capacitors/\Power Acoustic Capacitor/\Clear Rear Turn Signal/\Reverse Glow Gauges/\Swapped 88' Headlights to 89'-90'/\JDM Rear Chrome Trim/\Stromung Muffler/
Soon To Come: Rebuild Motor and 5-MT Swap

"L"

The reason I'm not using coolant is because I think I have a BHG or head. Do you think this the symptom of either one of the two or what you said in your last post L4zy415?

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l4zy415

If you have a BHG, you would see your oil a bit milky or do you see any oil floating in the reserve tank or radiator? Other way to check if your sparkplugs a sqweaky clean.

EDIT: Just to be safe, go buy some coolant and drain out the water from the rad. Then pour in some coolant to see if you still get a pressure. Also forgot to mention, have you ever replaced the thermostat?

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18" Limited 341 Chrome Rims/\Matador Red Paint/\Weapon R - Secret Weapon Intake/\LED Bright White Dash Lights/Floor/\Kenwood KDC-X590 Excelon Mp3 Deck/\Ford Taurus Coin/Cup Holder/\2 12" Kickers/\1200 Watt Sony XM-2200GTX 2-Channel Xplod Amp/\2 Rockford Fosgate Capacitors/\Power Acoustic Capacitor/\Clear Rear Turn Signal/\Reverse Glow Gauges/\Swapped 88' Headlights to 89'-90'/\JDM Rear Chrome Trim/\Stromung Muffler/
Soon To Come: Rebuild Motor and 5-MT Swap

"L"

Yea, I have replaced the thermostat recently.

Well, when that happens with the build up of pressure, I do see a milky looking at the top of the oil cap. But afterwards, I look at it after I release the pressure at the end of the day and its not there. I just changed my oil last Wednesday and it looked fine to me. Black...like regular used dirty oil.

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l4zy415

That's weird. But I think the water is the problem.

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18" Limited 341 Chrome Rims/\Matador Red Paint/\Weapon R - Secret Weapon Intake/\LED Bright White Dash Lights/Floor/\Kenwood KDC-X590 Excelon Mp3 Deck/\Ford Taurus Coin/Cup Holder/\2 12" Kickers/\1200 Watt Sony XM-2200GTX 2-Channel Xplod Amp/\2 Rockford Fosgate Capacitors/\Power Acoustic Capacitor/\Clear Rear Turn Signal/\Reverse Glow Gauges/\Swapped 88' Headlights to 89'-90'/\JDM Rear Chrome Trim/\Stromung Muffler/
Soon To Come: Rebuild Motor and 5-MT Swap

TO90LEGEND

Just a question but are your fan(s) working ok? When your car starts to overheat try to turn on the A/C that forces both fans to come on. Just as a test to see if things cool off.

Ken

id suggest flushing your system and using 50/50 distilled water and coolant. bleed it correctly twice maybe, then drive around to see what happens. Ohh yea, also try a new radiator cap. how are your hoses and seals? any leaks? was the car overheated before?

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. k e n

Parting out a 91 L 5-speed, let me know if you need any parts besides engine and 5-speed parts. The car is Rosewood brown with type E cloth interior.

"L"

So nobody thinks its a BHG cracked head and that I just need to bleed it, chang some old hoses if I had some, change rad cap which I did, use 50/50 and the other stuff you mentioned?

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r3dw00d

Hi L,

I have a G2, but I have had similar symptoms with my new coupe.... overheating, then sometimes its good, especially after pressure (air) is released from the system.

Mine DID have a BHG, but the symptoms were almost non-existent, a hydrocarbon test showed it was blown. BUT, what you are experiencing is more likely a warped or cracked head. Here is how mine worked:

I would drive and it might overheat, I bleed and refill, then I am ok. After 30+ minutes of driving, temp is normal and I park and turn off car. The head heats UP now, cause there isn't coolant circulating, the warped head lets in air. Next time I get in the car, air bubble makes car overheat again...

You would think the head would cool down after you turn the car off, but since there is no coolant circulating it actually heats up, whatever crack/warp you have expands, air comes in... you know the rest.

I just put in another type I motor, radiator, thermostat, fan controllers, and did a good bleed. No more overheating.

Good luck...

"L"

That sounds about right R3d. I guess I just have to bite the bullet and get another. Thanks everybody!

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sam o nela

If you are concerned about a BHG....get a pressure and chemical test done to either confirm or bust your suspicions...

Another way to bleed is to park the car up a little incline (like on a driveway, a couple 2x4's, jackstands, etc....as long as the radiator cap as the highest point) then start the car with the radiator cap OFF completely AND the heater turned up to FULL....

As the car runs, massage the upper hose and give it some pinches until you see no more air bubbles popping out...when theres no more air, the coolant level in the neck with rise and fall with each squeeze of the hose...

Now repeat the process for the lower hose....especially after the thermostat opens up (the hose will go from cool to hot very quickly) and rev the engine a little from the throttle body to flush out any residual air....

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"L"

I forgot to mention that I did had a hydrocarbon test done and it came back negative or inconclusive. And I had a leak test done and it cam back negative.

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sam o nela

Lol then I wouldnt worry about it....try bleeding the system completely free of air...

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<Monocolor Paint Scheme> <JDM Clear Corners> <Cleared out Rear Turn Signals>
<Acura Caliper Grill Emblem> <Independent Yellow Fog Mod> <15% Tint>
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"L"

I try and see what happens. I rerouted my heater hoses to connect to each other because I thought my heater core was blocked so I won't be cutting on any heat right now until I put the hoses back. But I ran high pressure water thru there and it came out on the other end so thats how I know its not blocked. But I'll post back on this thread and let you know the results.