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Old 06-25-2010, 02:08 AM   #1
blkmrideon22s
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91 honda prelude 2.0 si

i just brought a 91 honda prelude 2.0 si and my car is overheating. well ive have change the thermostat but that didnt help. i was told it could be a head gasket that could be causing the car to overheat. how hard is it to change a head gasket? also when i put my key to crank my car my transmission lever wont move unless in put my in the lever release hole. could there be something stuck that could be causing this?
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Old 06-25-2010, 03:41 AM   #2
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overheating problems

Is there white smoke out the tail pipe? Is there water in the oil or vice-versa ? Those are signs of blown head gasket. "Leak Down Test" best way to check problem. Also check "Thermo Sensor", a sensor on the bottom of the radiator that could cause problems. Get a 'new' one from the Honda dealer.... Replacing head gasket; Head needs to be pulled and checked by a machine shop for warpage/cracks and valves/springs. While your doing that, change timing belt and water pump $250oo for parts & mach. work + any labor.

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Old 06-25-2010, 10:08 AM   #3
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If you drive a car while it overheats, it may blow the head gasket. So, if it is overheating and the headgasket is not bown now, it will eventually blow unless you fix the problem.

Check these things:
- coolant level and proper 50/50 mixture
- coolant leaks
- bleed the air from the coolant
- radiator fans come on at proper time

As for the clutch problem, please try describing it more clearly.
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Old 06-25-2010, 11:10 AM   #4
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there is no water in the oil and there no white smoke coming out my tail pipes. i fixed my transmission problem.
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Old 06-25-2010, 12:32 PM   #5
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Quote:
Originally Posted by blkmrideon22s View Post
there is no water in the oil and there no white smoke coming out my tail pipes. i fixed my transmission problem.
There is coolant relay under the passenger's kickplate located forward of the passenger's door under the dash.
If you don't have a blown headgasket yet, and still run it, the coolant relay may not be engaging. a new one will run you about 100+ from honda, but a you-pull-it yard may have one for about 30 buck...
the sensors in the bottom of the radiator or the block may be going bad (as Danbrick has mentioned). There is also another one to the right of the thermostat on the front of the block near the coolant bleed valve.

Does your fan come on at random times even when the car is cool? If it does this means your coolant relay is Going bad...it may have already failed...

Check all the items Triplelude has suggested and then start with the sensor plugs before you go to the relay sensor.
Did you install a fail-safe Thermostat? if it fails it will fail in the open position. Maybe you got a bad one...?
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Old 06-25-2010, 01:14 PM   #6
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Please don't tell him to replace relays and thermo switches before you even find out if the fans are coming on or not. $30 for a relay form a pick-a-part? They're robbing you. My local junkyard sells all relays and switches for $2 each.

I'm not sure why people always jump straight to the head gasket as being the problem before troubleshooting the problem properly. The head gasket usually doesn't cause the overheating problem. Most of the time, the head gasket fails because the engine overheated, as Trip said. Follow his advice and find out what the problem is before changing any parts out.
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should have posted this in the noob thread.
Link to noob thread...

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Old 06-25-2010, 02:01 PM   #7
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Didn't mean to jump and start replacing parts, 'especially' head gasket. There are so many minor things it could be. As Luzer says make sure your fans are working and coming on at the right time, radiator has flow, not cracked. Check fuses/relays..Even that thermo sensor is a semi last resort, as it costs $60 from the dealer. Just don't drive it !! On your path, step on the small stones first.

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Old 06-25-2010, 02:59 PM   #8
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Originally Posted by luzer View Post
Please don't tell him to replace relays and thermo switches before you even find out if the fans are coming on or not. $30 for a relay form a pick-a-part? They're robbing you. My local junkyard sells all relays and switches for $2 each.

I'm not sure why people always jump straight to the head gasket as being the problem before troubleshooting the problem properly. The head gasket usually doesn't cause the overheating problem. Most of the time, the head gasket fails because the engine overheated, as Trip said. Follow his advice and find out what the problem is before changing any parts out.
My bad...i was just covering all the bases as i just had to track this same problem down and it ended up being the underdash relay.
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Old 06-25-2010, 03:25 PM   #9
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check it
http://preludepower.com/forums/showthread.php?t=333212
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Old 06-25-2010, 05:04 PM   #10
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I'd say first step is check for coolant leaks (leaking hose, water pump). From there bleeding the coolant system is probably the next step. After that check radiator for blockage. After that fans, relays etc.

Good luck.
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