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1991 SI Owner!

 
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Old 08-14-2015, 08:27 PM
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1991 SI Owner!

I got a 1991 Prelude SI, non-4WS, it is red. Got it as a mechanics special, and I'm currently trying to fix what is wrong with it:

Radiator fans won't kick on - already read the thread on the sensors, gonna go ahead and replace them all as they're all looking very dirty. One question I have is, where is the sensor on the radiator exactly? I can't find it.

Oil leak from drain plug... gonna try changing the oil and putting in a new crush washer - if its cross threaded though I'll need to source a new oil pan.

AC doesn't work, compressor clutch grinds when engaged which tells me its seized. Is there a service or someone here willing to rebuild the compressor for me, or else a place to get a cheap R134A compatible compressor? I plan to change out everything though eventually.

Carpet is frayed and shredded.

I dunno if I'm gonna keep this car or flip it once I fix this stuff, but I dunno. Its got good bones, the engine runs well ( its been replaced I think, it has a b20a5 ) and the transmission, while automatic, is running fine.

Anyways I'm happy to be here. Hoping to get some good info on this baby.
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Old 08-14-2015, 08:58 PM
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Re: 1991 SI Owner!

Pretty sure the fan temp sensor is at the very bottom of the radiator on the passenger side on the back side.
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Old 08-14-2015, 11:16 PM
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Re: 1991 SI Owner!

^^To be more specific, the fan switch is next to the lower radiator hose outlet.
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Old 08-15-2015, 12:15 AM
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Re: 1991 SI Owner!

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Originally Posted by Kazuo View Post
AC doesn't work, compressor clutch grinds when engaged which tells me its seized. Is there a service or someone here willing to rebuild the compressor for me, or else a place to get a cheap R134A compatible compressor? I plan to change out everything though
Our ac compressors are R134a capable. If your going to use R134a you need to change every o-ring in the system because R134a will leak through the rubber designed for R12. You should also flush the system with ac flush and change the accumulator along with the compressor to remove as much oil as you can. The PAG oil used in R134a is not compatible with the mineral oil used in R12. For this reason when doing a retrofit you should use ester oil as it is compatible with both. When charging with R134a into a R12 system you only charge to 80%. So since our cars use 2lbs of R12, they will use 1.6lbs of R134a. With R12 you will see pressures of 150hs and 30ls at about 80*f ambient temp. With R134a your pressures will be similar but expect to see the ls slightly higher. Watch the sight glass, as you approach the proper charge you will see all the bubbles disappear and the sight will become clear. If you are going to use R134a know that it is less efficient than R12. I hate to push a product, but if you use 2oz of ice32, your R134a performance will be closer to that of R12, and if used with R12 will be closer to R22 (industrial freezer refrigerant). I know that is allot more than you asked, but I hoped it helped.
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Old 08-15-2015, 12:22 AM
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Re: 1991 SI Owner!

In 91 there was two different si models. If its a 2.0si, that could be the stock engine because they used the b20a5. If it is just Si, than yes, it has been changed because the stock engine would have been a b21a1
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Old 08-15-2015, 10:47 AM
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Re: 1991 SI Owner!

Hey guys,

Lud8890, I'll research the VIN of mine and see if it's either model, but it only has an SI badge. Good to know the compressor is R134a compatible. I'll see if I can source R12, as I know a few backyard AC mechanics who possessed some of the stuff until recently. I'll also see if my friend who does AC systems can assist with the project.

Does anyone know the best source for either a new or rebuilt compressor? All the ones I've found are in excess of $300.

I'll do the oil today and try to get those sensors out so I may order new ones.
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Old 08-15-2015, 11:29 AM
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Re: 1991 SI Owner!

Sounds like a fun project


I have 110lbs of r12
250lbs of r22
75lbs of r410a
And 25lbs of r134a
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Old 08-15-2015, 01:02 PM
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Re: 1991 SI Owner!

btmnz!
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Old 08-15-2015, 02:45 PM
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Re: 1991 SI Owner!

Yeah BTMNZ won't work as I'm in the US. I found a few leads in my local classifieds. I'm gonna replace almost everything except any non leaking hoses, as I verified vacuum leaks in the condenser and evaporator. I'm gonna get a non AC compressor belt and install it so I can take apart the system, check the hoses for leaks and yet still drive it. Gotta call local junkyards for an oil pan, this one is shot :(.

Update: started taking out the radiator, found a bunch of corrosion around the sensor, so going to remove the fans and radiator. Gonna try last ditch on the drain plug, see how far I get, and tap new threads into the pan if possible. No junkyards nearby have one. Will also rip out condenser, dryer, expansion valve, and compressor and hoses while I have all this crap out of the way.

Not bad for a first restoration project lawl. Anyone got a good source for the AC stuff?

Last edited by Kazuo; 08-15-2015 at 09:03 PM.
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Old 08-16-2015, 12:28 AM
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Re: 1991 SI Owner!

Very first thing that showed up when doing a search:
90 91 Honda Prelude 2 0L Reman AC Compressor | eBay

you should know that the 88-89's used a different compressor than the 90-91's.
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Old 08-20-2015, 11:00 PM
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Re: 1991 SI Owner!

For replacement parts, the best site for us is RockAuto Parts Catalog
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Old 09-06-2015, 09:31 PM
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Re: 1991 SI Owner!

Update:

I decided to can fixing the AC for now, and removed the AC system besides the dash components.

New oil pan on the car, new battery, new radiator, hoses, thermostat. Still gotta work on the sensor issues, but I'm considering changing the fan out... I gotta think on stuff more.

Electrical gremlins are starting to pop up - car doesn't want to start so I'm taking off the starter later this week and getting a new one - no crank, nothing. Gremlins, gotta love 'em.

Thinking more about stuff I should do with it.

By the way, thanks for the tip on Rock Auto - never used them before but decent prices and excellent customer service.
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Old 09-09-2015, 11:25 AM
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Re: 1991 SI Owner!

For starter issue, check the rubber stopper on the clutch peddle. On my 89 lude, it was gone so it didn't depress the electrical switch on the clutch pedal which prevented it from starting.
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Old 09-09-2015, 02:32 PM
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Re: 1991 SI Owner!

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Originally Posted by thtran66 View Post
For starter issue, check the rubber stopper on the clutch peddle. On my 89 lude, it was gone so it didn't depress the electrical switch on the clutch pedal which prevented it from starting.
THIS^^^ The same thing caused mine to not start. Check out this thread I made on how to EASILY fix it:

3RD Gen Prelude Won't Crank

Pay attention to that nifty Pad insertion tool I made. I spent 30 minutes trying to snap that thing in and once I made this... 10 seconds, including climbing into the car upside down.
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Old 09-09-2015, 02:34 PM
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Re: 1991 SI Owner!

BTW... The Motormite / Dorman HELP! Part number you are looking for is: 74015 If you don't see it on the shelp at you local autoparts store, ask for it at the counter. Some of them keep those type things in the back... No room in the shelves in the front. I had better success with O'Reilly than I did with Autozone. Just FYI
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Old 09-09-2015, 06:36 PM
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Re: 1991 SI Owner!

It's an automatic, not a manual. I've confirmed. The starter is bad. Only issue is I can't find the second bolt to undo it. Whats its size and where is it in relation to the starter and transmission?
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Old 09-10-2015, 09:43 AM
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Re: 1991 SI Owner!

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Originally Posted by Kazuo View Post
It's an automatic, not a manual. I've confirmed. The starter is bad. Only issue is I can't find the second bolt to undo it. Whats its size and where is it in relation to the starter and transmission?
One in front of the starter, one behind the starter, they use the same size bolt heads.


Last edited by luda8890; 09-10-2015 at 09:54 AM.
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