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Unread 11-26-2010, 08:15 PM   #1
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Default Huge problems, speedo, dash lights, heater!!!

Alright guys, I have a few things I need help figuring out how to fix.
  1. My heater doesn't work properly, at all. It blows lukewarm air out the two vents in the dash. Nothing out the defog vents. My vents in my doors get nothing. And my vents below the dash blow COLD air. None of my buttons do ANYTHING on the dash. The only thing that does anything is the fan speed control.
  2. Speedometer still doesn't work correctly. I've replaced the speedo cable, and the speedo unit itself. I don't have the first clue as to what could be wrong at this point. I would assume the entire instrument cluster needs replaced at this point. For the record, it WORKS. But every once in a while my speedo just goes down to 0mph. I smack it, it comes back to life. It's not the cable, because my odometer still reads (ran off the same cable) when the speedo dies.
  3. My dash lights now fail to come on. They work when I use my "park" lights. But as soon as I switch the headlights on, the dash lights go out. I would imagine its probably a simple solder point that broke loose on the switch, but I really have no idea. Nor do I know how to get that switch out of my steering column. I was thinking worst case scenario, I could find the wire that goes to the lights, and wire a toggle for them.

Car is a 1987 Honda Prelude 2.0 SI (for those that don't know). I could really use some help on these problems, and I'm hoping I can tackle all 3 myself without professional aide. Anybody that can point me in the right direction, I would really appreciate it. These are all immediate problems that need fixed. The roads are icey (so I need my speedo and dash lights to work). And considering it gets to -10*F around here....I freeze my butt off for the first hour and a half I drive that car.

PS. Cross posted on OCN OT.

~pio
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Unread 11-26-2010, 08:18 PM   #2
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I'm not much of a Honda guy, but I had the first problem on my Regal, it ended up being the vacuum-controlled relay thing that controls the blend door. (Blend door actuator, I think?)
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Unread 11-26-2010, 08:24 PM   #3
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I'm not much of a Honda guy, but I had the first problem on my Regal, it ended up being the vacuum-controlled relay thing that controls the blend door. (Blend door actuator, I think?)
How does one go about fixing that? Teste mentioned something about that on Steam. I don't have any repair manuals for the car yet. So any details would be appreciated.
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Unread 11-26-2010, 08:35 PM   #4
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Well in the Regal it was easy...$180 new for the part, I got mine for $5 at a junkyard ("Ah aint never seen ona those before...you say it's a relay thang? Gimme five bucks and its yers") It sat behind the glove compartment, I just had to remove two screws and disconnect a few vacuum lines. Getting the glove compartment out was the only time-consuming part. It might be in a different location on your car, but it's a good place to start looking. I might still have the old part laying around in my garage, if I can find it I'll post a picture.
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Unread 11-26-2010, 08:38 PM   #5
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Quote:
Originally Posted by Gandalf View Post
Well in the Regal it was easy...$180 new for the part, I got mine for $5 at a junkyard ("Ah aint never seen ona those before...you say it's a relay thang? Gimme five bucks and its yers") It sat behind the glove compartment, I just had to remove two screws and disconnect a few vacuum lines. Getting the glove compartment out was the only time-consuming part. It might be in a different location on your car, but it's a good place to start looking. I might still have the old part laying around in my garage, if I can find it I'll post a picture.
A picture would definitely help me find it. I'm almost positive my heater system is behind the glovebox....and since I don't HAVE a glovebox, its relatively easy to get back there .
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  • Alpine 2x MRP-M650 (one per sub)/ MRP-T220
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Unread 11-26-2010, 09:10 PM   #6
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A picture would definitely help me find it. I'm almost positive my heater system is behind the glovebox....and since I don't HAVE a glovebox, its relatively easy to get back there .







Again this is on a Buick so it may or may not look the same but it should have similar features.
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Unread 11-27-2010, 03:08 AM   #7
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Sounds like everything in your dash may share a common ground that has a bad connection. The heating issue may be related if part of that is electronically controlled. Sometimes if you have a problem with the vacuum controlled ones it'll make the engine run funky on some settings because it'll have a vacuum leak.

Did you check to see if you're getting plenty of hot water to the heater core and you're not low on coolant?

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Unread 11-27-2010, 08:18 PM   #8
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Originally Posted by Felipe the Ant View Post
Sounds like everything in your dash may share a common ground that has a bad connection. The heating issue may be related if part of that is electronically controlled. Sometimes if you have a problem with the vacuum controlled ones it'll make the engine run funky on some settings because it'll have a vacuum leak.

Did you check to see if you're getting plenty of hot water to the heater core and you're not low on coolant?
I'm willing to bet this isn't electrically controlled other than the fan. I might be wrong, but I really don't think it is. Engine doesn't run funky on any settings, but when I turn the heater on at all....my engine does bog down at idle pretty bad.

I'm definitely not low on coolant. I JUST flushed the radiator, and put fresh coolant in like 2 days ago.

And I think I've seen something similar (to the picture above) under my dash. I'll have to check out when it gets a little bit warmer out so I can work on it without breaking a finger off from it being frozen, lol.
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  • 1987 Honda Prelude 2.0 SI
  • Dual Mechless Head Unit (yeah, its Dual )
  • Kicker KS5250 Door Speakers
  • Pioneer 1" Dome Tweeters (Door)
  • Pioneer Premier REV 6.5" Rear Speakers
  • Alpine 2x MRP-M650 (one per sub)/ MRP-T220
  • Big 3 with 2 Gauge

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Unread 11-27-2010, 08:22 PM   #9
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pio, remember, heater =/= fan. Turning the heater on should NOT bog down your engine at all, because that's just sending the coolant thru the heater core. Turning on the fan, however, will draw current and bog the motor a bit. Especially with your dinky little 4 banger.
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Unread 11-29-2010, 12:30 PM   #10
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Quote:
Originally Posted by pioneerisloud View Post
I'm definitely not low on coolant. I JUST flushed the radiator, and put fresh coolant in like 2 days ago.
Yeah so it was full 2 days ago, did you check it again?
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Originally Posted by wierdo124 View Post
pio, remember, heater =/= fan. Turning the heater on should NOT bog down your engine at all, because that's just sending the coolant thru the heater core. Turning on the fan, however, will draw current and bog the motor a bit. Especially with your dinky little 4 banger.
I've never had that happen, the only time it should do that is if you turn on the a/c or the defroster in some cars.

But pio, what exactly do you mean by turning on the heater? Which switch?

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