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  #1  
Old 08-10-2003, 11:33 AM
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Angry OVP Problem Perhaps?

Here are the symptoms - driving along with a/c on and the blower and a/c would just quit and start emitting hot air with the red LED light blinking in the Recirculation Switch! (I just ordered a new ovp relay just in case.) It has done this several times and I would pull over and shut down the engine for a few minutes and every thing returned to normal. Weird Hey! Could this be another relay that is going bad and I am missing?
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59 Ranchero
83 928 Euro S
84 928 Euro S
87 300D Turbo-Frybrid "WVO, Tastes Great - Less Filling"
90 750 IL
91 560 SEL
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  #2  
Old 08-10-2003, 02:01 PM
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Check your climate control fuse for corrosion!

OVP only protects the engine electronics and ABS, not the climate control.

Peter
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  #3  
Old 08-10-2003, 03:03 PM
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OVP

Thanks Peter, I will check the climate control fuse for corrosion. My engine died the other night after the on-off sympton with the recirc fan light, so I ordered a fuel pump relay and OVP relay and should have them in a few days.
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59 Ranchero
83 928 Euro S
84 928 Euro S
87 300D Turbo-Frybrid "WVO, Tastes Great - Less Filling"
90 750 IL
91 560 SEL
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  #4  
Old 08-10-2003, 04:27 PM
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Bad OVP will cause intermittant stalling due to idle control valve failure and fuel mixture funnys.

Bad fuel pump relay (duh!) will cause serious fuel starvation.....

That reminds me, I need a new fuel filter for the 300TE.

Peter
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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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  #5  
Old 08-10-2003, 05:24 PM
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OVP's effect on the engine depends on the type of fuel injection system fitted. However the give away is that if it fails it will always bring up the ABS light. certainly has nothing to do with climate control or A/C.

gmaltz, how is the engine temperature - on some models the a/c shuts down if engine gets too hot (over 120 degrees)
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  #6  
Old 08-10-2003, 09:05 PM
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OVP

Mick J. - My engine temp was normal before the car quit, so I think I have two unrelated problems. One being the fuel pump relay and the other climate control. Since the climate control was cutting out and I could always reset it after shutdown, I am thinking its a relay that cools down and resets itself. Which one I am not sure.

I have jumped the fuel pump relay and the pumps work, however, the engine still does not start and thats why I'm thinking OVP.

I removed the OVP and the fuses are OK but the thing rattles inside when it is shaken. Is that normal?
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Gerry

59 Ranchero
83 928 Euro S
84 928 Euro S
87 300D Turbo-Frybrid "WVO, Tastes Great - Less Filling"
90 750 IL
91 560 SEL
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  #7  
Old 08-10-2003, 10:35 PM
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The contacts or the circuit board connections in the OVP have broken off, it's shot.

Peter
__________________
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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  #8  
Old 08-11-2003, 09:07 AM
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I just removed the OVP again and opened it up to see what was making the ratteling noise inside, and guess what it was? A plastic card that covers the underside of the circuit board! This is completely normal because the card is not mounted or glued in there. It just sits there and is free to move a little bit, so the ratteling noise is NORMAL.

However, after inspecting the circuit board a little closer, it apears to have a few sodder problems at the connections. The new relay should arrive today hopefully.

On the next post-Check out the corrosion from dampness getting inside. This relay did not have a silicon seal around the case like some other relays had that I had pryed open.
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Gerry

59 Ranchero
83 928 Euro S
84 928 Euro S
87 300D Turbo-Frybrid "WVO, Tastes Great - Less Filling"
90 750 IL
91 560 SEL

Last edited by gmaltz; 08-11-2003 at 09:52 AM.
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  #9  
Old 08-11-2003, 09:42 AM
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http://www.momentoffame.com/snapshot.html?id=47830
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Gerry

59 Ranchero
83 928 Euro S
84 928 Euro S
87 300D Turbo-Frybrid "WVO, Tastes Great - Less Filling"
90 750 IL
91 560 SEL

Last edited by gmaltz; 08-11-2003 at 09:49 AM.
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