Question about 1988 Volvo 780

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My 1988 volvo 780 bertone overheats and i dont know why

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Posted on Dec 12, 2009

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  • Master
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There are a couple of things that can cause this. Check your coolant level. Do this when the engine is cold. Add if the radiator is not full. Check all hoses on the radiator and system to see if they are not collapsing. Change them if nessesary. Check your thermostat to see if it is not stuck and replace it if nessesary. Get a problem code from AutoZone or such store for free if all you have checked does not take care of the problem. DO not drive the car hot. The engine will get too hot and will damage the engine.

Posted on Dec 09, 2009

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1 Answer

1988 Volvo 780 Bertone. What color wires should be going to the a/c blower motor? Currently someone has hot wired it with a red/gray constant and a black/blue ground and seems to have no power to the a/c...


I would purchase a shop manual with wiring diagram as the wiring was hot wired for a reason. Usually it meand something failed and was bypassed. You will need a diagram to sort it out.

Feb 25, 2015 | Volvo 780 Cars & Trucks

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I have a 1988 Volvo 780 and it won't start anymore..occasionally, it used to turn off randomly while driving, but would always start back up afterwards, now I can't get it to turn over. Not sure what...


Start with your battery connections and load test your battery. Then run a Fuel Pressure test, you may need to replace the in-tank fuel pump and filters.

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My 1991 780 Bertone Coupe has not been starting when left on the parking lot in the sun. I've replaced 2 starters this summer but it still keeps happening. My mechanic is stumped. The only comm


If the car is in a secure area, raise the hood to vent air from the engine compartment when you park.

The symptoms sound like Vapor lock or a bad coil. Check fuelpump pressure when it acts up again.

If this vehicle has an ignition Relay, or a Fuelpump Relay, they may be affected by heat. Replace those Relays.

I am thinking the starters failed because of extreme cranking usage. Next time you replace one, get a Lifetime gaurantee.

There can be a strenuous condition for a starter when the engine is overadvanced. GM had a problem with its Crankshaft sensors which kept the Cams overadvanced and it fried the starters when the Owners tried to start their motors. But this was not due to heat and occured on cold motors too.

I hope my solution is helpful. Please rate my solution.

Oct 08, 2012 | 1990 Volvo 780

1 Answer

1990 burton my overdrive not working and i change relay and overdrive switch 123 is fine help.


It sounds like the OD solenoid to me you can either replace it or use this bypass kit offered by IPD. Like the desciption for it says "How many times have you used the OD button on the shift lever to shift down for hills or while towing?"
http://www.ipdusa.com/products/4793/110397-automatic-over-drive-solenoid-bypass-kit
The "Bertone" is a great car. Keep it running and happy! Not many around.

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Sounds like a intercooler coupling or hose blew off. The shop or mechanic might not have tightened a clamp all the way. Check that out first before going into further troubleshooting.

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1 Answer

How to connect a aftermarket radio in 1988 volvo 780


Visit crutchfield.com. Thay have harness adapters for virtually everything. Used them many times myself and they're great to deal with.

Sep 20, 2010 | 1988 Volvo 780

1 Answer

Volvo 780 bertone. the brake lights are not working.


OK. Several ideas. The 760 is really a 740 with a fancy body. Start with the brake light switch on the brake pedal. Use a short jumper with two alligator clips to bypass the switch. If the brake light works, bingo! A good substitute for the jumper is a cheap 12 volt test light from AutoZone or Sears. Clip one end to a good ground, and probe for voltage with the sharp tip. If the bulb lights on one side of a switch, you have 12 volts coming in. If you activate the switch and there's not 12 volts on the other side, the switch is suspect. Check the fuse. The fuse functions are labelled on the iunside of the ash tray door. Check the @#$%^@# bulb sensor in the relay rack behind the ash tray. It's the big, round red relay in the rear left position closest to the firewall. Failure there can knock your brake lights out. A used one fetches about $10 on ebay. I always carry a spare. You didn't tell me if all the brake lights are out, or just one. If they're all out, it's a systemic problem. One out, it';s usually a bulp or bad socket.

Mar 16, 2010 | 1990 Volvo 780

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