New? Start here. There are 628 Volvo forum users online now. See the forum's active topics. Say hi contact Matthew.
MVS-Amazon link helps MVS!

Volvo Coolant Advice

volvo coolant

Our Forum members offer up sound advice relating to volvo coolant.

Volvo coolant is a fluid which flows through or around a device to prevent the device from overheating, transferring the heat produced by the device to other devices that either use or dissipate it. An ideal coolant has high thermal capacity, low viscosity, is low-cost, non-toxic, chemically inert, and neither causes nor promotes corrosion of the cooling system. Some applications also require the coolant to be an electrical insulator.

The coolant can either keep its phase and stay liquid or gaseous, or can undergo a phase transition, with the latent heat adding to the cooling efficiency. The latter, when used to achieve below-ambient temperature, is more commonly known as refrigerant.

MVS Forum Member Primo asks:

Okey I recently bought a used ’99 S70 non turbo and so far I’ve had to do some minor repairs here and there. Not had any major problems yet but just yesterday, the little red radiator looking light on the dash came on and and I thought it would go off by just topping of the tank with coolant. So I went to advanced auto and bought there 50/50 pre mix antifreeze/coolant and was told it wouldn’t hurt the car. But after topping off the coolant tank, the light is still on when I start the car and stays on. Is there any a way to reset it because, I just don’t feel to confortable driving aroung with the light on. Did I have to use volvo coolant? I have no idea when the coolant was flushed and I guess that’s probably what I need to do at this point anyway. Also,I was told by a mechanic today that it might be some kind of “coolant sensor” that has to be replaced 😕 anyone know what that is and it’s location??? And honestly, I don’t know the exact procedure for flushing the coolant on these volvos. Do I need to use volvo’s coolant or any other 50/50 coolant will do just fine for the price. The reason am asking is because I’ve read somehwere in the owner’s manual that only use volvo coolant but if I took my car to any repair shop, am pretty sure they would use something other than volvo antifreeze. Please advice me the way you see it fit and if it’s an easy DIY project would you also provide a step by step post or link. Thank you,
+ Primo!!!

MVS Forum Member White850Turbo replied:

The main thing that you want to look for on the coolant is that one of the main ingredients is ethylene glycol. As far as the coolant light goes, there is a coolant level sensor in the back underside of the overflow tank. Sometimes, that sensor can vibrate loose from it’s original position, causing the system to think that there is less coolant than there really is. Wiggle it around and see if you can get it to work. As for flushing the system, there is a little plastic petcock on the bottom of the radiator that should be used to drain coolant, but make sure that the system is not pressurized first (i.e. the cap is off of the overflow tank).

Coolant Advice


Peter Bannon says:

Make that “Check the reservoir level frequently NOW that it is heater on weather.”

Peter Bannon says:

Going through the same thing with my 1995 Volvo 850 Turbo Wagon. The problem is most likely a leak in the Heater core – inside the Climate Control box under the dash. They tend to develop leaks. Gave up on the leaking AC condenser in there awhile ago.

It is an expense job to replace. My shop suggested Blue Devil Sealant that you add to the Antifreeze reservoir. I just tried it and it completely gunked up the reservoir and I’m on my way outside to replace the gunked up thermostat.

What you must watch out for is that leak is also causing a loss of antifreeze you may see under the car when you are running with the heat on. I’ve been letting it run to get the sealant to work but when I took it out on the road it quickly red lined (overheated).

Check the reservoir level frequently not that it is heater on weather.

Priscilla Burk says:

I have steam coming into the car from the air conditioning vents that smells like coolant. Please advise.
Just started today.
I have a 1995 850.

Thank you.

Leave a Reply