960 Radiator install?
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Joshabilly
960 Radiator install?
Is it neccessary to replace the thermostat when replacing the radiator in my '96 960? I'm a new Volvo owner, and an even newer DIY auto repair guy.
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Kmaniac in California USA
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Technically speaking, thermostat replacement is not a required step of radiator replacement. However, since you already have the cooling system drained for the radiator replacement, you may as well replace this item, as it is inexpensive to buy, easy to install, and can cause you major frustration should it fail with age.
Thermostats can last a long time, but will eventually fail over time. They have two failure modes. When they fail, they either don't open or open enough, or they don't close. When a thermostat fails to close, your car will appear to run fine, but the temperature gauge will not climb up to the normal range. Usually, the temperature gauge will stay close to C. If the thermostat fails to open, the reverse will happen. Your car will overheat quickly and eventually blow coolant out your overflow tank. Also, for a modern car such as yours, a correctly functioning thermostat is critical for proper engine operation. The computer controls that manage the fuel and ignition systems rely on coolant temperature inputs to function correctly.
My bottom line is that you take this opportunity to replace your thermostat.
Now for my two-cents worth about radiator replacement. You didn't mention why you were replacing the radiator and you also mentioned that you were new to DIY repairs.
The radiator should only be replaced if it has irrepairable leaks, such as pinhole leaks in the core or cracked plastic tanks, or if it can be proven that there are flow restrictions in the core. I assume that one of these is the case for your radiator. If not, please let me know.
The Volvos of this era were equipped with radiators with metal cores and plastic side tanks. These units are lightweight, but cannot be repaired should they leak. They are also prone to a sudden failure mode where the radiator hose nipple breaks off the radiator tank. Not a good thing to have happen when you are driving down the expressway.
There are after market manufacturers that produce all-metal radiators for these cars. When replacing a radiator in a Volvo, I strongly suggest getting an all-metal replacement. That way, should they leak in the future, they can be repaired. Also, the hose nipples won't break off.
A couple more things to consider. I would strongly suggest replacing your radiator hoses during the radiator replacement process, especially if you don't know how old they are or they look deteriorated. I would also inspect the water pump as well, as it is easier to replace this part, too, when the radiator is out and the cooling system drained. Also, used coolant is a hazardous waste and should be collected and disposed of properly. Replace with new antifreeze, using a 50-50 mix of antifreeze with water.
Thermostats can last a long time, but will eventually fail over time. They have two failure modes. When they fail, they either don't open or open enough, or they don't close. When a thermostat fails to close, your car will appear to run fine, but the temperature gauge will not climb up to the normal range. Usually, the temperature gauge will stay close to C. If the thermostat fails to open, the reverse will happen. Your car will overheat quickly and eventually blow coolant out your overflow tank. Also, for a modern car such as yours, a correctly functioning thermostat is critical for proper engine operation. The computer controls that manage the fuel and ignition systems rely on coolant temperature inputs to function correctly.
My bottom line is that you take this opportunity to replace your thermostat.
Now for my two-cents worth about radiator replacement. You didn't mention why you were replacing the radiator and you also mentioned that you were new to DIY repairs.
The radiator should only be replaced if it has irrepairable leaks, such as pinhole leaks in the core or cracked plastic tanks, or if it can be proven that there are flow restrictions in the core. I assume that one of these is the case for your radiator. If not, please let me know.
The Volvos of this era were equipped with radiators with metal cores and plastic side tanks. These units are lightweight, but cannot be repaired should they leak. They are also prone to a sudden failure mode where the radiator hose nipple breaks off the radiator tank. Not a good thing to have happen when you are driving down the expressway.
There are after market manufacturers that produce all-metal radiators for these cars. When replacing a radiator in a Volvo, I strongly suggest getting an all-metal replacement. That way, should they leak in the future, they can be repaired. Also, the hose nipples won't break off.
A couple more things to consider. I would strongly suggest replacing your radiator hoses during the radiator replacement process, especially if you don't know how old they are or they look deteriorated. I would also inspect the water pump as well, as it is easier to replace this part, too, when the radiator is out and the cooling system drained. Also, used coolant is a hazardous waste and should be collected and disposed of properly. Replace with new antifreeze, using a 50-50 mix of antifreeze with water.
Chris the "K MANIAC"
1986 740 GLE
(5) 1964 Chrysler 300-K's
1986 740 GLE
(5) 1964 Chrysler 300-K's
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