Good news -- I was able to successfully bypass the heater control valve by installing a piece of 5/8" plastic tubing between both hoses. No leaks (yet), and engine seems to be operating at normal temperature. However, I do have one question. What should I do with the small vacuum line? Should I...

93Regina, thanks for explaining the bypass process simply. This had crossed my mind, as it seems like not only the cheapest, but also the easiest solution. My setup is such as that there is one hose coming from the engine block (which is now capped), to the heater control valve, and then one hose fr...

Hello, 1995 Volvo 940 Sedan (non-Turbo) 142,000 miles. I was idling in traffic today when I see white steam expelling from under the hood. The engine was not overheating, although the cooling fan was engaged. I quickly pulled over for further inspection. Turns out the nipple of the heater control va...

You need to check the radiator spigot to which the radiator hose is attached to for cracks. If cracks exist the coolant cannot expand and push coolant back to the coolant reservoir as the system is unsealed. As you have witnessed a leak at the spigot/hose connection that is your starting point to r...

One thing I did not mention is that the coolant seems to never return to the expansion tank when the engine is cold. My guess is that this has to do with a leak in the vacuum of the cooling system. But I can't be too sure. I am also wondering if there could be air trapped in the cooling system? Or i...

I just replaced the upper radiator hose and clamps, but I am still getting "steam" and drips from where the hose meets the radiator. I am now even more confused...

Okay, so I just went for a quick 15 minute drive. When I parked, I noticed coolant dripping from the upper radiator hose where it meets the radiator, and could hear bubbling. This confirms my theory that the radiator is fully functional. Now, what would cause coolant to seep from the end of the hose...

Just checked coolant reservoir... It's at the minimum mark. Am I looking at a radiator issue?

Purchased this car used about 2 weeks ago. The coolant appeared to be very low at the time of purchase, but I didn't notice at first until overheating occurred at high RPMs. When I went to top off coolant, I noticed it was boiling. The overheating issue was solved when I added 1 gallon of coolant. T...