Hi all again,

Sorry for screaming, but I posted below message couple o days ago, no reply. Leak is getting worse. What to do? Will adding quick fix "radiator cement" agent to coolant via reservoir work for now? Or will this damage pump and should be avoided alltogether, and instead bite sour apple and let car sit until I have possibilities to get it fixed by shop? Or start on repair myself right now (for which there, of course is limited time just now). You see why I am in real need of good advise.

I have a coolant water leak (green water) into both drivers side (most) and pass side floors (little, seems to come outta or near air inlet from center console). Obviously something is leaking rearwards of fire wall, could be heater element itself or valves or tubes/hoses inside this ACC thing, which seems pretty complicated as judged from looking into FAQs. Please help me suggesting how to go about repair. Resort to a Volvo shop? Have myself changed fan, was PIA, but manageable, is this a little worse or much worse? Should I get some spare parts in advance, or can i take it half-way apart for diagnosis and then get parts, driving the thing (I love this car, but feelings right now a bit hurt). This is my much needed daily driver 945 ´93

Any drawings/pics much appreciated

Thanks in advance to all you helpful people out there.

Hi Gustaf,

It is likely that the heater core is leaking at the brass tubes, that protude through the firewall from the heater core into the engine bay. These tubes are attached to the heater core and are soldered for reinforcement. They are a weakness and can not be repaired without removal from under the dash. My 93 945 is awaiting repair for a leaking heater core, I'm sure I will find this to be the problem when I eventually dig it out.

The car can be made driveable by removing the heater hoses from the firewall and placing a metal tube inside the removed ends as a joiner to form a loop back into the engine. This bypasses the heater core therefore no coolant in the cabin. Use circular clamps to secure the hoses to the metal tube. You will have no heating apart from your seats. No problem in Australia at the moment as we are in summer.

FCP Groton have this core, which is common to all 740s, for $110.

Hope this is of some help.

John H from DOWNUNDER

Thanks for good advise! I still have a question though: in all non ACC heater systems there is a valve regulating how much fluid flows thru the heater core. I just wonder if there is such a thing in the ACC system and where that thing hides. In several of my previous cars it has been this guy being the culprit when leaks have ocurred from under dash. So I just wonder if there is such a valve here too and whether it sits just close to or inside the heater assembly box, and whether a leak from this guy would lead to same symptom as leak from heater core. Anyone knows?

HELP HELP, water coolant leak from ACC worse 900 1993
posted by kraut on Wed Feb 6 00:03 EST 2002
Author Info: [PROFILE] [EVERY POST] [THREADS]
There are no hoses or valves inside the cabin. The heater core tubes for the hose attachments go through the firewall. Replacement of the heater core is complicated and requires massive disassembly of the lower dash/center console area to access the cover panel for the heater core. I wouldn't attempt replacement without the VOLVO service manual. You can order at 1-800-25VOLVO or www.techinfo.com.

There are no hoses or valves inside the cabin. The heater core tubes for the hose attachments go through the firewall. Replacement of the heater core is complicated and requires massive disassembly of the lower dash/center console area to access the cover panel for the heater core. I wouldn't attempt replacement without the VOLVO service manual. You can order at 1-800-25VOLVO or www.techinfo.com.

The radiator leaks can be OK for temporarily fixing very small leaks.

But sounds to me like you got a bad heater core or hose or controller in the cabin that won't be helped much by stop leak. You'll need to poke around to find the cause......thank God it's not a 240, the core on your car isn't the worst to change but no car is a picnic when your are required to climb under the dash.

Sorry no pics, but since no one replied to your previous post I thought I'd help.

Well, when I changed the fan w motor it took me about 3 hours including figuring out how to dislodge computer box and get it all back in place, guess I could do same thing now in half that time or less. So, PLEASE you guys, give me some good advise. I figure I need to get at the ACC from drivers side, and expect o find tubings and valve in the left part of the heater assy box. But is there a lid to be pryed/screwed off, or do I need to cut the thing open? Do you guys think it could be a hose/valve thing (are these parts in the air stream thus allowing leaked coolant to get into air stream) or should I expect it to be the core?

Darn! The one thing I have not worked on yet.

Did you look in the FAQ's for info on the heater core? That, the hoses, and the valve are the only things it could be.