13 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHCooling fan problems
Leading reported evidence
Clean radiators
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that performed work without a confirmed outcome
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Leading evidence: 'Clean radiators' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Clean radiators' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that performed work without a confirmed outcome
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Performed · outcome unconfirmed · Original poster
we tested the low speed fan face by removing the relay which handles the low side and jumped them.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion
If you already replaced the ballasts and tested the fan motors, then whats left in the equation are the relays and wiring.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion · Original poster
while the temp is rising the low setting on either fan will not come on.
Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.
13 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
1 acknowledgements have no verified action link; they do not establish a repair result.
Outcome without a verified action link
Please help....track day next week need to get this resolved.
Hi guys.....i have a 2001 996. My radiator cooling fans are acting up. This is what happens: The temp goes past the 180 mark, actually almost creeps up to the next mark (which does not have a number) between the 180 and the 250 mark. only after its almost to that mark the passenger side fan will come on high only. the driver side does not come on. while the temp is rising the low setting on either fan will not come on.
Yesterday with the help of a friend mechanic we determined the the ballast resistor on the driver side fan is bad. We are pretty certain it is so we ordered one and will change it as soon as we get it. Now the low side resistor on the passenger side is good but the fan will not come on on low as the temp starts to rise. Is it possible the driver side being bad affects the operation of the passenger side low speed function???
Still even though we think the relays are good the high does not come on on the drivers side when the passenger side goes on. I did do some searching yesterday and what i found is that they both should go on at the same time at low or high.
I also have a 997 and the 997 will turn both on at low or high at the same time which it seems only logical that it would.
Going back to the 996....hope i explained myself and did not confuse any of you.
Please help....track day next week need to get this resolved. at this point i would have taken the car to the dealer but not available in my city of el paso texas
Did you check or try swapping the relays?
The mark between 180 and 250 is really very hot, you should not allow the car to get that hot under normal circumstances.
If you turn on your air con, do both low speed fans turn on? If they are working, they should be OK. The computer will activate them at the right temp.
You can test the high speed by removing the high speed relays (or maybe remove be low actually), the HS fans will click on and off every so often (but certainly put the relays back in when you are done).
Yes both fans should run at the same time, it's possible in addition to a bad ballast you have a bad fan motor, or wiring problem, but I would bet on a bad relay first.
no we did not swap relays. we thought about that later once i was home from the shop. but i ordered one just in case. from what i have read if the high is not going on it must be a relay you are right.
low speed: thats the biggest question. we tested the low speed fan face by removing the relay which handles the low side and jumped them. the one on the driver side would not go on. the one on the passenger did go on. indicating that the resistor on the driver is bad and the resistor on the passenger is good. we also said if the driver side in not going on on low it also could be a bad fan but tested the fan directly and it does operate. So according to our testing the bad resistor is only on the driver side, but there is always a but, neither side will turn on on low????????
If you turn on your A/C the low speed fans should come on regardless of coolant temp.
You can swap the high speed to low speed or L & R relays between each of the 4 fan relay positions, they are all the same relay IIRC.
If you already replaced the ballasts and tested the fan motors, then whats left in the equation are the relays and wiring.
Hello there,
I have been having some issues with temperature as well, my 99 c2 temperature reading stays in the 180 mark, the needle normally tends to travel to the right side of the "0" I have turned the AC on and both fans come on.
Is it a normal operating temperature? Could something else be the culprit of higher temperature readings?
While I'm on the highway the temperature always stays right on the middle of the "0" of the 180 mark, it seems like low speed, street driving that makes it stay on the warm side.
I recently cleaned my radiators.
Thank you for your help.
To the above poster, that sounds pretty normal to me and nothing to worry about.
Coolant needle straight up highway driving.
Not moving fast, street driving it will get hotter.
The right side of the 0 is nearing coolant temps of 100-105C and 110-115C oil temp. But that is still "within spec" so to speak. Should it run cooler, certainly can't hurt.
Your low and high speed fans should come on automatically once it reaches the appropriate temp.
Thanks Logray. I ran it pretty hard the other day and it most likely came on but went back off during some calmer highway driving on the way back. Is there any way to know when it comes on other than going back there and looking?
You could wire a simple 12v light into the fan circuit. Search for "fan hack" if you want to explore that.
Other than that, no there is not a way to tell.
This is a source reference. Confirm exact model applicability in the original material.
