8 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHHow hot is too hot???--coolant question
Reported or suspected cause
th $10 thermostat not opening all the way
Reported cause
No successful repair reported for this finding.
1
Identified cause
0
Suspected cause
0
Reported fixes
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 report identifying a cause
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.
Reported cause · Original poster
My old 968 did this and it turned out to be th $10 thermostat not opening all the way.
Leading evidence: 'th $10 thermostat not opening all the way' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'th $10 thermostat not opening all the way' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Run 3rd radiator' (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 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
I don't think it's all that necessary to run a 3rd radiator, but that's just me.
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
The only time my 99 did something like this the right front radiator fan was never going into high speed, it was running but only on low speed.
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
Lived without A/C for many miles until I figured out I could radically increase A/C efficiency, and thereby reduce the heat load to the engine water jacket cooling raidator, by going to max cool (used blower speed to regulate cabin comfort level) wherein A/C airflow REHEAT is completely OFF!
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
Lived without A/C for many miles until I figured out I could radically increase A/C efficiency, and thereby reduce the heat load to the engine water jacket cooling raidator, by going to max cool (used blower speed to regulate cabin comfort level) wherein A/C airflow REHEAT is completely OFF!
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.
8 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.
0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261026T103553Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hey there,
My 1999 c2 cab always used to stay between the "8" and the "0" on the guage.
Started now going to and staying mostly on the "0". I know most vehicles typically stay to the middle if not lower on the gauge. The "0" of definitely past the half way mark.
I cleared some small debris from the front radiators to no avail. I also have noticed the rear deck cooling fan is not kicking on (the front radiator fans do).
Does the rear deck fan blow hot air out or cool air in???? At what temp should it kick on??? The warning ( low coolant/no fan etc)light does not come on.
The outside temp is no hotter than ever before. Coolant is full.
Help..................
I have a 1999 C4 and my temp gauge is usually points just past the mid point and occaisionally well into the 0. I dont know if this is normal but the atlanta heat and the start and go traffic does not help the situation any.
Mark
Not sure how hot it gets up in Cincy but the 3rd radiator may be an option. I am rolling the dice right now in Vegas (it gets up there temp-wise) but I will be moving back east in 1-2 years so I am just careful monitoring it since I have no desire to install the 3rd rad kit.
On my old 99 C2, I had the same "problem". It is "normal" but shouldn't be happening.
Cleaning out the front damn won't do it.
That's why Porsche re-designed the front damn in 2001, to the wider scoop style, to "suck" more air into the rads - You live, you learn.
I live in a very hot place (right now it's currently 103 degrees), my car runs as you described and each Pcar I've owned has done the same thing. I don't think it's all that big a concern that you are running at around 190. As long as your two radiator fans are working, you should be fine. Once mine kick on, she goes back down. No worries. I don't think it's all that necessary to run a 3rd radiator, but that's just me. Just monitor it carefully. (I've seen a temp gauge go up to 215 on the track on a nice 107 degree day at Thill in Trygve's car...no worries, it went back down.)
I'm not sure at which temperature the rear fan kicks in, but it rarely does so.
Thanks for the responses...but why would it start getting hotter than it used to???
My old 968 did this and it turned out to be th $10 thermostat not opening all the way.
Any ideas????
My '99 used to do the same thing but even hotter, especially at the track. I added the third radiator and it helped but still went up by the zero. It prevented approaching the red area though.
I never heard my engine compartment fan come on. I still think there was something wrong with it but I never had it looked at.
The only time my 99 did something like this the right front radiator fan was never going into high speed, it was running but only on low speed. 100F+ in AR in a construction zone with the A/C on. Lived without A/C for many miles until I figured out I could radically increase A/C efficiency, and thereby reduce the heat load to the engine water jacket cooling raidator, by going to max cool (used blower speed to regulate cabin comfort level) wherein A/C airflow REHEAT is completely OFF!
This is a source reference. Confirm exact model applicability in the original material.
