Cooling fan question.........
Cooling fan question......... Sick of searching and not finding anything.
Who knows what the coolant temp needs to be at for the fans to stay "on" after the engine is shut down and the key is removed?
What does it mean when the A/C is "off"........the fans DO NOT continue to run with the engine "off" , key turned forward to the "on" position....but if you start it the fans come on.....
Also, how many fan relays are there? Just the ones in the under hood fuse boxes?
.
Who knows what the coolant temp needs to be at for the fans to stay "on" after the engine is shut down and the key is removed?
What does it mean when the A/C is "off"........the fans DO NOT continue to run with the engine "off" , key turned forward to the "on" position....but if you start it the fans come on.....
Also, how many fan relays are there? Just the ones in the under hood fuse boxes?
.
I think my t-stat is stuck than.......I ran really hot yesterday for the first time ever. Just 10 miles, 7 of which were highway. Strange.
I thought if temps were too high, the fans kept running.
I'll check t-stat tomorrow. Thanks.
.
I thought if temps were too high, the fans kept running.
I'll check t-stat tomorrow. Thanks.
.
The fans were both running on HIGH when I got to my friends house....engine idling.......but the temps were jacked up higher than I've ever seen them. Especially highway cruising.
.
Well get the cooling system in order than if the fan where working overtime & the gauge was up has to be a problem.
The relays are not bad you can prolly get delco replacements for 20 max a piece....
Never really trust a coolant gauge on the 99's & up to be spot on accurate.
Dont overlook the coolant temp sensor also as an issue IF all else checks out well.
The relays are not bad you can prolly get delco replacements for 20 max a piece....
Never really trust a coolant gauge on the 99's & up to be spot on accurate.
Dont overlook the coolant temp sensor also as an issue IF all else checks out well.
Trending Topics
The PCM commands low speed fans on under the following conditions:
Engine coolant temperature exceeds approximately 108°C (226°F).
When A/C is requested and the ambient temperature is greater than 10°C (50°F).
A/C refrigerant pressure exceeds 1482 kPa (215 psi).
After the vehicle is shut off if the engine coolant temperature at key-off is greater than 113°C (235°F) and system voltage is more than 12 volts. The fans will stay on for approximately 150 seconds.
The PCM commands High Speed Fans on under the following conditions:
Engine coolant temperature reaches 112°C (234°F).
A/C refrigerant pressure exceeds 1710 kPa (248 psi).
When certain DTCs set.
Engine coolant temperature exceeds approximately 108°C (226°F).
When A/C is requested and the ambient temperature is greater than 10°C (50°F).
A/C refrigerant pressure exceeds 1482 kPa (215 psi).
After the vehicle is shut off if the engine coolant temperature at key-off is greater than 113°C (235°F) and system voltage is more than 12 volts. The fans will stay on for approximately 150 seconds.
The PCM commands High Speed Fans on under the following conditions:
Engine coolant temperature reaches 112°C (234°F).
A/C refrigerant pressure exceeds 1710 kPa (248 psi).
When certain DTCs set.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?
Pouria Savadkouei
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
TECH Enthusiast
Joined: Feb 2005
Posts: 734
Likes: 0
From: south jersey. again
there is a write up here about the power steering cooler leaking, maybe that would help. j/k you could try running a manual switch to the fans, ive done that on my street strip cars, if i remember you still use the relays the switch just bypasses it.
was it overheating while driving or sitting idle in traffic?
was it overheating while driving or sitting idle in traffic?
Thanks for the info...........I'll check it all. I guess if my fans stayed off after I took the key out...it was less than 235*F.
I'm gonna do a flush and check the t-stat.
I know our gauges are not accurate and should just be used as a guide day-to-day....but it was showing 60 degrees higher than usual.......and when i popped the hood, things were friggin hot. I can always keep my hand on the intake no problem......not this time.
I'm gonna do a flush and check the t-stat.
I know our gauges are not accurate and should just be used as a guide day-to-day....but it was showing 60 degrees higher than usual.......and when i popped the hood, things were friggin hot. I can always keep my hand on the intake no problem......not this time.
there is a write up here about the power steering cooler leaking, maybe that would help. j/k you could try running a manual switch to the fans, ive done that on my street strip cars, if i remember you still use the relays the switch just bypasses it.
was it overheating while driving or sitting idle in traffic?
was it overheating while driving or sitting idle in traffic?
Normally, my temp gauge would be about 60*F less than that for that trip, which I do 3-4 times a week. Something is wrong.......when I popped the hood, the engine bay was VERY hot. I know my car very well and it was really hot....for real.
Hope the t-stat is just going bad............because the fans were cranking on HIGH when I popped the hood at my friends house, while the engine was idling.
.
TECH Enthusiast
Joined: Feb 2005
Posts: 734
Likes: 0
From: south jersey. again
I drove about 2 miles to a highway, got on and did 75mph for about 7 miles, then 1 mile to my friends house. Usually it gets up to about 180*F (on the gauge), this time it was at the 240*F mark. My temp gauge NEVER in 13 1/2 years has even gotten close to even the 225*F mark.
Normally, my temp gauge would be about 60*F less than that for that trip, which I do 3-4 times a week. Something is wrong.......when I popped the hood, the engine bay was VERY hot. I know my car very well and it was really hot....for real.
Hope the t-stat is just going bad............because the fans were cranking on HIGH when I popped the hood at my friends house, while the engine was idling.
.
Normally, my temp gauge would be about 60*F less than that for that trip, which I do 3-4 times a week. Something is wrong.......when I popped the hood, the engine bay was VERY hot. I know my car very well and it was really hot....for real.
Hope the t-stat is just going bad............because the fans were cranking on HIGH when I popped the hood at my friends house, while the engine was idling.
.
It got hot just driving 3 miles to the bank and then about 3 miles over to Advance Auto. When I got out at Advance Auto the needle was just under my 215*F mark on the temp gauge....but the engine bay was HOT.....
Fans were both running on HIGH. When I turned the engine off the fans stopped. So I guess I was under 235*F.
Gonna flush it tonight and check the t-stat in a pot of water.......coolant is really clean though....so it might be the t-stat sticking partially opened.
Thanks.
.
TECH Enthusiast
Joined: Feb 2005
Posts: 734
Likes: 0
From: south jersey. again
I just went for a drive. Before I did I checked for anything stuck up in front of the condensor.
It got hot just driving 3 miles to the bank and then about 3 miles over to Advance Auto. When I got out at Advance Auto the needle was just under my 215*F mark on the temp gauge....but the engine bay was HOT.....
Fans were both running on HIGH. When I turned the engine off the fans stopped. So I guess I was under 235*F.
Gonna flush it tonight and check the t-stat in a pot of water.......coolant is really clean though....so it might be the t-stat sticking partially opened.
Thanks.
.
It got hot just driving 3 miles to the bank and then about 3 miles over to Advance Auto. When I got out at Advance Auto the needle was just under my 215*F mark on the temp gauge....but the engine bay was HOT.....
Fans were both running on HIGH. When I turned the engine off the fans stopped. So I guess I was under 235*F.
Gonna flush it tonight and check the t-stat in a pot of water.......coolant is really clean though....so it might be the t-stat sticking partially opened.
Thanks.
.
Gonna try to mess with it tomorrow.
I'll start with a flush cause its due anyway. I always take the t-stat out for the flush so coolant continually flows so it doesn't take so long waiting for the t-stat to keep opening and closing. I'll check the t-stat while its out.
If the pump wasn't working I wouldn't last 10 minutes of driving, needle would be in the red fast. Coolant is topped off and doesn't leak a drop. Its a strange one, since I've never had any kind of overheating issue in 13+ years down here in this hot *** place.
I'm thinking sticking t-stat. Its 9+ years old.
.
