Water Pump
Thread Starter
Intermediate
Joined: Jul 2011
Posts: 44
Likes: 0
Water Pump
Hi,
I've been chasing a high temperature problem with my LT1, 93, C4. I have replaced the radiator because it blew out. I have done multiple flushes, replaced all the hoses and pressure tested.
Lately, the dashboard temp gauge stays around half, most of the time. If it sits idling for more than a few minutes when it's hot, it will creep up almost all the way to the top of the gauge. It comes back down when I run the heater or begin driving.
I used to see a stream of water coming out of the side of the top tank when I had the cap off. Now I don't. In fact, when it's running I don't see any movement in the tank at all, which leads me to believe the water pump may not be circulating coolant.
I replaced the pump a few years ago but it has probably been more years than I remember. Should I see coolant moving when I take the cap off the tank? I really don't want to tear down the pump just to find out it's working fine.
Thanks in advance
I've been chasing a high temperature problem with my LT1, 93, C4. I have replaced the radiator because it blew out. I have done multiple flushes, replaced all the hoses and pressure tested.
Lately, the dashboard temp gauge stays around half, most of the time. If it sits idling for more than a few minutes when it's hot, it will creep up almost all the way to the top of the gauge. It comes back down when I run the heater or begin driving.
I used to see a stream of water coming out of the side of the top tank when I had the cap off. Now I don't. In fact, when it's running I don't see any movement in the tank at all, which leads me to believe the water pump may not be circulating coolant.
I replaced the pump a few years ago but it has probably been more years than I remember. Should I see coolant moving when I take the cap off the tank? I really don't want to tear down the pump just to find out it's working fine.
Thanks in advance
Le Mans Master
Joined: Jul 2004
Posts: 6,219
Likes: 696
From: Clifton Park, NY ............Clearwater, FL ... 85 Original Owner
Hi,
I've been chasing a high temperature problem with my LT1, 93, C4. I have replaced the radiator because it blew out. I have done multiple flushes, replaced all the hoses and pressure tested.
Lately, the dashboard temp gauge stays around half, most of the time. If it sits idling for more than a few minutes when it's hot, it will creep up almost all the way to the top of the gauge. It comes back down when I run the heater or begin driving.
I used to see a stream of water coming out of the side of the top tank when I had the cap off. Now I don't. In fact, when it's running I don't see any movement in the tank at all, which leads me to believe the water pump may not be circulating coolant.
I replaced the pump a few years ago but it has probably been more years than I remember. Should I see coolant moving when I take the cap off the tank? I really don't want to tear down the pump just to find out it's working fine.
Thanks in advance
I've been chasing a high temperature problem with my LT1, 93, C4. I have replaced the radiator because it blew out. I have done multiple flushes, replaced all the hoses and pressure tested.
Lately, the dashboard temp gauge stays around half, most of the time. If it sits idling for more than a few minutes when it's hot, it will creep up almost all the way to the top of the gauge. It comes back down when I run the heater or begin driving.
I used to see a stream of water coming out of the side of the top tank when I had the cap off. Now I don't. In fact, when it's running I don't see any movement in the tank at all, which leads me to believe the water pump may not be circulating coolant.
I replaced the pump a few years ago but it has probably been more years than I remember. Should I see coolant moving when I take the cap off the tank? I really don't want to tear down the pump just to find out it's working fine.
Thanks in advance
If your water pump wasn't working, your car would over heat vary fast.
Race Director
Joined: Feb 2003
Posts: 16,475
Likes: 270
From: Kingman AZ
Cruise-In VII Veteran
Cruise-In VIII
St. Jude Donor '06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16
Have you checked the coolant tank and checked the lines in and out are clear? When you did the coolant flush did you pull the knock sensors on the block and poke around the openings to clean out the scale so all the coolant came out?
Instructor
Joined: Aug 2016
Posts: 240
Likes: 51
From: Putnam County NY
Hi,
I've been chasing a high temperature problem with my LT1, 93, C4. I have replaced the radiator because it blew out. I have done multiple flushes, replaced all the hoses and pressure tested.
Lately, the dashboard temp gauge stays around half, most of the time. If it sits idling for more than a few minutes when it's hot, it will creep up almost all the way to the top of the gauge. It comes back down when I run the heater or begin driving.
I used to see a stream of water coming out of the side of the top tank when I had the cap off. Now I don't. In fact, when it's running I don't see any movement in the tank at all, which leads me to believe the water pump may not be circulating coolant.
I replaced the pump a few years ago but it has probably been more years than I remember. Should I see coolant moving when I take the cap off the tank? I really don't want to tear down the pump just to find out it's working fine.
Thanks in advance
I've been chasing a high temperature problem with my LT1, 93, C4. I have replaced the radiator because it blew out. I have done multiple flushes, replaced all the hoses and pressure tested.
Lately, the dashboard temp gauge stays around half, most of the time. If it sits idling for more than a few minutes when it's hot, it will creep up almost all the way to the top of the gauge. It comes back down when I run the heater or begin driving.
I used to see a stream of water coming out of the side of the top tank when I had the cap off. Now I don't. In fact, when it's running I don't see any movement in the tank at all, which leads me to believe the water pump may not be circulating coolant.
I replaced the pump a few years ago but it has probably been more years than I remember. Should I see coolant moving when I take the cap off the tank? I really don't want to tear down the pump just to find out it's working fine.
Thanks in advance
Drifting
Joined: Mar 2011
Posts: 1,693
Likes: 144
From: on Barnegat Bay Joisey
If the temp stays in the mid range when driving and warmed up you should be ok. When standing still the temp should rise to about 235-240 when the fans should turn on and bring the temp back down to mid range. It sounds like your fans aren't working if the heater brings it down.
