97 4L Heating system leaking
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Freshman User
Joined: Feb 2008
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From: Killiney Beach, B.C.
97 4L Heating system leaking
In the engine bay of my son's truck the vacuum controller in the hoses running to the firewall is leaking again? He bought the truck 6 months ago and we noticed the coolant leaking around that (vacuum controller?) I replaced it. 1 month ago my son noticed the same device leaking so bought another one and put it in, he doesn't live near me so I can't get my hands dirty. Now the new part he put in is leaking? I think something is causing pressure to build up greater than it normally would and fluid is leaking past the vacuum actuator in the black plastic device? Sorry I don't know the proper name for that unit but it has a total of four lines running into and out of it! I also believe he has the heater door problem as well because when we first purchased the vehicle we noticed the heat is on all the time and is only not warm when heater control is turned Off. I don't think the door problem is related to the engine bay device? Any suggestions? Thanks, Mark
Fleet Mechanic
Joined: Feb 2007
Posts: 1,716
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From: Boston, MA
In the engine bay of my son's truck the vacuum controller in the hoses running to the firewall is leaking again? He bought the truck 6 months ago and we noticed the coolant leaking around that (vacuum controller?) I replaced it. 1 month ago my son noticed the same device leaking so bought another one and put it in, he doesn't live near me so I can't get my hands dirty. Now the new part he put in is leaking? I think something is causing pressure to build up greater than it normally would and fluid is leaking past the vacuum actuator in the black plastic device? Sorry I don't know the proper name for that unit but it has a total of four lines running into and out of it! I also believe he has the heater door problem as well because when we first purchased the vehicle we noticed the heat is on all the time and is only not warm when heater control is turned Off. I don't think the door problem is related to the engine bay device? Any suggestions? Thanks, Mark
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Freshman User
Joined: Feb 2008
Posts: 39
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From: Killiney Beach, B.C.
When I replaced the original part I reconnected the hoses one at a time. There were different diameters which also prevented incorrect connection. I will phone my son and get him to check for a vacuum and post that info. Also the fluid drip is green like the antifreeze I don't think it is something else?
Fleet Mechanic
Joined: Feb 2007
Posts: 1,716
Likes: 0
From: Boston, MA
When I replaced the original part I reconnected the hoses one at a time. There were different diameters which also prevented incorrect connection. I will phone my son and get him to check for a vacuum and post that info. Also the fluid drip is green like the antifreeze I don't think it is something else?
Elder User
Joined: Feb 2006
Posts: 681
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From: SE Michigan
Some of these plastic heater control valves just aren't made very well and fail often. You may need to go to a different store to get a better quality valve from a good national brand. Or you may need to get one from your local dealership for the best quality. If you had too much pressure in the system it would blow past the radiator cap and go into the overflow tank. The cap acts like a pressure relief valve is rated for a specific pressure range.
Fleet Mechanic
Joined: Feb 2007
Posts: 1,716
Likes: 0
From: Boston, MA
Some of these plastic heater control valves just aren't made very well and fail often. You may need to go to a different store to get a better quality valve from a good national brand. Or you may need to get one from your local dealership for the best quality. If you had too much pressure in the system it would blow past the radiator cap and go into the overflow tank. The cap acts like a pressure relief valve is rated for a specific pressure range.
