thumping
New User
Joined: Nov 2002
Posts: 7
Likes: 0
thumping
I have a 1990 Ford Ranger 4.0L, 4wd, fuel injection with auto transmission. The heater hoses/ system makes a thumping noise. After the truck has warmed up there is a series of thumping noises under the hood by the heater. When I open the hood I can feel the water pulsing in the heater hoses, and the hoses seem inflated or firmer. The temperature gauge reads low - so the truck does not appear to be hot. and it does not do it all the time, It is random. The overflow bottle does not appear to have gas in it and the truck is not losing coolant. I notice it most when the truck is stopped or idling because there is too much road noise any other time. It will continue to make the noise after the truck has stopped.
The truck just recently had a blown head gasket, which was replaced. The thermostat has been replaced twice, 1st time was when the head gasket was replaced and the 2nd time was when I started hearing the thumping.
My mechanic is baffled - He says it is an open system and he dosen't know what is happening. Can you guys help??
Thanks
gja7
The truck just recently had a blown head gasket, which was replaced. The thermostat has been replaced twice, 1st time was when the head gasket was replaced and the 2nd time was when I started hearing the thumping.
My mechanic is baffled - He says it is an open system and he dosen't know what is happening. Can you guys help??
Thanks
gja7
Senior User
Joined: Jul 2002
Posts: 134
Likes: 0
From: NJ USA
thumping
I'll assume that your having a mechanic involved means you've ruled out the obvious causes (head gasket leak, etc.) and have no coolant in the oil or exhaust gases in the coolant.
IF THIS IS THE CASE, then read-up on the thumping phenomenon that affects the 3.0L engine by reading some past threads. Go to Search, enter "cooling system thump" (no quotes) and use the AND logic (all the words included). You'll see 4 threads; read them all. You may find you have the same mysterious steam formation problem as some of us 3.0L owners.
I'm sure that some of the experienced posters in this forum will confirm or deny if the 4.0L is subject to this problem as well, but I'm not aware of its status in this regard.
Good luck!
IF THIS IS THE CASE, then read-up on the thumping phenomenon that affects the 3.0L engine by reading some past threads. Go to Search, enter "cooling system thump" (no quotes) and use the AND logic (all the words included). You'll see 4 threads; read them all. You may find you have the same mysterious steam formation problem as some of us 3.0L owners.
I'm sure that some of the experienced posters in this forum will confirm or deny if the 4.0L is subject to this problem as well, but I'm not aware of its status in this regard.
Good luck!
