temperature gauge fluctuation
Thread Starter
|
New User
Joined: Jan 2003
Posts: 3
Likes: 0
temperature gauge fluctuation
need a little help. have a problem only when the heater is on. temperature gauge will rise to over 1/2 then fall rapidly to cool. this same cycle continues on an on. tried three thermostats, new gauge sender no help. justt changed lower raditor hose, no help. no loss of coolant, truck 96 explorer sport guage reads normal without the heater on. anyone have any clue what's wrong, suspect the water pump?
New User
Joined: Jan 2003
Posts: 11
Likes: 0
temperature gauge fluctuation
[updated:LAST EDITED ON 09-Jan-03 AT 02:49 PM (EST)]Have you connected a VOM to the sensor yet to see if it is fluctuating? Are you sure that you have filled the system with the heater on. The coolant level will change a little as all the pockets are filled. Run the truck, parked of course with the rad. cap off and watch the level. Good luck.
Thread Starter
|
New User
Joined: Jan 2003
Posts: 3
Likes: 0
temperature gauge fluctuation
Jim, thanks for the reply. have purged the system (several times) i'm sure there is no trapped air. as for the VOM, standing still the gauge reads fine with or without the heater on. problem is most noticeable while driving. drained the system yesterday, added fresh watrer and radiator flush. gauge did not fluctate as much this morning. a digital thermometer in the heat vent seems to read pretty steady, does not vary with the gauge. this is a tough one, others have indicated a water pump, possibly vanes have worn??
New User
Joined: Jan 2003
Posts: 11
Likes: 0
temperature gauge fluctuation
The blades would wear if the pump was cavatating for some period of time. So if you maintain good water level then air bubbles would be minimized and cavatation would be hard to achieve, Unless the suction side of the pump is obstructed. Hoses will collapse when they become limber, old worn and warm. Springs have been installed in some cases to minimize that collapsing. Keep trying I fought for a few months with mine, check the idle problem listed in the forum. Good luck.
Thread
Thread Starter
Forum
Replies
Last Post
Rchris57
Explorer, Sport Trac, Mountaineer & Aviator
1
Nov 29, 2004 03:25 PM
