Volvo RWD 200 Forum

INDEX FOR 10/2025(CURRENT) INDEX FOR 2/2010 200 INDEX

[<<]  [>>]


THREADED THREADED EXPANDED FLAT PRINT ALL
MESSAGES IN THIS THREAD




  REPLY TO THIS MESSAGE    PRINT   SAVE 

temp sensor in rad hose: upper or lower? 200

posted by  someone claiming to be Brickhead on  Sun Mar 23 08:15 CST 2008 [RELATED]

I got a temp sensor adaptor for the water temperature that you splice into the radiator hose. This lets you run an auxilliary guage for the dashboard. My question is should I put the sensor in the lower or the upper radiator hose?

(To my knowledge; the upper hose will reflect temps after the cooling effect of the radiator, and the lower hose will reflect temps that indicate temperatures after it has circulated in the hot engine.)








  •   REPLY TO THIS MESSAGE    PRINT   SAVE 

    temp sensor in rad hose: upper or lower? 200

    posted by  someone claiming to be Brickhead on  Sun Mar 23 10:18 CST 2008 [RELATED]

    Ah yes yes ofcourse! So where would you suggest reading the temperature; which is more crucial in your opinion?







    •   REPLY TO THIS MESSAGE Replies to this message will be emailed.    PRINT   SAVE 

      temp sensor in rad hose: upper or lower? 200

      uid 34776's pic
      posted by  Ryan_R on  Sun Mar 23 11:47 CST 2008
      Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
      last visit: Tue Sep 24 13:46 CST 2013
      [RELATED]



      Upper would be better.... because that would be the closer to engine temp of the two, but the upper hose isn't necessarily loaded with coolant, so you might get some funky info, and likely no useful info until the engine is fully warmed up.

      Really the best measure for coolant temp, is to simply yank out the compensation board in the cluster, which will then liberate the stock gauge so it can give proper, real readings.

      Good luck!
      -Ryan
      --

      Athens, Ohio
      1987 245 DL 314k, Dog-mobile
      1990 245 DL 134k M47, E-codes, GT Sway Bars
      1991 745 GL 300k, Regina, 23/21mm Turbo Sway Bars
      Buckeye Volvo Club








      •   REPLY TO THIS MESSAGE    PRINT   SAVE 

        bypass, and which hose to use 200

        uid 25912's pic
        posted by  Sven's Maintainer on  Sun Mar 23 12:31 CST 2008
        Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
        last visit: Sun Sep 16 20:44 CST 2012
        [RELATED]

        I think Ryan has it right.

        Most importantly, if your original gauge is reading whacko and your 240 is '86 or later, you should do a temperature compensator board bypass. 99 percent of the time this will set things straight. You'll need about an hour, a screwdriver or two, a soldering iron, and a few inches of wire. Do some searches here or on google (site: brickboard.com) to find the procedure.

        Lower hose water has been cooled by rad.
        Upper hose - as previously pointed out - has hot water from engine HOWEVER this is only after it's warmed up and the thermostat has opened. Till then it reads the water that's been sitting in the hose since last shutdown.
        --
        Sven: '89 245 NA, 951 ECU, expanded air dam, forward belly pan reaches oem belly pan, airbox heater upgraded, E-fan, 205/65-15 at 50 psi, IPD sways, no a/c-p/s belt, E-Codes, amber front corner reflectors, aero front face, quad horns, tach, small clock.








  •   REPLY TO THIS MESSAGE Replies to this message will be emailed.    PRINT   SAVE 

    You've got it backwards .... 200

    posted by  Ken C on  Sun Mar 23 09:33 CST 2008
    Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
    last visit: Fri Oct 24 11:39 CST 2014
    [RELATED]

    Brickhead wrote: "...To my knowledge; the upper hose will reflect temps after the cooling effect of the radiator, and the lower hose will reflect temps that indicate temperatures after it has circulated in the hot engine...."

    My response: You've got it backwards. The hotter water directly from(!) the engine (by way of the thermostat housing) enters the radiator through the upper/drivers side hose; the cooled water from the radiator returns to the engine (by way of the water pump) through the lower/passenger side hose.







  •   REPLY TO THIS MESSAGE    PRINT   SAVE 

    temp sensor in rad hose: upper or lower? 200

    posted by  Claes on  Sun Mar 23 09:04 CST 2008
    Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
    last visit: Fri Oct 30 08:08 CST 2009
    [RELATED]

    it`s the other way around, hot water go from the engine to the radiator via the upper hose from the thermostat housing.
    --
    V70 2,5T -98







<< < > >>



©Jarrod Stenberg 1997-2022. All material except where indicated.


All participants agree to these terms.

Brickboard.com is not affiliated with nor sponsored by AB Volvo, Volvo Car Corporation, Volvo Cars of North America, Inc. or Ford Motor Company. Brickboard.com is a Volvo owner/enthusiast site, similar to a club, and does not intend to pose as an official Volvo site. The official Volvo site can be found here.