11 replies to this topic

[Richard e]

Hello

Has anyone experience of fitting GWP134EVO which is the ‘super water pump’ by minispares. I am getting overheating on stage 1 998 (1985) - fine on high speed run but when slowing in traffic temperature climbs and is boiling over. Water pump might be weak (have flushed and new radiator and heater matrix) - as this pump is fairly cheap I thought I would give it a go. Should I match to an alloy or better radiator? Or am I going to finish up overcooling it? Ta muchly.

[mini13]

dont over look the obvious like excecivly lean mixture or air leak, loose fan belt, or oversize pulley fitted, leaky rad cap not holding pressure.

[cooperd70]

I've fitted a 134Evo (with by-pass hose take off) on a 988 with modified head with no issues.

[Steve220]

I'd be looking at making sure the rest of the system is running properly first. Thermostat, fan correctly oriented, system flushed properly, etc. My van has a 998 and has struggled on the hotter days (30C+) but has never boiled over. When I first got it, i did a full flush (rad out, pipes off, back purged the block) and the amount of silt that come out was shocking.

[Richard e]

Done all that including calcium, lime, rust flush - runs clean. Timing checked - runs sweet. Thermostat checked, hoses good, radiator cap correct and changed. Fan correct and right way round. Water pump (and radiator and heater matrix are new), but I heard that rubbish water pumps could be the issue - and it is the next cheapest thing to change (hence whether I should upgrade)). The engine was idle for 20 years but after head off checks all works - no obvious blockages in the block. But something ain’t right - only gets hot after higher speed run then down to a idle or in stop start traffic. Blows hot through heater.

[Lplus]

Hello

Has anyone experience of fitting GWP134EVO which is the ‘super water pump’ by minispares. I am getting overheating on stage 1 998 (1985) - fine on high speed run but when slowing in traffic temperature climbs and is boiling over. Water pump might be weak (have flushed and new radiator and heater matrix) - as this pump is fairly cheap I thought I would give it a go. Should I match to an alloy or better radiator? Or am I going to finish up overcooling it? Ta muchly.

Looks like the EVO pump is the only one minispares do for engines newer than the original 848/997, so should be fine.  Since you did a flush and replaced the rad and matrix, I'd put one of those pumps in and try it.  If that pump plus the rest of the things you did won't cool a st 1 998 then you have problems somewhere other than the cooling system.

[andyapanel]

Its great-put it on my 998 last year.

The only drama was at the counter when they gave me one with no bypass.

[DeadSquare]

Done all that including calcium, lime, rust flush - runs clean. Timing checked - runs sweet. Thermostat checked, hoses good, radiator cap correct and changed. Fan correct and right way round. Water pump (and radiator and heater matrix are new), but I heard that rubbish water pumps could be the issue - and it is the next cheapest thing to change (hence whether I should upgrade)). The engine was idle for 20 years but after head off checks all works - no obvious blockages in the block. But something ain’t right -

 

 

 

"only gets hot after higher speed run then down to a idle or in stop start traffic. Blows hot through heater."

 

 

With the price of fuel these days, you won't be doing many high speed runs.  ...............  PROBLEM  SOLVED.

 

[Richard e]

It’s all relative… Thanjs for the responses. I’ll fit the super pump and see if that over powers what is probably a restriction somewhere. And focus on pootling.

[Midas Mk1]

Ive had a few fail, one had a hairline crack in before being torqued to spec, won't use again. 

Recommend the med one, or genuine unipart ones. 

[ac427]

It’s all relative… Thanjs for the responses. I’ll fit the super pump and see if that over powers what is probably a restriction somewhere. And focus on pootling.

Which product did you use for the cooling system flush to get rid of the calcium deposits?

Edited by ac427, 08 September 2022 - 11:34 PM.

[Richard e]

Calcium lime and rust remover - Zep from screwfix