Update your Radiator Cap! 2/7/9 series.

Post by **billofdurham** » 12 Jan 2009, 11:32

I agree with that and have changed the heading. I shall post a new pinned topic with those cars that do not take the later cap and work on a list for the FWD.

Bill.

RCR · Post by **RCR** » 12 Mar 2010, 12:25

Just had an issue with one of the green Caps bought bfrom my Volvo dealer. It was holding WAY too much pressure and I eventually had a thermostat come apart. If I had not had a slight leak at my heater control valve i would have likely seen the tank blown apart. I had noticed the tank balooning at times after installing the new cap and when we checked it it would not release preasure at all!

740_dan · Post by **740_dan** » 10 Mar 2011, 14:55

I've got a 740 B230FT 1986 - I don't see this year on list - Is "B230ET" a typo? Thanks!

Post by **billofdurham** » 10 Mar 2011, 15:33

Welcome to Matthew's Volvo Site.

It is not a typo. The B230ET was fitted to cars in Europe and elsewhere, but not in the US. It was an injected engine without a Lambda or catalytic converter.

My apologies, I missed the '86 740 B230FT from the list. It does take the 1.5 bar cap.

Bill.

740_dan · Post by **740_dan** » 10 Mar 2011, 15:48

Thanks so much! Very useful thread

madviktor · Post by **madviktor** » 11 Jun 2011, 14:09

How about the 1996 B200FT from a 945, with radiator and tank from a 1983 B19E ? what cap would be best here? not sure about the hoses, they might be the B200FT's ones..

hunterson · Post by **hunterson** » 08 Aug 2011, 18:49

I would definitely stick with the 75kpa rated reservoir cap. The green 150kpa can over pressure your system in the older volvos and give you exciting repair tree explorations.
My brief experiment with the high pressure cap led to failure of a three year old radiator at the reservoir hose junction. Which led to electric evaporator fan failure, which led to alternator failure.
My brick is a 1990 740GL wagon, non-turbo, with only 128K miles and has been aggressively maintained.

BerniniCaCO3 · Post by **BerniniCaCO3** » 12 Jan 2012, 15:48

A buddy with a crown vic went through 4 heater cores before he figured out it was the (wrong) new radiator cap he'd put on a year and a half ago!

I wanted to ask, in line with this thread: is vacuum another animal?
If you vacuum-fill your coolant, using 25-30lbs of vacuum, can that also do damage to a system rated for 16psi of pressure?

If you're not familiar with it; what you do is have a pneumatic vacuum "pump" (there is no pumping action; the escaping air draws the vacuum), to put a vacuum on the entire cooling system, and then open up a valve going to your coolant jug and the vacuum pulls coolant into the entire system. Works wonders if there's oddball plumbing that likes to trap air pockets.
Can any damage result though? I've wondered.

Update your Radiator Cap! 2/7/9 series.

Re: Update your Radiator Cap! 2/7/9 series.